diff --git a/src/app/main.cpp b/src/app/main.cpp
index b4ac0dfee9f..cccb492d242 100644
--- a/src/app/main.cpp
+++ b/src/app/main.cpp
@@ -661,7 +661,7 @@ int main(int argc, char **argv)
     QTranslator translator;
     QTranslator qtTranslator;
     QStringList uiLanguages = QLocale::system().uiLanguages();
-    QString overrideLanguage = settings->value(QLatin1String("General/OverrideLanguage")).toString();
+    QString overrideLanguage = settings->value("General/OverrideLanguage").toString();
     if (!overrideLanguage.isEmpty())
         uiLanguages.prepend(overrideLanguage);
     if (!options.uiLanguage.isEmpty())
diff --git a/src/libs/extensionsystem/pluginmanager.cpp b/src/libs/extensionsystem/pluginmanager.cpp
index c0395115441..503eecadeeb 100644
--- a/src/libs/extensionsystem/pluginmanager.cpp
+++ b/src/libs/extensionsystem/pluginmanager.cpp
@@ -1018,12 +1018,12 @@ void PluginManagerPrivate::writeSettings()
 void PluginManagerPrivate::readSettings()
 {
     if (globalSettings) {
-        defaultDisabledPlugins = globalSettings->value(QLatin1String(C_IGNORED_PLUGINS)).toStringList();
-        defaultEnabledPlugins = globalSettings->value(QLatin1String(C_FORCEENABLED_PLUGINS)).toStringList();
+        defaultDisabledPlugins = globalSettings->value(C_IGNORED_PLUGINS).toStringList();
+        defaultEnabledPlugins = globalSettings->value(C_FORCEENABLED_PLUGINS).toStringList();
     }
     if (settings) {
-        disabledPlugins = settings->value(QLatin1String(C_IGNORED_PLUGINS)).toStringList();
-        forceEnabledPlugins = settings->value(QLatin1String(C_FORCEENABLED_PLUGINS)).toStringList();
+        disabledPlugins = settings->value(C_IGNORED_PLUGINS).toStringList();
+        forceEnabledPlugins = settings->value(C_FORCEENABLED_PLUGINS).toStringList();
     }
 }
 
diff --git a/src/libs/utils/historycompleter.cpp b/src/libs/utils/historycompleter.cpp
index 7f299af1372..8eff3fdad82 100644
--- a/src/libs/utils/historycompleter.cpp
+++ b/src/libs/utils/historycompleter.cpp
@@ -207,10 +207,10 @@ QString HistoryCompleter::historyItem() const
     return d->list.at(0);
 }
 
-bool HistoryCompleter::historyExistsFor(const QString &historyKey)
+bool HistoryCompleter::historyExistsFor(const Key &historyKey)
 {
     QTC_ASSERT(theSettings, return false);
-    const QString fullKey = QLatin1String("CompleterHistory/") + historyKey;
+    const Key fullKey = "CompleterHistory/" + historyKey;
     return theSettings->value(fullKey).isValid();
 }
 
diff --git a/src/libs/utils/historycompleter.h b/src/libs/utils/historycompleter.h
index b0842549fef..4afb3f420ca 100644
--- a/src/libs/utils/historycompleter.h
+++ b/src/libs/utils/historycompleter.h
@@ -23,7 +23,7 @@ public:
     bool removeHistoryItem(int index);
     QString historyItem() const;
     bool hasHistory() const { return historySize() > 0; }
-    static bool historyExistsFor(const QString &historyKey);
+    static bool historyExistsFor(const Key &historyKey);
     void clearHistory();
     void addEntry(const QString &str);
 
diff --git a/src/libs/utils/qtcsettings.h b/src/libs/utils/qtcsettings.h
index 05d44ef2ffd..ba0550c31af 100644
--- a/src/libs/utils/qtcsettings.h
+++ b/src/libs/utils/qtcsettings.h
@@ -16,50 +16,45 @@ class QTCREATOR_UTILS_EXPORT QtcSettings : public QSettings
 public:
     using QSettings::QSettings;
 
+    QVariant value(const Key &key) const { return QSettings::value(stringFromKey(key)); }
+    QVariant value(const Key &key, const QVariant &def) const { return QSettings::value(stringFromKey(key), def); }
+    void setValue(const Key &key, const QVariant &value) { QSettings::setValue(stringFromKey(key), value); }
+    void remove(const Key &key) { QSettings::remove(stringFromKey(key)); }
+    bool contains(const Key &key) const { return QSettings::contains(stringFromKey(key)); }
+
     template<typename T>
-    void setValueWithDefault(const Key &key, const T &val, const T &defaultValue);
-    template<typename T>
-    void setValueWithDefault(const Key &key, const T &val);
+    void setValueWithDefault(const Key &key, const T &val, const T &defaultValue)
+    {
+        setValueWithDefault(this, key, val, defaultValue);
+    }
 
     template<typename T>
     static void setValueWithDefault(QSettings *settings,
                                     const Key &key,
                                     const T &val,
-                                    const T &defaultValue);
+                                    const T &defaultValue)
+    {
+        if (val == defaultValue)
+            settings->remove(stringFromKey(key));
+        else
+            settings->setValue(stringFromKey(key), QVariant::fromValue(val));
+    }
+
+
     template<typename T>
-    static void setValueWithDefault(QSettings *settings, const Key &key, const T &val);
+    void setValueWithDefault(const Key &key, const T &val)
+    {
+        setValueWithDefault(this, key, val);
+    }
+
+    template<typename T>
+    static void setValueWithDefault(QSettings *settings, const Key &key, const T &val)
+    {
+        if (val == T())
+            settings->remove(stringFromKey(key));
+        else
+            settings->setValue(stringFromKey(key), QVariant::fromValue(val));
+    }
 };
 
