diff --git a/.clang-tidy b/.clang-tidy
new file mode 100644
index 000000000..5143187d0
--- /dev/null
+++ b/.clang-tidy
@@ -0,0 +1,82 @@
+Checks: >
+  bugprone-*,
+  cert-*,
+  concurrency-*,
+  cppcoreguidelines-*,
+  misc-*,
+  modernize-*,
+  performance-*,
+  portability-*,
+  readability-*,
+  -# not applicable at all,
+  -bugprone-easily-swappable-parameters,
+  -bugprone-implicit-widening-of-multiplication-result,
+  -bugprone-macro-parentheses,
+  -cppcoreguidelines-avoid-c-arrays,
+  -cppcoreguidelines-avoid-magic-numbers,
+  -cppcoreguidelines-avoid-non-const-global-variables,
+  -cppcoreguidelines-macro-usage,
+  -cppcoreguidelines-non-private-member-variables-in-classes,
+  -cppcoreguidelines-owning-memory,
+  -cppcoreguidelines-pro-bounds-array-to-pointer-decay,
+  -cppcoreguidelines-pro-bounds-constant-array-index,
+  -cppcoreguidelines-pro-bounds-pointer-arithmetic,
+  -cppcoreguidelines-pro-type-const-cast,
+  -cppcoreguidelines-pro-type-reinterpret-cast,
+  -cppcoreguidelines-pro-type-union-access,
+  -cppcoreguidelines-pro-type-vararg,
+  -cppcoreguidelines-special-member-functions,
+  -cppcoreguidelines-virtual-class-destructor,
+  -misc-no-recursion,
+  -misc-non-private-member-variables-in-classes,
+  -misc-unused-parameters,
+  -modernize-avoid-c-arrays,
+  -modernize-pass-by-value,
+  -modernize-use-auto,
+  -modernize-use-nodiscard,
+  -modernize-use-trailing-return-type,
+  -modernize-use-using,
+  -readability-function-cognitive-complexity,
+  -readability-function-size,
+  -readability-identifier-length,
+  -readability-implicit-bool-conversion,
+  -readability-isolate-declaration,
+  -readability-magic-numbers,
+  -readability-named-parameter,
+  -readability-redundant-access-specifiers,
+  -readability-simplify-boolean-expr,
+  -readability-uppercase-literal-suffix,
+  -# only sometimes useful,
+  -bugprone-narrowing-conversions,
+  -cert-dcl58-cpp,
+  -cert-err33-c,
+  -cert-err58-cpp,
+  -clang-analyzer-core.CallAndMessage,
+  -clang-analyzer-cplusplus.NewDelete,
+  -clang-analyzer-cplusplus.NewDeleteLeaks,
+  -concurrency-mt-unsafe,
+  -cppcoreguidelines-init-variables,
+  -cppcoreguidelines-narrowing-conversions,
+  -cppcoreguidelines-prefer-member-initializer,
+  -cppcoreguidelines-pro-type-static-cast-downcast,
+  -misc-definitions-in-headers,
+  -modernize-concat-nested-namespaces,
+  -modernize-loop-convert,
+  -modernize-raw-string-literal,
+  -modernize-unary-static-assert,
+  -performance-no-automatic-move,
+  -readability-convert-member-functions-to-static,
+  -readability-else-after-return,
+  -readability-redundant-declaration,
+  -# obsoleted,
+  -cert-dcl21-cpp
+
+CheckOptions:
+  - { key: cppcoreguidelines-explicit-virtual-functions.IgnoreDestructors, value: true }
+  - { key: modernize-use-override.IgnoreDestructors, value: true }
+  - { key: performance-for-range-copy.AllowedTypes, value: "QJsonValue" }
+  - { key: performance-for-range-copy.WarnOnAllAutoCopies, value: true }
+  - { key: readability-braces-around-statements.ShortStatementLines, value: 3 }
+
+HeaderFilterRegex: ".+/src/.*\\.h"
+WarningsAsErrors: "*"
diff --git a/src/app/application.cpp b/src/app/application.cpp
index 02a9f8b8a..c50c82a4b 100644
--- a/src/app/application.cpp
+++ b/src/app/application.cpp
@@ -225,7 +225,7 @@ namespace
 Application::Application(int &argc, char **argv)
     : BaseApplication(argc, argv)
     , m_shutdownAct(ShutdownDialogAction::Exit)
-    , m_commandLineArgs(parseCommandLine(this->arguments()))
+    , m_commandLineArgs(parseCommandLine(Application::arguments()))
     , m_storeFileLoggerEnabled(FILELOGGER_SETTINGS_KEY(u"Enabled"_qs))
     , m_storeFileLoggerBackup(FILELOGGER_SETTINGS_KEY(u"Backup"_qs))
     , m_storeFileLoggerDeleteOld(FILELOGGER_SETTINGS_KEY(u"DeleteOld"_qs))
diff --git a/src/app/qtlocalpeer/qtlocalpeer.cpp b/src/app/qtlocalpeer/qtlocalpeer.cpp
index 757f6a08f..5e9dbe797 100644
--- a/src/app/qtlocalpeer/qtlocalpeer.cpp
+++ b/src/app/qtlocalpeer/qtlocalpeer.cpp
@@ -152,10 +152,10 @@ bool QtLocalPeer::sendMessage(const QString &message, const int timeout)
             break;
         int ms = 250;
 #if defined(Q_OS_WIN)
-        Sleep(DWORD(ms));
+        ::Sleep(DWORD(ms));
 #else
         struct timespec ts = { ms / 1000, (ms % 1000) * 1000 * 1000 };
-        nanosleep(&ts, NULL);
+        ::nanosleep(&ts, nullptr);
 #endif
     }
     if (!connOk)
diff --git a/src/base/bittorrent/customstorage.cpp b/src/base/bittorrent/customstorage.cpp
index 74f4f9e21..2d25e45a3 100644
--- a/src/base/bittorrent/customstorage.cpp
+++ b/src/base/bittorrent/customstorage.cpp
@@ -171,7 +171,7 @@ void CustomDiskIOThread::async_set_file_priority(lt::storage_index_t storage, lt
                                                  , std::function<void (const lt::storage_error &, lt::aux::vector<lt::download_priority_t, lt::file_index_t>)> handler)
 {
     m_nativeDiskIO->async_set_file_priority(storage, priorities
-                                            , [=, handler = std::move(handler)](const lt::storage_error &error, lt::aux::vector<lt::download_priority_t, lt::file_index_t> priorities)
+                                            , [=, handler = std::move(handler)](const lt::storage_error &error, const lt::aux::vector<lt::download_priority_t, lt::file_index_t> &priorities)
     {
         m_storageData[storage].filePriorities = priorities;
         handler(error, priorities);
diff --git a/src/base/bittorrent/filterparserthread.cpp b/src/base/bittorrent/filterparserthread.cpp
index eb599fa6b..cdd8f88b1 100644
--- a/src/base/bittorrent/filterparserthread.cpp
+++ b/src/base/bittorrent/filterparserthread.cpp
@@ -484,9 +484,9 @@ int FilterParserThread::parseP2BFilterFile()
     char buf[7];
     unsigned char version;
     if (!stream.readRawData(buf, sizeof(buf))
-        || memcmp(buf, "\xFF\xFF\xFF\xFFP2B", 7)
+        || (memcmp(buf, "\xFF\xFF\xFF\xFFP2B", 7) != 0)
         || !stream.readRawData(reinterpret_cast<char*>(&version), sizeof(version)))
-        {
+    {
         LogMsg(tr("Parsing Error: The filter file is not a valid PeerGuardian P2B file."), Log::CRITICAL);
         return ruleCount;
     }
diff --git a/src/base/bittorrent/filterparserthread.h b/src/base/bittorrent/filterparserthread.h
index 28a209a3a..b118d706e 100644
--- a/src/base/bittorrent/filterparserthread.h
+++ b/src/base/bittorrent/filterparserthread.h
@@ -55,8 +55,8 @@ protected:
     void run() override;
 
 private:
-    int findAndNullDelimiter(char *const data, char delimiter, int start, int end, bool reverse = false);
-    int trim(char *const data, int start, int end);
+    int findAndNullDelimiter(char *data, char delimiter, int start, int end, bool reverse = false);
+    int trim(char *data, int start, int end);
     int parseDATFilterFile();
     int parseP2PFilterFile();
     int getlineInStream(QDataStream &stream, std::string &name, char delim);
diff --git a/src/base/bittorrent/infohash.cpp b/src/base/bittorrent/infohash.cpp
index dcef97874..e4ee0f08d 100644
--- a/src/base/bittorrent/infohash.cpp
+++ b/src/base/bittorrent/infohash.cpp
@@ -93,7 +93,7 @@ BitTorrent::InfoHash::operator WrappedType() const
 
 BitTorrent::TorrentID BitTorrent::TorrentID::fromString(const QString &hashString)
 {
-    return TorrentID(BaseType::fromString(hashString));
+    return {BaseType::fromString(hashString)};
 }
 
 BitTorrent::TorrentID BitTorrent::TorrentID::fromInfoHash(const BitTorrent::InfoHash &infoHash)
@@ -103,7 +103,7 @@ BitTorrent::TorrentID BitTorrent::TorrentID::fromInfoHash(const BitTorrent::Info
 
 BitTorrent::TorrentID BitTorrent::TorrentID::fromSHA1Hash(const SHA1Hash &hash)
 {
-    return TorrentID(hash);
+    return {hash};
 }
 
 BitTorrent::TorrentID BitTorrent::TorrentID::fromSHA256Hash(const SHA256Hash &hash)
diff --git a/src/base/bittorrent/session.h b/src/base/bittorrent/session.h
index e0256aa00..663cb29fe 100644
--- a/src/base/bittorrent/session.h
+++ b/src/base/bittorrent/session.h
@@ -400,7 +400,7 @@ namespace BitTorrent
         virtual bool isTrackerFilteringEnabled() const = 0;
         virtual void setTrackerFilteringEnabled(bool enabled) = 0;
         virtual bool isExcludedFileNamesEnabled() const = 0;
-        virtual void setExcludedFileNamesEnabled(const bool enabled) = 0;
+        virtual void setExcludedFileNamesEnabled(bool enabled) = 0;
         virtual QStringList excludedFileNames() const = 0;
         virtual void setExcludedFileNames(const QStringList &newList) = 0;
         virtual bool isFilenameExcluded(const QString &fileName) const = 0;
diff --git a/src/base/bittorrent/sessionimpl.cpp b/src/base/bittorrent/sessionimpl.cpp
index 40557e227..091224bd2 100644
--- a/src/base/bittorrent/sessionimpl.cpp
+++ b/src/base/bittorrent/sessionimpl.cpp
@@ -72,7 +72,6 @@
 #endif
 #include <QNetworkInterface>
 #include <QRegularExpression>
-#include <QScopeGuard>
 #include <QString>
 #include <QThread>
 #include <QThreadPool>
@@ -1651,7 +1650,7 @@ lt::settings_pack SessionImpl::loadLTSettings() const
     settingsPack.set_int(lt::settings_pack::proxy_type, lt::settings_pack::none);
     if (Preferences::instance()->useProxyForBT())
     {
-        const auto proxyManager = Net::ProxyConfigurationManager::instance();
+        const auto *proxyManager = Net::ProxyConfigurationManager::instance();
         const Net::ProxyConfiguration proxyConfig = proxyManager->proxyConfiguration();
 
         switch (proxyConfig.type)
@@ -4986,7 +4985,7 @@ void SessionImpl::upgradeCategories()
     const auto legacyCategories = SettingValue<QVariantMap>(u"BitTorrent/Session/Categories"_qs).get();
     for (auto it = legacyCategories.cbegin(); it != legacyCategories.cend(); ++it)
     {
-        const QString categoryName = it.key();
+        const QString &categoryName = it.key();
         CategoryOptions categoryOptions;
         categoryOptions.savePath = Path(it.value().toString());
         m_categories[categoryName] = categoryOptions;
@@ -5229,7 +5228,7 @@ void SessionImpl::handleAddTorrentAlerts(const std::vector<lt::alert *> &alerts)
         if (a->type() != lt::add_torrent_alert::alert_type)
             continue;
 
-        auto alert = static_cast<const lt::add_torrent_alert *>(a);
+        const auto *alert = static_cast<const lt::add_torrent_alert *>(a);
         if (alert->error)
         {
             const QString msg = QString::fromStdString(alert->message());
diff --git a/src/base/bittorrent/sessionimpl.h b/src/base/bittorrent/sessionimpl.h
index 76dda63a2..449a7f44e 100644
--- a/src/base/bittorrent/sessionimpl.h
+++ b/src/base/bittorrent/sessionimpl.h
@@ -378,9 +378,9 @@ namespace BitTorrent
         bool isTrackerFilteringEnabled() const override;
         void setTrackerFilteringEnabled(bool enabled) override;
         bool isExcludedFileNamesEnabled() const override;
-        void setExcludedFileNamesEnabled(const bool enabled) override;
+        void setExcludedFileNamesEnabled(bool enabled) override;
         QStringList excludedFileNames() const override;
-        void setExcludedFileNames(const QStringList &newList) override;
+        void setExcludedFileNames(const QStringList &excludedFileNames) override;
         bool isFilenameExcluded(const QString &fileName) const override;
         QStringList bannedIPs() const override;
         void setBannedIPs(const QStringList &newList) override;
@@ -420,24 +420,24 @@ namespace BitTorrent
         void handleTorrentNeedSaveResumeData(const TorrentImpl *torrent);
         void handleTorrentSaveResumeDataRequested(const TorrentImpl *torrent);
         void handleTorrentSaveResumeDataFailed(const TorrentImpl *torrent);
-        void handleTorrentShareLimitChanged(TorrentImpl *const torrent);
-        void handleTorrentNameChanged(TorrentImpl *const torrent);
-        void handleTorrentSavePathChanged(TorrentImpl *const torrent);
-        void handleTorrentCategoryChanged(TorrentImpl *const torrent, const QString &oldCategory);
-        void handleTorrentTagAdded(TorrentImpl *const torrent, const QString &tag);
-        void handleTorrentTagRemoved(TorrentImpl *const torrent, const QString &tag);
-        void handleTorrentSavingModeChanged(TorrentImpl *const torrent);
-        void handleTorrentMetadataReceived(TorrentImpl *const torrent);
-        void handleTorrentPaused(TorrentImpl *const torrent);
-        void handleTorrentResumed(TorrentImpl *const torrent);
-        void handleTorrentChecked(TorrentImpl *const torrent);
-        void handleTorrentFinished(TorrentImpl *const torrent);
-        void handleTorrentTrackersAdded(TorrentImpl *const torrent, const QVector<TrackerEntry> &newTrackers);
-        void handleTorrentTrackersRemoved(TorrentImpl *const torrent, const QStringList &deletedTrackers);
-        void handleTorrentTrackersChanged(TorrentImpl *const torrent);
-        void handleTorrentUrlSeedsAdded(TorrentImpl *const torrent, const QVector<QUrl> &newUrlSeeds);
-        void handleTorrentUrlSeedsRemoved(TorrentImpl *const torrent, const QVector<QUrl> &urlSeeds);
-        void handleTorrentResumeDataReady(TorrentImpl *const torrent, const LoadTorrentParams &data);
+        void handleTorrentShareLimitChanged(TorrentImpl *torrent);
+        void handleTorrentNameChanged(TorrentImpl *torrent);
+        void handleTorrentSavePathChanged(TorrentImpl *torrent);
+        void handleTorrentCategoryChanged(TorrentImpl *torrent, const QString &oldCategory);
+        void handleTorrentTagAdded(TorrentImpl *torrent, const QString &tag);
+        void handleTorrentTagRemoved(TorrentImpl *torrent, const QString &tag);
+        void handleTorrentSavingModeChanged(TorrentImpl *torrent);
+        void handleTorrentMetadataReceived(TorrentImpl *torrent);
+        void handleTorrentPaused(TorrentImpl *torrent);
+        void handleTorrentResumed(TorrentImpl *torrent);
+        void handleTorrentChecked(TorrentImpl *torrent);
+        void handleTorrentFinished(TorrentImpl *torrent);
+        void handleTorrentTrackersAdded(TorrentImpl *torrent, const QVector<TrackerEntry> &newTrackers);
+        void handleTorrentTrackersRemoved(TorrentImpl *torrent, const QStringList &deletedTrackers);
+        void handleTorrentTrackersChanged(TorrentImpl *torrent);
+        void handleTorrentUrlSeedsAdded(TorrentImpl *torrent, const QVector<QUrl> &newUrlSeeds);
+        void handleTorrentUrlSeedsRemoved(TorrentImpl *torrent, const QVector<QUrl> &urlSeeds);
+        void handleTorrentResumeDataReady(TorrentImpl *torrent, const LoadTorrentParams &data);
         void handleTorrentInfoHashChanged(TorrentImpl *torrent, const InfoHash &prevInfoHash);
 
         bool addMoveTorrentStorageJob(TorrentImpl *torrent, const Path &newPath, MoveStorageMode mode, MoveStorageContext context);
diff --git a/src/base/bittorrent/torrent.h b/src/base/bittorrent/torrent.h
index bb6f76477..f501dc175 100644
--- a/src/base/bittorrent/torrent.h
+++ b/src/base/bittorrent/torrent.h
@@ -192,7 +192,6 @@ namespace BitTorrent
         virtual void setSavePath(const Path &savePath) = 0;
         virtual Path downloadPath() const = 0;
         virtual void setDownloadPath(const Path &downloadPath) = 0;
-        virtual Path actualStorageLocation() const = 0;
         virtual Path rootPath() const = 0;
         virtual Path contentPath() const = 0;
         virtual QString category() const = 0;
@@ -212,9 +211,7 @@ namespace BitTorrent
         virtual qreal ratioLimit() const = 0;
         virtual int seedingTimeLimit() const = 0;
 
-        virtual Path actualFilePath(int index) const = 0;
         virtual PathList filePaths() const = 0;
-        virtual QVector<DownloadPriority> filePriorities() const = 0;
 
         virtual TorrentInfo info() const = 0;
         virtual bool isFinished() const = 0;
@@ -232,7 +229,6 @@ namespace BitTorrent
         virtual bool isSequentialDownload() const = 0;
         virtual bool hasFirstLastPiecePriority() const = 0;
         virtual TorrentState state() const = 0;
-        virtual bool hasMetadata() const = 0;
         virtual bool hasMissingFiles() const = 0;
         virtual bool hasError() const = 0;
         virtual int queuePosition() const = 0;
@@ -244,7 +240,6 @@ namespace BitTorrent
         virtual qlonglong activeTime() const = 0;
         virtual qlonglong finishedTime() const = 0;
         virtual qlonglong eta() const = 0;
-        virtual QVector<qreal> filesProgress() const = 0;
         virtual int seedsCount() const = 0;
         virtual int peersCount() const = 0;
         virtual int leechsCount() const = 0;
@@ -277,13 +272,6 @@ namespace BitTorrent
         virtual int connectionsCount() const = 0;
         virtual int connectionsLimit() const = 0;
         virtual qlonglong nextAnnounce() const = 0;
-        /**
-         * @brief fraction of file pieces that are available at least from one peer
-         *
-         * This is not the same as torrrent availability, it is just a fraction of pieces
-         * that can be downloaded right now. It varies between 0 to 1.
-         */
-        virtual QVector<qreal> availableFileFractions() const = 0;
 
         virtual void setName(const QString &name) = 0;
         virtual void setSequentialDownload(bool enable) = 0;
@@ -301,7 +289,6 @@ namespace BitTorrent
         virtual void setDHTDisabled(bool disable) = 0;
         virtual void setPEXDisabled(bool disable) = 0;
         virtual void setLSDDisabled(bool disable) = 0;
-        virtual void flushCache() const = 0;
         virtual void addTrackers(QVector<TrackerEntry> trackers) = 0;
         virtual void removeTrackers(const QStringList &trackers) = 0;
         virtual void replaceTrackers(QVector<TrackerEntry> trackers) = 0;
diff --git a/src/base/bittorrent/torrentcreatorthread.h b/src/base/bittorrent/torrentcreatorthread.h
index ec09c8a4c..02b33f79b 100644
--- a/src/base/bittorrent/torrentcreatorthread.h
+++ b/src/base/bittorrent/torrentcreatorthread.h
@@ -74,7 +74,7 @@ namespace BitTorrent
         void create(const TorrentCreatorParams &params);
 
 #ifdef QBT_USES_LIBTORRENT2
-        static int calculateTotalPieces(const Path &inputPath, const int pieceSize, const TorrentFormat torrentFormat);
+        static int calculateTotalPieces(const Path &inputPath, int pieceSize, TorrentFormat torrentFormat);
 #else
         static int calculateTotalPieces(const Path &inputPath
             , const int pieceSize, const bool isAlignmentOptimized, int paddedFileSizeLimit);
diff --git a/src/base/bittorrent/torrentimpl.cpp b/src/base/bittorrent/torrentimpl.cpp
index 19575dbdd..4abc49c6a 100644
--- a/src/base/bittorrent/torrentimpl.cpp
+++ b/src/base/bittorrent/torrentimpl.cpp
@@ -98,7 +98,7 @@ namespace
         QString firstTrackerMessage;
         QString firstErrorMessage;
 #ifdef QBT_USES_LIBTORRENT2
-        const auto numEndpoints = static_cast<qsizetype>(nativeEntry.endpoints.size() * ((hashes.has_v1() && hashes.has_v2()) ? 2 : 1));
+        const auto numEndpoints = static_cast<qsizetype>(nativeEntry.endpoints.size()) * ((hashes.has_v1() && hashes.has_v2()) ? 2 : 1);
         for (const lt::announce_endpoint &endpoint : nativeEntry.endpoints)
         {
             for (const auto protocolVersion : {lt::protocol_version::V1, lt::protocol_version::V2})
@@ -338,7 +338,7 @@ TorrentImpl::TorrentImpl(SessionImpl *session, lt::session *nativeSession
     // == END UPGRADE CODE ==
 }
 
-TorrentImpl::~TorrentImpl() {}
+TorrentImpl::~TorrentImpl() = default;
 
 bool TorrentImpl::isValid() const
 {
@@ -1632,7 +1632,7 @@ void TorrentImpl::endReceivedMetadataHandling(const Path &savePath, const PathLi
     {
         const auto nativeIndex = nativeIndexes.at(i);
 
-        const Path actualFilePath = fileNames.at(i);
+        const Path &actualFilePath = fileNames.at(i);
         p.renamed_files[nativeIndex] = actualFilePath.toString().toStdString();
 
         const Path filePath = actualFilePath.removedExtension(QB_EXT);
diff --git a/src/base/bittorrent/torrentinfo.cpp b/src/base/bittorrent/torrentinfo.cpp
index e2b7533df..01080e28b 100644
--- a/src/base/bittorrent/torrentinfo.cpp
+++ b/src/base/bittorrent/torrentinfo.cpp
@@ -66,12 +66,6 @@ TorrentInfo::TorrentInfo(const lt::torrent_info &nativeInfo)
     }
 }
 
-TorrentInfo::TorrentInfo(const TorrentInfo &other)
-    : m_nativeInfo {other.m_nativeInfo}
-    , m_nativeIndexes {other.m_nativeIndexes}
-{
-}
-
 TorrentInfo &TorrentInfo::operator=(const TorrentInfo &other)
 {
     if (this != &other)
diff --git a/src/base/bittorrent/torrentinfo.h b/src/base/bittorrent/torrentinfo.h
index 71a778ad5..e9b467939 100644
--- a/src/base/bittorrent/torrentinfo.h
+++ b/src/base/bittorrent/torrentinfo.h
@@ -54,7 +54,7 @@ namespace BitTorrent
 
     public:
         TorrentInfo() = default;
-        TorrentInfo(const TorrentInfo &other);
+        TorrentInfo(const TorrentInfo &other) = default;
 
         explicit TorrentInfo(const lt::torrent_info &nativeInfo);
 
diff --git a/src/base/digest32.h b/src/base/digest32.h
index c4e8f26c5..1be904a2f 100644
--- a/src/base/digest32.h
+++ b/src/base/digest32.h
@@ -45,7 +45,7 @@ public:
 
     Digest32() = default;
     Digest32(const Digest32 &other) = default;
-    Digest32(Digest32 &&other) = default;
+    Digest32(Digest32 &&other) noexcept = default;
 
     Digest32(const UnderlyingType &nativeDigest)
         : m_dataPtr {new Data(nativeDigest)}
@@ -63,7 +63,7 @@ public:
     }
 
     Digest32 &operator=(const Digest32 &other) = default;
-    Digest32 &operator=(Digest32 &&other) = default;
+    Digest32 &operator=(Digest32 &&other) noexcept = default;
 
     operator UnderlyingType() const
     {
diff --git a/src/base/global.h b/src/base/global.h
index fdb251b94..255797250 100644
--- a/src/base/global.h
+++ b/src/base/global.h
@@ -42,7 +42,7 @@ constexpr typename std::add_const_t<T> &asConst(T &t) noexcept { return t; }
 
 // Forward rvalue as const
 template <typename T>
-constexpr typename std::add_const_t<T> asConst(T &&t) noexcept { return std::move(t); }
+constexpr typename std::add_const_t<T> asConst(T &&t) noexcept { return std::forward<T>(t); }
 
 // Prevent const rvalue arguments
 template <typename T>
diff --git a/src/base/http/irequesthandler.h b/src/base/http/irequesthandler.h
index 699ce4feb..54cb7d881 100644
--- a/src/base/http/irequesthandler.h
+++ b/src/base/http/irequesthandler.h
@@ -37,7 +37,7 @@ namespace Http
     class IRequestHandler
     {
     public:
-        virtual ~IRequestHandler() {}
+        virtual ~IRequestHandler() = default;
         virtual Response processRequest(const Request &request, const Environment &env) = 0;
     };
 }
diff --git a/src/base/http/requestparser.cpp b/src/base/http/requestparser.cpp
index b72d994cf..a64215251 100644
--- a/src/base/http/requestparser.cpp
+++ b/src/base/http/requestparser.cpp
@@ -75,10 +75,6 @@ namespace
     }
 }
 
-RequestParser::RequestParser()
-{
-}
-
 RequestParser::ParseResult RequestParser::parse(const QByteArray &data)
 {
     // Warning! Header names are converted to lowercase
diff --git a/src/base/http/requestparser.h b/src/base/http/requestparser.h
index b9eb7cdfa..56ecc51e8 100644
--- a/src/base/http/requestparser.h
+++ b/src/base/http/requestparser.h
@@ -57,7 +57,7 @@ namespace Http
         static const long MAX_CONTENT_SIZE = 64 * 1024 * 1024;  // 64 MB
 
     private:
-        RequestParser();
+        RequestParser() = default;
 
         ParseResult doParse(const QByteArray &data);
         bool parseStartLines(QStringView data);
diff --git a/src/base/iconprovider.cpp b/src/base/iconprovider.cpp
index 112b4352d..f2d285f1c 100644
--- a/src/base/iconprovider.cpp
+++ b/src/base/iconprovider.cpp
@@ -36,8 +36,6 @@ IconProvider::IconProvider(QObject *parent)
 {
 }
 
-IconProvider::~IconProvider() {}
-
 void IconProvider::initInstance()
 {
     if (!m_instance)
diff --git a/src/base/iconprovider.h b/src/base/iconprovider.h
index 33b44bf2d..35ba113ed 100644
--- a/src/base/iconprovider.h
+++ b/src/base/iconprovider.h
@@ -48,7 +48,7 @@ public:
 
 protected:
     explicit IconProvider(QObject *parent = nullptr);
-    ~IconProvider();
+    ~IconProvider() = default;
 
     static IconProvider *m_instance;
 };
diff --git a/src/base/net/downloadhandlerimpl.cpp b/src/base/net/downloadhandlerimpl.cpp
index e08a394a1..58648714b 100644
--- a/src/base/net/downloadhandlerimpl.cpp
+++ b/src/base/net/downloadhandlerimpl.cpp
@@ -208,7 +208,7 @@ void Net::DownloadHandlerImpl::handleRedirection(const QUrl &newUrl)
         return;
     }
 
-    auto redirected = static_cast<DownloadHandlerImpl *>(
+    auto *redirected = static_cast<DownloadHandlerImpl *>(
             m_manager->download(DownloadRequest(m_downloadRequest).url(newUrlString), useProxy()));
     redirected->m_redirectionCount = m_redirectionCount + 1;
     connect(redirected, &DownloadHandlerImpl::finished, this, [this](const DownloadResult &result)
diff --git a/src/base/net/downloadmanager.cpp b/src/base/net/downloadmanager.cpp
index 416ec19b9..2b08d6761 100644
--- a/src/base/net/downloadmanager.cpp
+++ b/src/base/net/downloadmanager.cpp
@@ -163,7 +163,7 @@ Net::DownloadHandler *Net::DownloadManager::download(const DownloadRequest &down
     const ServiceID id = ServiceID::fromURL(downloadRequest.url());
     const bool isSequentialService = m_sequentialServices.contains(id);
 
-    auto downloadHandler = new DownloadHandlerImpl(this, downloadRequest, useProxy);
+    auto *downloadHandler = new DownloadHandlerImpl(this, downloadRequest, useProxy);
     connect(downloadHandler, &DownloadHandler::finished, downloadHandler, &QObject::deleteLater);
     connect(downloadHandler, &QObject::destroyed, this, [this, id, downloadHandler]()
     {
@@ -274,7 +274,7 @@ void Net::DownloadManager::handleDownloadFinished(DownloadHandlerImpl *finishedH
         return;
     }
 
-    auto handler = waitingJobsIter.value().dequeue();
+    auto *handler = waitingJobsIter.value().dequeue();
     qDebug("Downloading %s...", qUtf8Printable(handler->url()));
     processRequest(handler);
     handler->disconnect(this);
diff --git a/src/base/net/smtp.cpp b/src/base/net/smtp.cpp
index d34ef9edc..f0cffb594 100644
--- a/src/base/net/smtp.cpp
+++ b/src/base/net/smtp.cpp
@@ -162,7 +162,7 @@ void Smtp::sendMail(const QString &from, const QString &to, const QString &subje
 
     // Connect to SMTP server
     const QStringList serverEndpoint = pref->getMailNotificationSMTP().split(u':');
-    const QString serverAddress = serverEndpoint[0];
+    const QString &serverAddress = serverEndpoint[0];
     const std::optional<int> serverPort = Utils::String::parseInt(serverEndpoint.value(1));
 
 #ifndef QT_NO_OPENSSL
diff --git a/src/base/preferences.h b/src/base/preferences.h
index 57b6e0499..f7c719966 100644
--- a/src/base/preferences.h
+++ b/src/base/preferences.h
@@ -253,7 +253,7 @@ public:
     void setUILocked(bool locked);
 
     bool isAutoRunOnTorrentAddedEnabled() const;
-    void setAutoRunOnTorrentAddedEnabled(const bool enabled);
+    void setAutoRunOnTorrentAddedEnabled(bool enabled);
     QString getAutoRunOnTorrentAddedProgram() const;
     void setAutoRunOnTorrentAddedProgram(const QString &program);
     bool isAutoRunOnTorrentFinishedEnabled() const;
diff --git a/src/base/profile_p.cpp b/src/base/profile_p.cpp
index 57a56beb0..e27a232a4 100644
--- a/src/base/profile_p.cpp
+++ b/src/base/profile_p.cpp
@@ -116,9 +116,9 @@ Path Private::DefaultProfile::downloadLocation() const
 std::unique_ptr<QSettings> Private::DefaultProfile::applicationSettings(const QString &name) const
 {
 #if defined(Q_OS_WIN) || defined(Q_OS_MACOS)
-    return std::unique_ptr<QSettings>(new QSettings(QSettings::IniFormat, QSettings::UserScope, profileName(), name));
+    return std::make_unique<QSettings>(QSettings::IniFormat, QSettings::UserScope, profileName(), name);
 #else
-    return std::unique_ptr<QSettings>(new QSettings(profileName(), name));
+    return std::make_unique<QSettings>(profileName(), name);
 #endif
 }
 
diff --git a/src/base/rss/rss_autodownloader.cpp b/src/base/rss/rss_autodownloader.cpp
index 1c74e169c..6aab0504a 100644
--- a/src/base/rss/rss_autodownloader.cpp
+++ b/src/base/rss/rss_autodownloader.cpp
@@ -382,13 +382,13 @@ void AutoDownloader::handleFeedURLChanged(Feed *feed, const QString &oldURL)
         }
     }
 
-    for (QSharedPointer<ProcessingJob> job : asConst(m_processingQueue))
+    for (const QSharedPointer<ProcessingJob> &job : asConst(m_processingQueue))
     {
         if (job->feedURL == oldURL)
             job->feedURL = feed->url();
     }
 
-    for (QSharedPointer<ProcessingJob> job : asConst(m_waitingJobs))
+    for (const QSharedPointer<ProcessingJob> &job : asConst(m_waitingJobs))
     {
         if (job->feedURL == oldURL)
             job->feedURL = feed->url();
diff --git a/src/base/rss/rss_autodownloadrule.cpp b/src/base/rss/rss_autodownloadrule.cpp
index b7b7cefe4..e6db0aede 100644
--- a/src/base/rss/rss_autodownloadrule.cpp
+++ b/src/base/rss/rss_autodownloadrule.cpp
@@ -208,12 +208,9 @@ AutoDownloadRule::AutoDownloadRule(const QString &name)
     setName(name);
 }
 
-AutoDownloadRule::AutoDownloadRule(const AutoDownloadRule &other)
-    : m_dataPtr(other.m_dataPtr)
-{
-}
+AutoDownloadRule::AutoDownloadRule(const AutoDownloadRule &other) = default;
 
-AutoDownloadRule::~AutoDownloadRule() {}
+AutoDownloadRule::~AutoDownloadRule() = default;
 
 QRegularExpression AutoDownloadRule::cachedRegex(const QString &expression, const bool isRegex) const
 {
diff --git a/src/base/rss/rss_autodownloadrule.h b/src/base/rss/rss_autodownloadrule.h
index afe6131b8..a37d14f91 100644
--- a/src/base/rss/rss_autodownloadrule.h
+++ b/src/base/rss/rss_autodownloadrule.h
@@ -49,7 +49,7 @@ namespace RSS
     class AutoDownloadRule
     {
     public:
-        explicit AutoDownloadRule(const QString &name = u""_qs);
+        explicit AutoDownloadRule(const QString &name = {});
         AutoDownloadRule(const AutoDownloadRule &other);
         ~AutoDownloadRule();
 
@@ -96,7 +96,7 @@ namespace RSS
         friend bool operator==(const AutoDownloadRule &left, const AutoDownloadRule &right);
 
         QJsonObject toJsonObject() const;
-        static AutoDownloadRule fromJsonObject(const QJsonObject &jsonObj, const QString &name = u""_qs);
+        static AutoDownloadRule fromJsonObject(const QJsonObject &jsonObj, const QString &name = {});
 
         QVariantHash toLegacyDict() const;
         static AutoDownloadRule fromLegacyDict(const QVariantHash &dict);
diff --git a/src/base/rss/rss_feed.cpp b/src/base/rss/rss_feed.cpp
index 3de73fe3c..a0b114360 100644
--- a/src/base/rss/rss_feed.cpp
+++ b/src/base/rss/rss_feed.cpp
@@ -345,7 +345,7 @@ bool Feed::addArticle(const QVariantHash &articleData)
 
 void Feed::removeOldestArticle()
 {
-    auto oldestArticle = m_articlesByDate.last();
+    auto *oldestArticle = m_articlesByDate.last();
     emit articleAboutToBeRemoved(oldestArticle);
 
     m_articles.remove(oldestArticle->guid());
diff --git a/src/base/rss/rss_folder.cpp b/src/base/rss/rss_folder.cpp
index 01a8ac70a..252f4b94c 100644
--- a/src/base/rss/rss_folder.cpp
+++ b/src/base/rss/rss_folder.cpp
@@ -49,7 +49,7 @@ Folder::~Folder()
 {
     emit aboutToBeDestroyed(this);
 
-    for (auto item : asConst(items()))
+    for (auto *item : asConst(items()))
         delete item;
 }
 
@@ -127,7 +127,7 @@ void Folder::addItem(Item *item)
     connect(item, &Item::articleAboutToBeRemoved, this, &Item::articleAboutToBeRemoved);
     connect(item, &Item::unreadCountChanged, this, &Folder::handleItemUnreadCountChanged);
 
-    for (auto article : asConst(item->articles()))
+    for (auto *article : asConst(item->articles()))
         emit newArticle(article);
 
     if (item->unreadCount() > 0)
@@ -138,7 +138,7 @@ void Folder::removeItem(Item *item)
 {
     Q_ASSERT(m_items.contains(item));
 
-    for (auto article : asConst(item->articles()))
+    for (auto *article : asConst(item->articles()))
         emit articleAboutToBeRemoved(article);
 
     item->disconnect(this);
diff --git a/src/base/rss/rss_folder.h b/src/base/rss/rss_folder.h
index 147267b7f..3441e3a02 100644
--- a/src/base/rss/rss_folder.h
+++ b/src/base/rss/rss_folder.h
@@ -46,7 +46,7 @@ namespace RSS
 
         friend class Session;
 
-        explicit Folder(const QString &path = u""_qs);
+        explicit Folder(const QString &path = {});
         ~Folder() override;
 
     public:
diff --git a/src/base/rss/rss_item.cpp b/src/base/rss/rss_item.cpp
index 05fe8677e..0d6da7a9d 100644
--- a/src/base/rss/rss_item.cpp
+++ b/src/base/rss/rss_item.cpp
@@ -45,8 +45,6 @@ Item::Item(const QString &path)
 {
 }
 
-Item::~Item() {}
-
 void Item::setPath(const QString &path)
 {
     if (path != m_path)
diff --git a/src/base/rss/rss_item.h b/src/base/rss/rss_item.h
index f16d22751..df7c6ff7b 100644
--- a/src/base/rss/rss_item.h
+++ b/src/base/rss/rss_item.h
@@ -76,7 +76,7 @@ namespace RSS
 
     protected:
         explicit Item(const QString &path);
-        ~Item() override;
+        ~Item() override = default;
 
         virtual void cleanup() = 0;
 
diff --git a/src/base/rss/rss_parser.cpp b/src/base/rss/rss_parser.cpp
index a312ba314..e07e7811d 100644
--- a/src/base/rss/rss_parser.cpp
+++ b/src/base/rss/rss_parser.cpp
@@ -541,7 +541,7 @@ namespace
 
 const int PARSINGRESULT_TYPEID = qRegisterMetaType<RSS::Private::ParsingResult>();
 
-RSS::Private::Parser::Parser(const QString lastBuildDate)
+RSS::Private::Parser::Parser(const QString &lastBuildDate)
 {
     m_result.lastBuildDate = lastBuildDate;
 }
diff --git a/src/base/rss/rss_parser.h b/src/base/rss/rss_parser.h
index d5fc4f938..7abfeeb2e 100644
--- a/src/base/rss/rss_parser.h
+++ b/src/base/rss/rss_parser.h
@@ -53,7 +53,7 @@ namespace RSS::Private
         Q_DISABLE_COPY_MOVE(Parser)
 
     public:
-        explicit Parser(QString lastBuildDate);
+        explicit Parser(const QString &lastBuildDate);
         void parse(const QByteArray &feedData);
 
     signals:
diff --git a/src/base/rss/rss_session.cpp b/src/base/rss/rss_session.cpp
index fc3990e44..ef01e5b98 100644
--- a/src/base/rss/rss_session.cpp
+++ b/src/base/rss/rss_session.cpp
@@ -100,7 +100,7 @@ Session::Session()
     // Remove legacy/corrupted settings
     // (at least on Windows, QSettings is case-insensitive and it can get
     // confused when asked about settings that differ only in their case)
-    auto settingsStorage = SettingsStorage::instance();
+    auto *settingsStorage = SettingsStorage::instance();
     settingsStorage->removeValue(u"Rss/streamList"_qs);
     settingsStorage->removeValue(u"Rss/streamAlias"_qs);
     settingsStorage->removeValue(u"Rss/open_folders"_qs);
@@ -140,7 +140,7 @@ nonstd::expected<void, QString> Session::addFolder(const QString &path)
     if (!result)
         return result.get_unexpected();
 
-    const auto destFolder = result.value();
+    auto *destFolder = result.value();
     addItem(new Folder(path), destFolder);
     store();
     return {};
@@ -155,7 +155,7 @@ nonstd::expected<void, QString> Session::addFeed(const QString &url, const QStri
     if (!result)
         return result.get_unexpected();
 
-    const auto destFolder = result.value();
+    auto *destFolder = result.value();
     auto *feed = new Feed(generateUID(), url, path, this);
     addItem(feed, destFolder);
     store();
@@ -198,7 +198,7 @@ nonstd::expected<void, QString> Session::moveItem(const QString &itemPath, const
     if (itemPath.isEmpty())
         return nonstd::make_unexpected(tr("Cannot move root folder."));
 
-    auto item = m_itemsByPath.value(itemPath);
+    auto *item = m_itemsByPath.value(itemPath);
     if (!item)
         return nonstd::make_unexpected(tr("Item doesn't exist: %1.").arg(itemPath));
 
@@ -214,11 +214,11 @@ nonstd::expected<void, QString> Session::moveItem(Item *item, const QString &des
     if (!result)
         return result.get_unexpected();
 
-    const auto destFolder = result.value();
+    auto *destFolder = result.value();
     if (static_cast<Item *>(destFolder) == item)
         return nonstd::make_unexpected(tr("Couldn't move folder into itself."));
 
-    auto srcFolder = static_cast<Folder *>(m_itemsByPath.value(Item::parentPath(item->path())));
+    auto *srcFolder = static_cast<Folder *>(m_itemsByPath.value(Item::parentPath(item->path())));
     if (srcFolder != destFolder)
     {
         srcFolder->removeItem(item);
@@ -242,7 +242,7 @@ nonstd::expected<void, QString> Session::removeItem(const QString &itemPath)
     emit itemAboutToBeRemoved(item);
     item->cleanup();
 
-    auto folder = static_cast<Folder *>(m_itemsByPath.value(Item::parentPath(item->path())));
+    auto *folder = static_cast<Folder *>(m_itemsByPath.value(Item::parentPath(item->path())));
     folder->removeItem(item);
     delete item;
     store();
@@ -410,7 +410,7 @@ nonstd::expected<Folder *, QString> Session::prepareItemDest(const QString &path
         return nonstd::make_unexpected(tr("RSS item with given path already exists: %1.").arg(path));
 
     const QString destFolderPath = Item::parentPath(path);
-    const auto destFolder = qobject_cast<Folder *>(m_itemsByPath.value(destFolderPath));
+    auto *destFolder = qobject_cast<Folder *>(m_itemsByPath.value(destFolderPath));
     if (!destFolder)
         return nonstd::make_unexpected(tr("Parent folder doesn't exist: %1.").arg(destFolderPath));
 
@@ -419,21 +419,21 @@ nonstd::expected<Folder *, QString> Session::prepareItemDest(const QString &path
 
 Folder *Session::addSubfolder(const QString &name, Folder *parentFolder)
 {
-    auto folder = new Folder(Item::joinPath(parentFolder->path(), name));
+    auto *folder = new Folder(Item::joinPath(parentFolder->path(), name));
     addItem(folder, parentFolder);
     return folder;
 }
 
 Feed *Session::addFeedToFolder(const QUuid &uid, const QString &url, const QString &name, Folder *parentFolder)
 {
-    auto feed = new Feed(uid, url, Item::joinPath(parentFolder->path(), name), this);
+    auto *feed = new Feed(uid, url, Item::joinPath(parentFolder->path(), name), this);
     addItem(feed, parentFolder);
     return feed;
 }
 
 void Session::addItem(Item *item, Folder *destFolder)
 {
-    if (auto feed = qobject_cast<Feed *>(item))
+    if (auto *feed = qobject_cast<Feed *>(item))
     {
         connect(feed, &Feed::titleChanged, this, &Session::handleFeedTitleChanged);
         connect(feed, &Feed::iconLoaded, this, &Session::feedIconLoaded);
@@ -530,7 +530,7 @@ QThread *Session::workingThread() const
 void Session::handleItemAboutToBeDestroyed(Item *item)
 {
     m_itemsByPath.remove(item->path());
-    auto feed = qobject_cast<Feed *>(item);
+    auto *feed = qobject_cast<Feed *>(item);
     if (feed)
     {
         m_feedsByUID.remove(feed->uid());
diff --git a/src/base/search/searchdownloadhandler.cpp b/src/base/search/searchdownloadhandler.cpp
index dbbee9bbd..75b737f71 100644
--- a/src/base/search/searchdownloadhandler.cpp
+++ b/src/base/search/searchdownloadhandler.cpp
@@ -46,7 +46,7 @@ SearchDownloadHandler::SearchDownloadHandler(const QString &siteUrl, const QStri
             , this, &SearchDownloadHandler::downloadProcessFinished);
     const QStringList params
     {
-        (m_manager->engineLocation() / Path(u"nova2dl.py"_qs)).toString(),
+        (SearchPluginManager::engineLocation() / Path(u"nova2dl.py"_qs)).toString(),
         siteUrl,
         url
     };
diff --git a/src/base/search/searchhandler.cpp b/src/base/search/searchhandler.cpp
index 691d0b79e..a3fde897b 100644
--- a/src/base/search/searchhandler.cpp
+++ b/src/base/search/searchhandler.cpp
@@ -73,7 +73,7 @@ SearchHandler::SearchHandler(const QString &pattern, const QString &category, co
 
     const QStringList params
     {
-        (m_manager->engineLocation() / Path(u"nova2.py"_qs)).toString(),
+        (SearchPluginManager::engineLocation() / Path(u"nova2.py"_qs)).toString(),
         m_usedPlugins.join(u','),
         m_category
     };
diff --git a/src/base/search/searchpluginmanager.cpp b/src/base/search/searchpluginmanager.cpp
index 097c34045..b697ef05b 100644
--- a/src/base/search/searchpluginmanager.cpp
+++ b/src/base/search/searchpluginmanager.cpp
@@ -609,7 +609,7 @@ void SearchPluginManager::parseVersionInfo(const QByteArray &info)
     }
 }
 
-bool SearchPluginManager::isUpdateNeeded(const QString &pluginName, const PluginVersion newVersion) const
+bool SearchPluginManager::isUpdateNeeded(const QString &pluginName, const PluginVersion &newVersion) const
 {
     const PluginInfo *plugin = pluginInfo(pluginName);
     if (!plugin) return true;
diff --git a/src/base/search/searchpluginmanager.h b/src/base/search/searchpluginmanager.h
index e87e9d8a4..0425f9439 100644
--- a/src/base/search/searchpluginmanager.h
+++ b/src/base/search/searchpluginmanager.h
@@ -80,7 +80,7 @@ public:
     void updatePlugin(const QString &name);
     void installPlugin(const QString &source);
     bool uninstallPlugin(const QString &name);
-    static void updateIconPath(PluginInfo *const plugin);
+    static void updateIconPath(PluginInfo *plugin);
     void checkForUpdates();
 
     SearchHandler *startSearch(const QString &pattern, const QString &category, const QStringList &usedPlugins);
@@ -109,7 +109,7 @@ private:
     void updateNova();
     void parseVersionInfo(const QByteArray &info);
     void installPlugin_impl(const QString &name, const Path &path);
-    bool isUpdateNeeded(const QString &pluginName, PluginVersion newVersion) const;
+    bool isUpdateNeeded(const QString &pluginName, const PluginVersion &newVersion) const;
 
     void versionInfoDownloadFinished(const Net::DownloadResult &result);
     void pluginDownloadFinished(const Net::DownloadResult &result);
diff --git a/src/base/torrentfileguard.cpp b/src/base/torrentfileguard.cpp
index 9c398b365..125d3aae6 100644
--- a/src/base/torrentfileguard.cpp
+++ b/src/base/torrentfileguard.cpp
@@ -59,7 +59,6 @@ FileGuard::~FileGuard()
 TorrentFileGuard::TorrentFileGuard(const Path &path, const TorrentFileGuard::AutoDeleteMode mode)
     : FileGuard {mode != Never ? path : Path()}
     , m_mode {mode}
-    , m_wasAdded {false}
 {
 }
 
diff --git a/src/base/torrentfilter.cpp b/src/base/torrentfilter.cpp
index 9eb2a8833..1c81da452 100644
--- a/src/base/torrentfilter.cpp
+++ b/src/base/torrentfilter.cpp
@@ -62,8 +62,7 @@ TorrentFilter::TorrentFilter(const Type type, const std::optional<TorrentIDSet>
 
 TorrentFilter::TorrentFilter(const QString &filter, const std::optional<TorrentIDSet> &idSet
                              , const std::optional<QString> &category, const std::optional<QString> &tag)
-    : m_type(All)
-    , m_category(category)
+    : m_category(category)
     , m_tag(tag)
     , m_idSet(idSet)
 {
diff --git a/src/base/utils/bytearray.h b/src/base/utils/bytearray.h
index c3d959b4c..8d00f1671 100644
--- a/src/base/utils/bytearray.h
+++ b/src/base/utils/bytearray.h
@@ -36,7 +36,7 @@ class QByteArray;
 namespace Utils::ByteArray
 {
     // Mimic QStringView(in).split(sep, behavior)
-    QVector<QByteArray> splitToViews(const QByteArray &in, const QByteArray &sep, const Qt::SplitBehavior behavior = Qt::KeepEmptyParts);
+    QVector<QByteArray> splitToViews(const QByteArray &in, const QByteArray &sep, Qt::SplitBehavior behavior = Qt::KeepEmptyParts);
 
     // Mimic QByteArray::mid(pos, len) but instead of returning a full-copy,
     // we only return a partial view
diff --git a/src/base/utils/io.h b/src/base/utils/io.h
index 06a2d71e1..767381ebe 100644
--- a/src/base/utils/io.h
+++ b/src/base/utils/io.h
@@ -53,7 +53,7 @@ namespace Utils::IO
         using pointer = void;
         using reference = void;
 
-        explicit FileDeviceOutputIterator(QFileDevice &device, const int bufferSize = (4 * 1024));
+        explicit FileDeviceOutputIterator(QFileDevice &device, int bufferSize = (4 * 1024));
         FileDeviceOutputIterator(const FileDeviceOutputIterator &other) = default;
         ~FileDeviceOutputIterator();
 
diff --git a/src/gui/advancedsettings.cpp b/src/gui/advancedsettings.cpp
index e9d6ca2ae..7e2ac691d 100644
--- a/src/gui/advancedsettings.cpp
+++ b/src/gui/advancedsettings.cpp
@@ -831,7 +831,7 @@ void AdvancedSettings::loadAdvancedSettings()
 template <typename T>
 void AdvancedSettings::addRow(const int row, const QString &text, T *widget)
 {
-    auto label = new QLabel(text);
+    auto *label = new QLabel(text);
     label->setOpenExternalLinks(true);
 
     setCellWidget(row, PROPERTY, label);
diff --git a/src/gui/desktopintegration.cpp b/src/gui/desktopintegration.cpp
index 825d8cb99..ad5c7cae9 100644
--- a/src/gui/desktopintegration.cpp
+++ b/src/gui/desktopintegration.cpp
@@ -100,8 +100,7 @@ DesktopIntegration::DesktopIntegration(QObject *parent)
 
 DesktopIntegration::~DesktopIntegration()
 {
-    if (m_menu)
-        delete m_menu;
+    delete m_menu;
 }
 
 bool DesktopIntegration::isActive() const
diff --git a/src/gui/desktopintegration.h b/src/gui/desktopintegration.h
index 3d55262e7..62dbbc4a9 100644
--- a/src/gui/desktopintegration.h
+++ b/src/gui/desktopintegration.h
@@ -63,7 +63,7 @@ public:
 
     int notificationTimeout() const;
 #ifdef QBT_USES_DBUS
-    void setNotificationTimeout(const int value);
+    void setNotificationTimeout(int value);
 #endif
 
     void showNotification(const QString &title, const QString &msg) const;
diff --git a/src/gui/fspathedit_p.cpp b/src/gui/fspathedit_p.cpp
index c0488fff1..db4498925 100644
--- a/src/gui/fspathedit_p.cpp
+++ b/src/gui/fspathedit_p.cpp
@@ -152,8 +152,6 @@ Private::FileLineEdit::FileLineEdit(QWidget *parent)
     : QLineEdit {parent}
     , m_completerModel {new QFileSystemModel(this)}
     , m_completer {new QCompleter(this)}
-    , m_browseAction {nullptr}
-    , m_warningAction {nullptr}
 {
     m_iconProvider.setOptions(QFileIconProvider::DontUseCustomDirectoryIcons);
 
diff --git a/src/gui/mainwindow.cpp b/src/gui/mainwindow.cpp
index befe5cd00..126216f7b 100644
--- a/src/gui/mainwindow.cpp
+++ b/src/gui/mainwindow.cpp
@@ -942,7 +942,7 @@ void MainWindow::askRecursiveTorrentDownloadConfirmation(const BitTorrent::Torre
 
 void MainWindow::on_actionSetGlobalSpeedLimits_triggered()
 {
-    auto dialog = new SpeedLimitDialog {this};
+    auto *dialog = new SpeedLimitDialog {this};
     dialog->setAttribute(Qt::WA_DeleteOnClose);
     dialog->open();
 }
diff --git a/src/gui/optionsdialog.cpp b/src/gui/optionsdialog.cpp
index d94f65486..fc975c4fc 100644
--- a/src/gui/optionsdialog.cpp
+++ b/src/gui/optionsdialog.cpp
@@ -334,7 +334,7 @@ void OptionsDialog::loadBehaviorTabOptions()
     });
     connect(m_ui->buttonCustomizeUITheme, &QPushButton::clicked, this, [this]
     {
-        auto dialog = new UIThemeDialog(this);
+        auto *dialog = new UIThemeDialog(this);
         dialog->setAttribute(Qt::WA_DeleteOnClose);
         dialog->open();
     });
@@ -698,7 +698,7 @@ void OptionsDialog::saveDownloadsTabOptions() const
     session->setTorrentExportDirectory(getTorrentExportDir());
     session->setFinishedTorrentExportDirectory(getFinishedTorrentExportDir());
 
-    auto watchedFoldersModel = static_cast<WatchedFoldersModel *>(m_ui->scanFoldersView->model());
+    auto *watchedFoldersModel = static_cast<WatchedFoldersModel *>(m_ui->scanFoldersView->model());
     watchedFoldersModel->apply();
 
     session->setExcludedFileNamesEnabled(m_ui->groupExcludedFileNames->isChecked());
@@ -882,7 +882,7 @@ void OptionsDialog::saveConnectionTabOptions() const
     session->setI2PPort(m_ui->spinI2PPort->value());
     session->setI2PMixedMode(m_ui->checkI2PMixed->isChecked());
 
-    auto proxyConfigManager = Net::ProxyConfigurationManager::instance();
+    auto *proxyConfigManager = Net::ProxyConfigurationManager::instance();
     Net::ProxyConfiguration proxyConf;
     proxyConf.type = getProxyType();
     proxyConf.ip = getProxyIp();
@@ -1668,13 +1668,13 @@ void OptionsDialog::on_addWatchedFolderButton_clicked()
     if (dir.isEmpty())
         return;
 
-    auto dialog = new WatchedFolderOptionsDialog({}, this);
+    auto *dialog = new WatchedFolderOptionsDialog({}, this);
     dialog->setAttribute(Qt::WA_DeleteOnClose);
     connect(dialog, &QDialog::accepted, this, [this, dialog, dir, pref]()
     {
         try
         {
-            auto watchedFoldersModel = static_cast<WatchedFoldersModel *>(m_ui->scanFoldersView->model());
+            auto *watchedFoldersModel = static_cast<WatchedFoldersModel *>(m_ui->scanFoldersView->model());
             watchedFoldersModel->addFolder(dir, dialog->watchedFolderOptions());
 
             pref->setScanDirsLastPath(dir);
@@ -1722,8 +1722,8 @@ void OptionsDialog::editWatchedFolderOptions(const QModelIndex &index)
     if (!index.isValid())
         return;
 
-    auto watchedFoldersModel = static_cast<WatchedFoldersModel *>(m_ui->scanFoldersView->model());
-    auto dialog = new WatchedFolderOptionsDialog(watchedFoldersModel->folderOptions(index.row()), this);
+    auto *watchedFoldersModel = static_cast<WatchedFoldersModel *>(m_ui->scanFoldersView->model());
+    auto *dialog = new WatchedFolderOptionsDialog(watchedFoldersModel->folderOptions(index.row()), this);
     dialog->setAttribute(Qt::WA_DeleteOnClose);
     connect(dialog, &QDialog::accepted, this, [this, dialog, index, watchedFoldersModel]()
     {
@@ -1880,7 +1880,7 @@ bool OptionsDialog::schedTimesOk()
 
 void OptionsDialog::on_banListButton_clicked()
 {
-    auto dialog = new BanListOptionsDialog(this);
+    auto *dialog = new BanListOptionsDialog(this);
     dialog->setAttribute(Qt::WA_DeleteOnClose);
     connect(dialog, &QDialog::accepted, this, &OptionsDialog::enableApplyButton);
     dialog->open();
@@ -1888,7 +1888,7 @@ void OptionsDialog::on_banListButton_clicked()
 
 void OptionsDialog::on_IPSubnetWhitelistButton_clicked()
 {
-    auto dialog = new IPSubnetWhitelistOptionsDialog(this);
+    auto *dialog = new IPSubnetWhitelistOptionsDialog(this);
     dialog->setAttribute(Qt::WA_DeleteOnClose);
     connect(dialog, &QDialog::accepted, this, &OptionsDialog::enableApplyButton);
     dialog->open();
diff --git a/src/gui/powermanagement/powermanagement.cpp b/src/gui/powermanagement/powermanagement.cpp
index 174548cf8..dfdfb6e54 100644
--- a/src/gui/powermanagement/powermanagement.cpp
+++ b/src/gui/powermanagement/powermanagement.cpp
@@ -50,10 +50,6 @@ PowerManagement::PowerManagement(QObject *parent)
 #endif
 }
 
-PowerManagement::~PowerManagement()
-{
-}
-
 void PowerManagement::setActivityState(const bool busy)
 {
     if (busy)
diff --git a/src/gui/powermanagement/powermanagement.h b/src/gui/powermanagement/powermanagement.h
index f83192293..d8019d79c 100644
--- a/src/gui/powermanagement/powermanagement.h
+++ b/src/gui/powermanagement/powermanagement.h
@@ -47,7 +47,7 @@ class PowerManagement : public QObject
 
 public:
   PowerManagement(QObject *parent = nullptr);
-  virtual ~PowerManagement();
+  virtual ~PowerManagement() = default;
 
   void setActivityState(bool busy);
 
diff --git a/src/gui/powermanagement/powermanagement_x11.cpp b/src/gui/powermanagement/powermanagement_x11.cpp
index c3027d8b4..18f244ea5 100644
--- a/src/gui/powermanagement/powermanagement_x11.cpp
+++ b/src/gui/powermanagement/powermanagement_x11.cpp
@@ -51,10 +51,6 @@ PowerManagementInhibitor::PowerManagementInhibitor(QObject *parent)
     m_useGSM = false;
 }
 
-PowerManagementInhibitor::~PowerManagementInhibitor()
-{
-}
-
 void PowerManagementInhibitor::requestIdle()
 {
     m_intendedState = Idle;
diff --git a/src/gui/powermanagement/powermanagement_x11.h b/src/gui/powermanagement/powermanagement_x11.h
index 34defe1b8..5b9b6a88d 100644
--- a/src/gui/powermanagement/powermanagement_x11.h
+++ b/src/gui/powermanagement/powermanagement_x11.h
@@ -39,7 +39,7 @@ class PowerManagementInhibitor : public QObject
 
 public:
     PowerManagementInhibitor(QObject *parent = nullptr);
-    virtual ~PowerManagementInhibitor();
+    virtual ~PowerManagementInhibitor() = default;
 
     void requestIdle();
     void requestBusy();
diff --git a/src/gui/previewselectdialog.cpp b/src/gui/previewselectdialog.cpp
index b7c05f16e..f2f41d2d3 100644
--- a/src/gui/previewselectdialog.cpp
+++ b/src/gui/previewselectdialog.cpp
@@ -145,7 +145,7 @@ void PreviewSelectDialog::previewButtonClicked()
 
 void PreviewSelectDialog::displayColumnHeaderMenu()
 {
-    auto menu = new QMenu(this);
+    auto *menu = new QMenu(this);
     menu->setAttribute(Qt::WA_DeleteOnClose);
     menu->setToolTipsVisible(true);
 
diff --git a/src/gui/properties/downloadedpiecesbar.h b/src/gui/properties/downloadedpiecesbar.h
index 29c33a2f8..d98a114b2 100644
--- a/src/gui/properties/downloadedpiecesbar.h
+++ b/src/gui/properties/downloadedpiecesbar.h
@@ -52,7 +52,7 @@ public:
 private:
     // scale bitfield vector to float vector
     QVector<float> bitfieldToFloatVector(const QBitArray &vecin, int reqSize);
-    virtual bool updateImage(QImage &image) override;
+    bool updateImage(QImage &image) override;
     QString simpleToolTipText() const override;
 
     // incomplete piece color
diff --git a/src/gui/properties/piecesbar.h b/src/gui/properties/piecesbar.h
index 1ee7299d4..1e87ba364 100644
--- a/src/gui/properties/piecesbar.h
+++ b/src/gui/properties/piecesbar.h
@@ -55,7 +55,7 @@ public:
     virtual void clear();
 
     // QObject interface
-    virtual bool event(QEvent *e) override;
+    bool event(QEvent *e) override;
 
 protected:
     // QWidget interface
diff --git a/src/gui/properties/propertieswidget.h b/src/gui/properties/propertieswidget.h
index d28e74e70..a8f0f9f95 100644
--- a/src/gui/properties/propertieswidget.h
+++ b/src/gui/properties/propertieswidget.h
@@ -76,16 +76,16 @@ public:
 
 public slots:
     void setVisibility(bool visible);
-    void loadTorrentInfos(BitTorrent::Torrent *const torrent);
+    void loadTorrentInfos(BitTorrent::Torrent *torrent);
     void loadDynamicData();
     void clear();
     void readSettings();
     void saveSettings();
     void reloadPreferences();
-    void loadTrackers(BitTorrent::Torrent *const torrent);
+    void loadTrackers(BitTorrent::Torrent *torrent);
 
 protected slots:
-    void updateTorrentInfos(BitTorrent::Torrent *const torrent);
+    void updateTorrentInfos(BitTorrent::Torrent *torrent);
     void loadUrlSeeds();
     void askWebSeed();
     void deleteSelectedUrlSeeds();
@@ -97,7 +97,7 @@ protected slots:
 
 private slots:
     void configure();
-    void updateSavePath(BitTorrent::Torrent *const torrent);
+    void updateSavePath(BitTorrent::Torrent *torrent);
 
 private:
     QPushButton *getButtonFromIndex(int index);
diff --git a/src/gui/properties/trackerlistwidget.cpp b/src/gui/properties/trackerlistwidget.cpp
index 963df819d..cffb6d244 100644
--- a/src/gui/properties/trackerlistwidget.cpp
+++ b/src/gui/properties/trackerlistwidget.cpp
@@ -58,8 +58,7 @@
 #define NB_STICKY_ITEM 3
 
 TrackerListWidget::TrackerListWidget(PropertiesWidget *properties)
-    : QTreeWidget()
-    , m_properties(properties)
+    : m_properties(properties)
 {
     // Set header
     // Must be set before calling loadSettings() otherwise the header is reset on restart
@@ -438,7 +437,7 @@ void TrackerListWidget::openAddTrackersDialog()
     if (!torrent)
         return;
 
-    const auto dialog = new TrackersAdditionDialog(this, torrent);
+    auto *dialog = new TrackersAdditionDialog(this, torrent);
     dialog->setAttribute(Qt::WA_DeleteOnClose);
     dialog->open();
 }
diff --git a/src/gui/properties/trackersadditiondialog.h b/src/gui/properties/trackersadditiondialog.h
index b9313b6fd..0dc658cff 100644
--- a/src/gui/properties/trackersadditiondialog.h
+++ b/src/gui/properties/trackersadditiondialog.h
@@ -54,7 +54,7 @@ class TrackersAdditionDialog : public QDialog
     Q_DISABLE_COPY_MOVE(TrackersAdditionDialog)
 
 public:
-    TrackersAdditionDialog(QWidget *parent, BitTorrent::Torrent *const torrent);
+    TrackersAdditionDialog(QWidget *parent, BitTorrent::Torrent *torrent);
     ~TrackersAdditionDialog();
 
 private slots:
diff --git a/src/gui/rss/articlelistwidget.cpp b/src/gui/rss/articlelistwidget.cpp
index 5b4cac365..6437c3184 100644
--- a/src/gui/rss/articlelistwidget.cpp
+++ b/src/gui/rss/articlelistwidget.cpp
@@ -71,11 +71,11 @@ void ArticleListWidget::setRSSItem(RSS::Item *rssItem, bool unreadOnly)
         connect(m_rssItem, &RSS::Item::articleRead, this, &ArticleListWidget::handleArticleRead);
         connect(m_rssItem, &RSS::Item::articleAboutToBeRemoved, this, &ArticleListWidget::handleArticleAboutToBeRemoved);
 
-        for (const auto article : asConst(rssItem->articles()))
+        for (auto *article : asConst(rssItem->articles()))
         {
             if (!(m_unreadOnly && article->isRead()))
             {
-                auto item = createItem(article);
+                auto *item = createItem(article);
                 addItem(item);
                 m_rssArticleToListItemMapping.insert(article, item);
             }
@@ -89,7 +89,7 @@ void ArticleListWidget::handleArticleAdded(RSS::Article *rssArticle)
 {
     if (!(m_unreadOnly && rssArticle->isRead()))
     {
-        auto item = createItem(rssArticle);
+        auto *item = createItem(rssArticle);
         insertItem(0, item);
         m_rssArticleToListItemMapping.insert(rssArticle, item);
     }
@@ -99,7 +99,7 @@ void ArticleListWidget::handleArticleAdded(RSS::Article *rssArticle)
 
 void ArticleListWidget::handleArticleRead(RSS::Article *rssArticle)
 {
-    auto item = mapRSSArticle(rssArticle);
+    auto *item = mapRSSArticle(rssArticle);
     if (!item) return;
 
     const QBrush foregroundBrush {UIThemeManager::instance()->getColor(u"RSS.ReadArticle"_qs)};
diff --git a/src/gui/rss/automatedrssdownloader.cpp b/src/gui/rss/automatedrssdownloader.cpp
index bbd5bc1e7..c5add9633 100644
--- a/src/gui/rss/automatedrssdownloader.cpp
+++ b/src/gui/rss/automatedrssdownloader.cpp
@@ -64,7 +64,6 @@ AutomatedRssDownloader::AutomatedRssDownloader(QWidget *parent)
     , m_formatFilterJSON(u"%1 (*%2)"_qs.arg(tr("Rules"), EXT_JSON))
     , m_formatFilterLegacy(u"%1 (*%2)"_qs.arg(tr("Rules (legacy)"), EXT_LEGACY))
     , m_ui(new Ui::AutomatedRssDownloader)
-    , m_currentRuleItem(nullptr)
     , m_storeDialogSize {u"RssFeedDownloader/geometrySize"_qs}
 #if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
     , m_storeHSplitterSize {u"GUI/Qt6/RSSFeedDownloader/HSplitterSizes"_qs}
@@ -193,7 +192,7 @@ void AutomatedRssDownloader::loadFeedList()
 {
     const QSignalBlocker feedListSignalBlocker(m_ui->listFeeds);
 
-    for (const auto feed : asConst(RSS::Session::instance()->feeds()))
+    for (const auto *feed : asConst(RSS::Session::instance()->feeds()))
     {
         QListWidgetItem *item = new QListWidgetItem(feed->name(), m_ui->listFeeds);
         item->setData(Qt::UserRole, feed->url());
@@ -637,11 +636,11 @@ void AutomatedRssDownloader::updateMatchingArticles()
                                        : RSS::AutoDownloader::instance()->ruleByName(ruleItem->text()));
         for (const QString &feedURL : asConst(rule.feedURLs()))
         {
-            auto feed = RSS::Session::instance()->feedByURL(feedURL);
+            auto *feed = RSS::Session::instance()->feedByURL(feedURL);
             if (!feed) continue; // feed doesn't exist
 
             QStringList matchingArticles;
-            for (const auto article : asConst(feed->articles()))
+            for (const auto *article : asConst(feed->articles()))
                 if (rule.matches(article->data()))
                     matchingArticles << article->title();
             if (!matchingArticles.isEmpty())
@@ -854,7 +853,7 @@ void AutomatedRssDownloader::handleRuleAdded(const QString &ruleName)
 
 void AutomatedRssDownloader::handleRuleRenamed(const QString &ruleName, const QString &oldRuleName)
 {
-    auto item = m_itemsByRuleName.take(oldRuleName);
+    auto *item = m_itemsByRuleName.take(oldRuleName);
     m_itemsByRuleName.insert(ruleName, item);
     if (m_currentRule.name() == oldRuleName)
         m_currentRule.setName(ruleName);
@@ -863,7 +862,7 @@ void AutomatedRssDownloader::handleRuleRenamed(const QString &ruleName, const QS
 
 void AutomatedRssDownloader::handleRuleChanged(const QString &ruleName)
 {
-    auto item = m_itemsByRuleName.value(ruleName);
+    auto *item = m_itemsByRuleName.value(ruleName);
     if (item && (item != m_currentRuleItem))
         item->setCheckState(RSS::AutoDownloader::instance()->ruleByName(ruleName).isEnabled() ? Qt::Checked : Qt::Unchecked);
 }
diff --git a/src/gui/rss/feedlistwidget.cpp b/src/gui/rss/feedlistwidget.cpp
index 428fd9546..dba3a7b25 100644
--- a/src/gui/rss/feedlistwidget.cpp
+++ b/src/gui/rss/feedlistwidget.cpp
@@ -123,7 +123,7 @@ FeedListWidget::FeedListWidget(QWidget *parent)
 
 void FeedListWidget::handleItemAdded(RSS::Item *rssItem)
 {
-    auto parentItem = m_rssToTreeItemMapping.value(
+    auto *parentItem = m_rssToTreeItemMapping.value(
                 RSS::Session::instance()->itemByPath(RSS::Item::parentPath(rssItem->path())));
     createItem(rssItem, parentItem);
 }
@@ -264,7 +264,7 @@ void FeedListWidget::dropEvent(QDropEvent *event)
     // move as much items as possible
     for (QTreeWidgetItem *srcItem : asConst(selectedItems()))
     {
-        auto rssItem = getRSSItem(srcItem);
+        auto *rssItem = getRSSItem(srcItem);
         RSS::Session::instance()->moveItem(rssItem, RSS::Item::joinPath(destFolder->path(), rssItem->name()));
     }
 
@@ -281,7 +281,7 @@ QTreeWidgetItem *FeedListWidget::createItem(RSS::Item *rssItem, QTreeWidgetItem
     m_rssToTreeItemMapping[rssItem] = item;
 
     QIcon icon;
-    if (auto feed = qobject_cast<RSS::Feed *>(rssItem))
+    if (auto *feed = qobject_cast<RSS::Feed *>(rssItem))
         icon = rssFeedIcon(feed);
     else
         icon = UIThemeManager::instance()->getIcon(u"directory"_qs);
@@ -299,11 +299,11 @@ QTreeWidgetItem *FeedListWidget::createItem(RSS::Item *rssItem, QTreeWidgetItem
 
 void FeedListWidget::fill(QTreeWidgetItem *parent, RSS::Folder *rssParent)
 {
-    for (const auto rssItem : asConst(rssParent->items()))
+    for (auto *rssItem : asConst(rssParent->items()))
     {
         QTreeWidgetItem *item = createItem(rssItem, parent);
         // Recursive call if this is a folder.
-        if (auto folder = qobject_cast<RSS::Folder *>(rssItem))
+        if (auto *folder = qobject_cast<RSS::Folder *>(rssItem))
             fill(item, folder);
     }
 }
diff --git a/src/gui/rss/htmlbrowser.cpp b/src/gui/rss/htmlbrowser.cpp
index d2797192a..28452c387 100644
--- a/src/gui/rss/htmlbrowser.cpp
+++ b/src/gui/rss/htmlbrowser.cpp
@@ -54,10 +54,6 @@ HtmlBrowser::HtmlBrowser(QWidget *parent)
     connect(m_netManager, &QNetworkAccessManager::finished, this, &HtmlBrowser::resourceLoaded);
 }
 
-HtmlBrowser::~HtmlBrowser()
-{
-}
-
 QVariant HtmlBrowser::loadResource(int type, const QUrl &name)
 {
     if (type == QTextDocument::ImageResource)
diff --git a/src/gui/rss/htmlbrowser.h b/src/gui/rss/htmlbrowser.h
index b503f257a..15734483c 100644
--- a/src/gui/rss/htmlbrowser.h
+++ b/src/gui/rss/htmlbrowser.h
@@ -42,7 +42,7 @@ class HtmlBrowser final : public QTextBrowser
 
 public:
     explicit HtmlBrowser(QWidget* parent = nullptr);
-    ~HtmlBrowser();
+    ~HtmlBrowser() = default;
 
     QVariant loadResource(int type, const QUrl &name) override;
 
diff --git a/src/gui/rss/rsswidget.cpp b/src/gui/rss/rsswidget.cpp
index 9069b5301..c341a6e4e 100644
--- a/src/gui/rss/rsswidget.cpp
+++ b/src/gui/rss/rsswidget.cpp
@@ -203,7 +203,7 @@ void RSSWidget::displayItemsListMenu()
     bool hasLink = false;
     for (const QListWidgetItem *item : asConst(m_articleListWidget->selectedItems()))
     {
-        auto article = item->data(Qt::UserRole).value<RSS::Article *>();
+        auto *article = item->data(Qt::UserRole).value<RSS::Article *>();
         Q_ASSERT(article);
 
         if (!article->torrentUrl().isEmpty())
@@ -364,7 +364,7 @@ void RSSWidget::downloadSelectedTorrents()
 {
     for (QListWidgetItem *item : asConst(m_articleListWidget->selectedItems()))
     {
-        auto article = item->data(Qt::UserRole).value<RSS::Article *>();
+        auto *article = item->data(Qt::UserRole).value<RSS::Article *>();
         Q_ASSERT(article);
 
         // Mark as read
@@ -385,7 +385,7 @@ void RSSWidget::openSelectedArticlesUrls()
 {
     for (QListWidgetItem *item : asConst(m_articleListWidget->selectedItems()))
     {
-        auto article = item->data(Qt::UserRole).value<RSS::Article *>();
+        auto *article = item->data(Qt::UserRole).value<RSS::Article *>();
         Q_ASSERT(article);
 
         // Mark as read
@@ -467,7 +467,7 @@ void RSSWidget::copySelectedFeedsURL()
     QStringList URLs;
     for (QTreeWidgetItem *item : asConst(m_feedListWidget->selectedItems()))
     {
-        if (auto feed = qobject_cast<RSS::Feed *>(m_feedListWidget->getRSSItem(item)))
+        if (auto *feed = qobject_cast<RSS::Feed *>(m_feedListWidget->getRSSItem(item)))
             URLs << feed->url();
     }
     qApp->clipboard()->setText(URLs.join(u'\n'));
@@ -496,14 +496,14 @@ void RSSWidget::handleCurrentArticleItemChanged(QListWidgetItem *currentItem, QL
 
     if (previousItem)
     {
-        auto article = m_articleListWidget->getRSSArticle(previousItem);
+        auto *article = m_articleListWidget->getRSSArticle(previousItem);
         Q_ASSERT(article);
         article->markAsRead();
     }
 
     if (!currentItem) return;
 
-    auto article = m_articleListWidget->getRSSArticle(currentItem);
+    auto *article = m_articleListWidget->getRSSArticle(currentItem);
     Q_ASSERT(article);
 
     const QString highlightedBaseColor = m_ui->textBrowser->palette().color(QPalette::Highlight).name();
diff --git a/src/gui/search/searchjobwidget.cpp b/src/gui/search/searchjobwidget.cpp
index 3b7cb37d1..c0320741d 100644
--- a/src/gui/search/searchjobwidget.cpp
+++ b/src/gui/search/searchjobwidget.cpp
@@ -459,7 +459,7 @@ int SearchJobWidget::visibleColumnsCount() const
 
 void SearchJobWidget::displayColumnHeaderMenu()
 {
-    auto menu = new QMenu(this);
+    auto *menu = new QMenu(this);
     menu->setAttribute(Qt::WA_DeleteOnClose);
     menu->setTitle(tr("Column visibility"));
     menu->setToolTipsVisible(true);
diff --git a/src/gui/search/searchwidget.cpp b/src/gui/search/searchwidget.cpp
index 2896f773e..a1ea7c15f 100644
--- a/src/gui/search/searchwidget.cpp
+++ b/src/gui/search/searchwidget.cpp
@@ -144,7 +144,7 @@ SearchWidget::SearchWidget(IGUIApplication *app, MainWindow *mainWindow)
     connect(m_ui->selectPlugin, qOverload<int>(&QComboBox::currentIndexChanged)
             , this, &SearchWidget::fillCatCombobox);
 
-    const auto focusSearchHotkey = new QShortcut(QKeySequence::Find, this);
+    const auto *focusSearchHotkey = new QShortcut(QKeySequence::Find, this);
     connect(focusSearchHotkey, &QShortcut::activated, this, &SearchWidget::toggleFocusBetweenLineEdits);
 }
 
@@ -156,7 +156,7 @@ bool SearchWidget::eventFilter(QObject *object, QEvent *event)
         if (event->type() != QEvent::MouseButtonRelease)
             return false;
 
-        const auto mouseEvent = static_cast<QMouseEvent *>(event);
+        const auto *mouseEvent = static_cast<QMouseEvent *>(event);
         const int tabIndex = m_ui->tabWidget->tabBar()->tabAt(mouseEvent->pos());
         if ((mouseEvent->button() == Qt::MiddleButton) && (tabIndex >= 0))
         {
diff --git a/src/gui/statusbar.cpp b/src/gui/statusbar.cpp
index b4877b692..1d3d8db70 100644
--- a/src/gui/statusbar.cpp
+++ b/src/gui/statusbar.cpp
@@ -255,7 +255,7 @@ void StatusBar::updateAltSpeedsBtn(bool alternative)
 
 void StatusBar::capSpeed()
 {
-    auto dialog = new SpeedLimitDialog {parentWidget()};
+    auto *dialog = new SpeedLimitDialog {parentWidget()};
     dialog->setAttribute(Qt::WA_DeleteOnClose);
     dialog->open();
 }
diff --git a/src/gui/torrentcategorydialog.cpp b/src/gui/torrentcategorydialog.cpp
index ccbc3bd62..36fe38d9a 100644
--- a/src/gui/torrentcategorydialog.cpp
+++ b/src/gui/torrentcategorydialog.cpp
@@ -108,7 +108,7 @@ void TorrentCategoryDialog::editCategory(QWidget *parent, const QString &categor
 
     Q_ASSERT(Session::instance()->categories().contains(categoryName));
 
-    auto dialog = new TorrentCategoryDialog(parent);
+    auto *dialog = new TorrentCategoryDialog(parent);
     dialog->setAttribute(Qt::WA_DeleteOnClose);
     dialog->setCategoryNameEditable(false);
     dialog->setCategoryName(categoryName);
diff --git a/src/gui/torrentcontentwidget.cpp b/src/gui/torrentcontentwidget.cpp
index 58a2fef29..f086516cc 100644
--- a/src/gui/torrentcontentwidget.cpp
+++ b/src/gui/torrentcontentwidget.cpp
@@ -75,7 +75,7 @@ TorrentContentWidget::TorrentContentWidget(QWidget *parent)
     m_filterModel->setSourceModel(m_model);
     QTreeView::setModel(m_filterModel);
 
-    auto itemDelegate = new TorrentContentItemDelegate(this);
+    auto *itemDelegate = new TorrentContentItemDelegate(this);
     setItemDelegate(itemDelegate);
 
     connect(this, &QAbstractItemView::clicked, this, qOverload<const QModelIndex &>(&QAbstractItemView::edit));
@@ -436,7 +436,7 @@ void TorrentContentWidget::openParentFolder(const QModelIndex &index) const
 
 Path TorrentContentWidget::getFullPath(const QModelIndex &index) const
 {
-    const auto contentHandler = m_model->contentHandler();
+    const auto *contentHandler = m_model->contentHandler();
     if (const int fileIdx = getFileIndex(index); fileIdx >= 0)
     {
         const Path fullPath = contentHandler->actualStorageLocation() / contentHandler->actualFilePath(fileIdx);
@@ -450,7 +450,7 @@ Path TorrentContentWidget::getFullPath(const QModelIndex &index) const
 
 void TorrentContentWidget::onItemDoubleClicked(const QModelIndex &index)
 {
-    const auto contentHandler = m_model->contentHandler();
+    const auto *contentHandler = m_model->contentHandler();
     Q_ASSERT(contentHandler && contentHandler->hasMetadata());
 
     if (Q_UNLIKELY(!contentHandler || !contentHandler->hasMetadata()))
diff --git a/src/gui/transferlistfilters/basefilterwidget.h b/src/gui/transferlistfilters/basefilterwidget.h
index bcb2753c8..9f0afecdb 100644
--- a/src/gui/transferlistfilters/basefilterwidget.h
+++ b/src/gui/transferlistfilters/basefilterwidget.h
@@ -56,7 +56,7 @@ private slots:
     virtual void showMenu() = 0;
     virtual void applyFilter(int row) = 0;
     virtual void handleTorrentsLoaded(const QVector<BitTorrent::Torrent *> &torrents) = 0;
-    virtual void torrentAboutToBeDeleted(BitTorrent::Torrent *const) = 0;
+    virtual void torrentAboutToBeDeleted(BitTorrent::Torrent *) = 0;
 
 private:
     TransferListWidget *m_transferList = nullptr;
diff --git a/src/gui/transferlistfilters/categoryfiltermodel.cpp b/src/gui/transferlistfilters/categoryfiltermodel.cpp
index 8229fcc40..99abeef62 100644
--- a/src/gui/transferlistfilters/categoryfiltermodel.cpp
+++ b/src/gui/transferlistfilters/categoryfiltermodel.cpp
@@ -38,13 +38,10 @@
 class CategoryModelItem
 {
 public:
-    CategoryModelItem()
-    {
-    }
+    CategoryModelItem() = default;
 
     CategoryModelItem(CategoryModelItem *parent, QString categoryName, int torrentsCount = 0)
-        : m_parent(nullptr)
-        , m_name(categoryName)
+        : m_name(categoryName)
         , m_torrentsCount(torrentsCount)
     {
         if (parent)
@@ -207,7 +204,7 @@ QVariant CategoryFilterModel::data(const QModelIndex &index, int role) const
 {
     if (!index.isValid()) return {};
 
-    auto item = static_cast<const CategoryModelItem *>(index.internalPointer());
+    const auto *item = static_cast<const CategoryModelItem *>(index.internalPointer());
 
     if ((index.column() == 0) && (role == Qt::DecorationRole))
     {
@@ -251,7 +248,7 @@ QModelIndex CategoryFilterModel::index(int row, int column, const QModelIndex &p
     if (parent.isValid() && (parent.column() != 0))
         return {};
 
-    auto parentItem = parent.isValid() ? static_cast<CategoryModelItem *>(parent.internalPointer())
+    auto *parentItem = parent.isValid() ? static_cast<CategoryModelItem *>(parent.internalPointer())
                                        : m_rootItem;
     if (row < parentItem->childCount())
         return createIndex(row, column, parentItem->childAt(row));
@@ -264,7 +261,7 @@ QModelIndex CategoryFilterModel::parent(const QModelIndex &index) const
     if (!index.isValid())
         return {};
 
-    auto item = static_cast<CategoryModelItem *>(index.internalPointer());
+    auto *item = static_cast<CategoryModelItem *>(index.internalPointer());
     if (!item) return {};
 
     return this->index(item->parent());
@@ -278,7 +275,7 @@ int CategoryFilterModel::rowCount(const QModelIndex &parent) const
     if (!parent.isValid())
         return m_rootItem->childCount();
 
-    auto item = static_cast<CategoryModelItem *>(parent.internalPointer());
+    auto *item = static_cast<CategoryModelItem *>(parent.internalPointer());
     if (!item) return 0;
 
     return item->childCount();
@@ -308,7 +305,7 @@ void CategoryFilterModel::categoryAdded(const QString &categoryName)
 
     if (m_isSubcategoriesEnabled)
     {
-        QStringList expanded = BitTorrent::Session::instance()->expandCategory(categoryName);
+        QStringList expanded = BitTorrent::Session::expandCategory(categoryName);
         if (expanded.count() > 1)
             parent = findItem(expanded[expanded.count() - 2]);
     }
@@ -322,7 +319,7 @@ void CategoryFilterModel::categoryAdded(const QString &categoryName)
 
 void CategoryFilterModel::categoryRemoved(const QString &categoryName)
 {
-    auto item = findItem(categoryName);
+    auto *item = findItem(categoryName);
     if (item)
     {
         QModelIndex i = index(item);
@@ -357,7 +354,7 @@ void CategoryFilterModel::torrentCategoryChanged(BitTorrent::Torrent *const torr
 {
     QModelIndex i;
 
-    auto item = findItem(oldCategory);
+    auto *item = findItem(oldCategory);
     Q_ASSERT(item);
 
     item->decreaseTorrentsCount();
@@ -413,7 +410,7 @@ void CategoryFilterModel::populate()
         for (const QString &categoryName : asConst(session->categories()))
         {
             CategoryModelItem *parent = m_rootItem;
-            for (const QString &subcat : asConst(session->expandCategory(categoryName)))
+            for (const QString &subcat : asConst(BitTorrent::Session::expandCategory(categoryName)))
             {
                 const QString subcatName = shortName(subcat);
                 if (!parent->hasChild(subcatName))
@@ -446,7 +443,7 @@ CategoryModelItem *CategoryFilterModel::findItem(const QString &fullName) const
         return m_rootItem->child(fullName);
 
     CategoryModelItem *item = m_rootItem;
-    for (const QString &subcat : asConst(BitTorrent::Session::instance()->expandCategory(fullName)))
+    for (const QString &subcat : asConst(BitTorrent::Session::expandCategory(fullName)))
     {
         const QString subcatName = shortName(subcat);
         if (!item->hasChild(subcatName)) return nullptr;
diff --git a/src/gui/transferlistfilters/categoryfiltermodel.h b/src/gui/transferlistfilters/categoryfiltermodel.h
index 744f6b319..1ba799f09 100644
--- a/src/gui/transferlistfilters/categoryfiltermodel.h
+++ b/src/gui/transferlistfilters/categoryfiltermodel.h
@@ -63,8 +63,8 @@ private slots:
     void categoryAdded(const QString &categoryName);
     void categoryRemoved(const QString &categoryName);
     void torrentsLoaded(const QVector<BitTorrent::Torrent *> &torrents);
-    void torrentAboutToBeRemoved(BitTorrent::Torrent *const torrent);
-    void torrentCategoryChanged(BitTorrent::Torrent *const torrent, const QString &oldCategory);
+    void torrentAboutToBeRemoved(BitTorrent::Torrent *torrent);
+    void torrentCategoryChanged(BitTorrent::Torrent *torrent, const QString &oldCategory);
     void subcategoriesSupportChanged();
 
 private:
diff --git a/src/gui/transferlistfilters/categoryfilterwidget.cpp b/src/gui/transferlistfilters/categoryfilterwidget.cpp
index a41316ef6..b1f4b22c1 100644
--- a/src/gui/transferlistfilters/categoryfilterwidget.cpp
+++ b/src/gui/transferlistfilters/categoryfilterwidget.cpp
@@ -214,7 +214,7 @@ void CategoryFilterWidget::removeCategory()
 
 void CategoryFilterWidget::removeUnusedCategories()
 {
-    auto session = BitTorrent::Session::instance();
+    auto *session = BitTorrent::Session::instance();
     for (const QString &category : asConst(session->categories()))
     {
         if (model()->data(static_cast<CategoryFilterProxyModel *>(model())->index(category), Qt::UserRole) == 0)
diff --git a/src/gui/transferlistfilters/statusfilterwidget.cpp b/src/gui/transferlistfilters/statusfilterwidget.cpp
index e0caf03f7..9fcb9af3d 100644
--- a/src/gui/transferlistfilters/statusfilterwidget.cpp
+++ b/src/gui/transferlistfilters/statusfilterwidget.cpp
@@ -199,7 +199,7 @@ void StatusFilterWidget::hideZeroItems()
         setCurrentRow(TorrentFilter::All, QItemSelectionModel::SelectCurrent);
 }
 
-void StatusFilterWidget::update(const QVector<BitTorrent::Torrent *> torrents)
+void StatusFilterWidget::update(const QVector<BitTorrent::Torrent *> &torrents)
 {
     for (const BitTorrent::Torrent *torrent : torrents)
         updateTorrentStatus(torrent);
diff --git a/src/gui/transferlistfilters/statusfilterwidget.h b/src/gui/transferlistfilters/statusfilterwidget.h
index 1e13bc0d7..ac1bbd5a5 100644
--- a/src/gui/transferlistfilters/statusfilterwidget.h
+++ b/src/gui/transferlistfilters/statusfilterwidget.h
@@ -54,11 +54,11 @@ private:
     void showMenu() override;
     void applyFilter(int row) override;
     void handleTorrentsLoaded(const QVector<BitTorrent::Torrent *> &torrents) override;
-    void torrentAboutToBeDeleted(BitTorrent::Torrent *const) override;
+    void torrentAboutToBeDeleted(BitTorrent::Torrent *) override;
 
     void configure();
 
-    void update(const QVector<BitTorrent::Torrent *> torrents);
+    void update(const QVector<BitTorrent::Torrent *> &torrents);
     void updateTorrentStatus(const BitTorrent::Torrent *torrent);
     void updateTexts();
     void hideZeroItems();
diff --git a/src/gui/transferlistfilters/tagfiltermodel.h b/src/gui/transferlistfilters/tagfiltermodel.h
index d51addb1b..577530ac8 100644
--- a/src/gui/transferlistfilters/tagfiltermodel.h
+++ b/src/gui/transferlistfilters/tagfiltermodel.h
@@ -61,10 +61,10 @@ public:
 private slots:
     void tagAdded(const QString &tag);
     void tagRemoved(const QString &tag);
-    void torrentTagAdded(BitTorrent::Torrent *const torrent, const QString &tag);
-    void torrentTagRemoved(BitTorrent::Torrent *const, const QString &tag);
+    void torrentTagAdded(BitTorrent::Torrent *torrent, const QString &tag);
+    void torrentTagRemoved(BitTorrent::Torrent *, const QString &tag);
     void torrentsLoaded(const QVector<BitTorrent::Torrent *> &torrents);
-    void torrentAboutToBeRemoved(BitTorrent::Torrent *const torrent);
+    void torrentAboutToBeRemoved(BitTorrent::Torrent *torrent);
 
 private:
     static QString tagDisplayName(const QString &tag);
diff --git a/src/gui/transferlistfilters/tagfilterwidget.cpp b/src/gui/transferlistfilters/tagfilterwidget.cpp
index 1a97b82c0..18b1fb2db 100644
--- a/src/gui/transferlistfilters/tagfilterwidget.cpp
+++ b/src/gui/transferlistfilters/tagfilterwidget.cpp
@@ -208,7 +208,7 @@ void TagFilterWidget::removeTag()
 
 void TagFilterWidget::removeUnusedTags()
 {
-    auto session = BitTorrent::Session::instance();
+    auto *session = BitTorrent::Session::instance();
     for (const QString &tag : asConst(session->tags()))
         if (model()->data(static_cast<TagFilterProxyModel *>(model())->index(tag), Qt::UserRole) == 0)
             session->removeTag(tag);
diff --git a/src/gui/transferlistfilters/trackersfilterwidget.h b/src/gui/transferlistfilters/trackersfilterwidget.h
index 153b6b3ec..0626c65d4 100644
--- a/src/gui/transferlistfilters/trackersfilterwidget.h
+++ b/src/gui/transferlistfilters/trackersfilterwidget.h
@@ -69,7 +69,7 @@ private:
     void showMenu() override;
     void applyFilter(int row) override;
     void handleTorrentsLoaded(const QVector<BitTorrent::Torrent *> &torrents) override;
-    void torrentAboutToBeDeleted(BitTorrent::Torrent *const torrent) override;
+    void torrentAboutToBeDeleted(BitTorrent::Torrent *torrent) override;
 
     void addItems(const QString &trackerURL, const QVector<BitTorrent::TorrentID> &torrents);
     void removeItem(const QString &trackerURL, const BitTorrent::TorrentID &id);
diff --git a/src/gui/transferlistmodel.h b/src/gui/transferlistmodel.h
index 7f42c6aef..f0d7e8ad1 100644
--- a/src/gui/transferlistmodel.h
+++ b/src/gui/transferlistmodel.h
@@ -107,15 +107,15 @@ public:
 
 private slots:
     void addTorrents(const QVector<BitTorrent::Torrent *> &torrents);
-    void handleTorrentAboutToBeRemoved(BitTorrent::Torrent *const torrent);
-    void handleTorrentStatusUpdated(BitTorrent::Torrent *const torrent);
+    void handleTorrentAboutToBeRemoved(BitTorrent::Torrent *torrent);
+    void handleTorrentStatusUpdated(BitTorrent::Torrent *torrent);
     void handleTorrentsUpdated(const QVector<BitTorrent::Torrent *> &torrents);
 
 private:
     void configure();
     QString displayValue(const BitTorrent::Torrent *torrent, int column) const;
     QVariant internalValue(const BitTorrent::Torrent *torrent, int column, bool alt) const;
-    QIcon getIconByState(const BitTorrent::TorrentState state) const;
+    QIcon getIconByState(BitTorrent::TorrentState state) const;
 
     QList<BitTorrent::Torrent *> m_torrentList;  // maps row number to torrent handle
     QHash<BitTorrent::Torrent *, int> m_torrentMap;  // maps torrent handle to row number
diff --git a/src/gui/transferlistwidget.cpp b/src/gui/transferlistwidget.cpp
index 246a72860..0ed31f203 100644
--- a/src/gui/transferlistwidget.cpp
+++ b/src/gui/transferlistwidget.cpp
@@ -335,7 +335,7 @@ void TransferListWidget::setSelectedTorrentsLocation()
 
     const Path oldLocation = torrents[0]->savePath();
 
-    auto fileDialog = new QFileDialog(this, tr("Choose save path"), oldLocation.data());
+    auto *fileDialog = new QFileDialog(this, tr("Choose save path"), oldLocation.data());
     fileDialog->setAttribute(Qt::WA_DeleteOnClose);
     fileDialog->setFileMode(QFileDialog::Directory);
     fileDialog->setOptions(QFileDialog::DontConfirmOverwrite | QFileDialog::ShowDirsOnly | QFileDialog::HideNameFilterDetails);
@@ -616,7 +616,7 @@ void TransferListWidget::setTorrentOptions()
     const QVector<BitTorrent::Torrent *> selectedTorrents = getSelectedTorrents();
     if (selectedTorrents.empty()) return;
 
-    auto dialog = new TorrentOptionsDialog {this, selectedTorrents};
+    auto *dialog = new TorrentOptionsDialog {this, selectedTorrents};
     dialog->setAttribute(Qt::WA_DeleteOnClose);
     dialog->open();
 }
@@ -654,7 +654,7 @@ int TransferListWidget::visibleColumnsCount() const
 // hide/show columns menu
 void TransferListWidget::displayColumnHeaderMenu()
 {
-    auto menu = new QMenu(this);
+    auto *menu = new QMenu(this);
     menu->setAttribute(Qt::WA_DeleteOnClose);
     menu->setTitle(tr("Column visibility"));
     menu->setToolTipsVisible(true);
@@ -767,7 +767,7 @@ void TransferListWidget::editTorrentTrackers()
         }
     }
 
-    auto trackerDialog = new TrackerEntriesDialog(this);
+    auto *trackerDialog = new TrackerEntriesDialog(this);
     trackerDialog->setAttribute(Qt::WA_DeleteOnClose);
     trackerDialog->setTrackers(commonTrackers);
 
@@ -785,7 +785,7 @@ void TransferListWidget::exportTorrent()
     if (getSelectedTorrents().isEmpty())
         return;
 
-    auto fileDialog = new QFileDialog(this, tr("Choose folder to save exported .torrent files"));
+    auto *fileDialog = new QFileDialog(this, tr("Choose folder to save exported .torrent files"));
     fileDialog->setAttribute(Qt::WA_DeleteOnClose);
     fileDialog->setFileMode(QFileDialog::Directory);
     fileDialog->setOptions(QFileDialog::ShowDirsOnly);
diff --git a/src/gui/transferlistwidget.h b/src/gui/transferlistwidget.h
index 5b5be7d61..205b21246 100644
--- a/src/gui/transferlistwidget.h
+++ b/src/gui/transferlistwidget.h
@@ -102,7 +102,7 @@ public slots:
     void renameSelectedTorrent();
 
 signals:
-    void currentTorrentChanged(BitTorrent::Torrent *const torrent);
+    void currentTorrentChanged(BitTorrent::Torrent *torrent);
 
 private slots:
     void torrentDoubleClicked();
diff --git a/src/gui/uithemedialog.cpp b/src/gui/uithemedialog.cpp
index 54f8f86d0..a927e7839 100644
--- a/src/gui/uithemedialog.cpp
+++ b/src/gui/uithemedialog.cpp
@@ -124,7 +124,7 @@ private:
 
     void showColorDialog()
     {
-        auto dialog = new QColorDialog(m_currentColor, this);
+        auto *dialog = new QColorDialog(m_currentColor, this);
         dialog->setAttribute(Qt::WA_DeleteOnClose);
         connect(dialog, &QDialog::accepted, this, [this, dialog]
         {
diff --git a/src/gui/uithemesource.h b/src/gui/uithemesource.h
index bfd89546c..4969c3cee 100644
--- a/src/gui/uithemesource.h
+++ b/src/gui/uithemesource.h
@@ -54,8 +54,8 @@ class UIThemeSource
 public:
     virtual ~UIThemeSource() = default;
 
-    virtual QColor getColor(const QString &colorId, const ColorMode colorMode) const = 0;
-    virtual Path getIconPath(const QString &iconId, const ColorMode colorMode) const = 0;
+    virtual QColor getColor(const QString &colorId, ColorMode colorMode) const = 0;
+    virtual Path getIconPath(const QString &iconId, ColorMode colorMode) const = 0;
     virtual QByteArray readStyleSheet() = 0;
 };
 
@@ -65,8 +65,8 @@ public:
     DefaultThemeSource();
 
     QByteArray readStyleSheet() override;
-    QColor getColor(const QString &colorId, const ColorMode colorMode) const override;
-    Path getIconPath(const QString &iconId, const ColorMode colorMode) const override;
+    QColor getColor(const QString &colorId, ColorMode colorMode) const override;
+    Path getIconPath(const QString &iconId, ColorMode colorMode) const override;
 
 private:
     void loadColors();
@@ -79,8 +79,8 @@ private:
 class CustomThemeSource : public UIThemeSource
 {
 public:
-    QColor getColor(const QString &colorId, const ColorMode colorMode) const override;
-    Path getIconPath(const QString &iconId, const ColorMode colorMode) const override;
+    QColor getColor(const QString &colorId, ColorMode colorMode) const override;
+    Path getIconPath(const QString &iconId, ColorMode colorMode) const override;
     QByteArray readStyleSheet() override;
 
 protected:
diff --git a/src/webui/api/appcontroller.cpp b/src/webui/api/appcontroller.cpp
index f04cbc962..f91521b7c 100644
--- a/src/webui/api/appcontroller.cpp
+++ b/src/webui/api/appcontroller.cpp
@@ -149,7 +149,7 @@ void AppController::preferencesAction()
     QJsonObject nativeDirs;
     for (auto i = watchedFolders.cbegin(); i != watchedFolders.cend(); ++i)
     {
-        const Path watchedFolder = i.key();
+        const Path &watchedFolder = i.key();
         const BitTorrent::AddTorrentParams params = i.value().addTorrentParams;
         if (params.savePath.isEmpty())
             nativeDirs.insert(watchedFolder.toString(), 1);
@@ -616,7 +616,7 @@ void AppController::setPreferencesAction()
         session->setMaxUploadsPerTorrent(it.value().toInt());
 
     // Proxy Server
-    auto proxyManager = Net::ProxyConfigurationManager::instance();
+    auto *proxyManager = Net::ProxyConfigurationManager::instance();
     Net::ProxyConfiguration proxyConf = proxyManager->proxyConfiguration();
     if (hasKey(u"proxy_type"_qs))
         proxyConf.type = Utils::String::toEnum(it.value().toString(), Net::ProxyType::HTTP);
diff --git a/src/webui/api/torrentscontroller.cpp b/src/webui/api/torrentscontroller.cpp
index 529b7b8c0..16ecc789f 100644
--- a/src/webui/api/torrentscontroller.cpp
+++ b/src/webui/api/torrentscontroller.cpp
@@ -1279,7 +1279,7 @@ void TorrentsController::removeCategoriesAction()
 
 void TorrentsController::categoriesAction()
 {
-    const auto session = BitTorrent::Session::instance();
+    const auto *session = BitTorrent::Session::instance();
 
     QJsonObject categories;
     const QStringList categoriesList = session->categories();