-template<typename T>
-void QtcSettings::setValueWithDefault(const Key &key, const T &val, const T &defaultValue)
-{
-    setValueWithDefault(this, key, val, defaultValue);
-}
-
-template<typename T>
-void QtcSettings::setValueWithDefault(const Key &key, const T &val)
-{
-    setValueWithDefault(this, key, val);
-}
-
-template<typename T>
-void QtcSettings::setValueWithDefault(QSettings *settings,
-                                      const Key &key,
-                                      const T &val,
-                                      const T &defaultValue)
-{
-    if (val == defaultValue)
-        settings->remove(key);
-    else
-        settings->setValue(key, QVariant::fromValue(val));
-}
-
-template<typename T>
-void QtcSettings::setValueWithDefault(QSettings *settings, const Key &key, const T &val)
-{
-    if (val == T())
-        settings->remove(key);
-    else
-        settings->setValue(key, QVariant::fromValue(val));
-}
 } // namespace Utils
diff --git a/src/libs/utils/store.cpp b/src/libs/utils/store.cpp
index a2cc60c5d2f..96425d8f467 100644
--- a/src/libs/utils/store.cpp
+++ b/src/libs/utils/store.cpp
@@ -116,4 +116,9 @@ bool isStore(const QVariant &value)
     return typeId == QMetaType::QVariantMap || typeId == qMetaTypeId<Store>();
 }
 
+Key numberedKey(const Key &key, int number)
+{
+    return key + Key::number(number);
+}
+
 } // Utils
diff --git a/src/libs/utils/store.h b/src/libs/utils/store.h
index cfebee71cc6..85f677151fa 100644
--- a/src/libs/utils/store.h
+++ b/src/libs/utils/store.h
@@ -29,6 +29,8 @@ QTCREATOR_UTILS_EXPORT QVariantMap mapFromStore(const Store &store);
 
 QTCREATOR_UTILS_EXPORT bool isStore(const QVariant &value);
 
+QTCREATOR_UTILS_EXPORT Key numberedKey(const Key &key, int number);
+
 } // Utils
 
 #ifdef QTC_USE_STORE
diff --git a/src/plugins/clangformat/clangformatsettings.cpp b/src/plugins/clangformat/clangformatsettings.cpp
index 1c76d14df6b..f6be8e922ab 100644
--- a/src/plugins/clangformat/clangformatsettings.cpp
+++ b/src/plugins/clangformat/clangformatsettings.cpp
@@ -6,8 +6,11 @@
 
 #include <coreplugin/icore.h>
 
+using namespace Utils;
+
 namespace ClangFormat {
-static const char FORMAT_CODE_INSTEAD_OF_INDENT_ID[] = "ClangFormat.FormatCodeInsteadOfIndent";
+
+const char FORMAT_CODE_INSTEAD_OF_INDENT_ID[] = "ClangFormat.FormatCodeInsteadOfIndent";
 
 ClangFormatSettings &ClangFormatSettings::instance()
 {
@@ -17,43 +20,37 @@ ClangFormatSettings &ClangFormatSettings::instance()
 
 ClangFormatSettings::ClangFormatSettings()
 {
-    QSettings *settings = Core::ICore::settings();
+    QtcSettings *settings = Core::ICore::settings();
     settings->beginGroup(QLatin1String(Constants::SETTINGS_ID));
-    m_overrideDefaultFile = settings->value(QLatin1String(Constants::OVERRIDE_FILE_ID), false)
-                                .toBool();
-    m_formatWhileTyping = settings->value(QLatin1String(Constants::FORMAT_WHILE_TYPING_ID), false)
-                              .toBool();
-    m_formatOnSave = settings->value(QLatin1String(Constants::FORMAT_CODE_ON_SAVE_ID), false)
-                         .toBool();
-    m_fileSizeThreshold
-        = settings->value(QLatin1String(Constants::FILE_SIZE_THREDSHOLD), 1024).toInt();
+    m_overrideDefaultFile = settings->value(Constants::OVERRIDE_FILE_ID, false).toBool();
+    m_formatWhileTyping = settings->value(Constants::FORMAT_WHILE_TYPING_ID, false).toBool();
+    m_formatOnSave = settings->value(Constants::FORMAT_CODE_ON_SAVE_ID, false).toBool();
+    m_fileSizeThreshold = settings->value(Constants::FILE_SIZE_THREDSHOLD, 1024).toInt();
 
     // Convert old settings to new ones. New settings were added to QtC 8.0
-    bool isOldFormattingOn
-        = settings->value(QLatin1String(FORMAT_CODE_INSTEAD_OF_INDENT_ID), false).toBool();
-    Core::ICore::settings()->remove(QLatin1String(FORMAT_CODE_INSTEAD_OF_INDENT_ID));
+    bool isOldFormattingOn = settings->value(FORMAT_CODE_INSTEAD_OF_INDENT_ID, false).toBool();
+    Core::ICore::settings()->remove(FORMAT_CODE_INSTEAD_OF_INDENT_ID);
 
     if (isOldFormattingOn) {
-        settings->setValue(QLatin1String(Constants::MODE_ID),
+        settings->setValue(Constants::MODE_ID,
                            static_cast<int>(ClangFormatSettings::Mode::Formatting));
         m_mode = ClangFormatSettings::Mode::Formatting;
     } else
         m_mode = static_cast<ClangFormatSettings::Mode>(
-            settings->value(QLatin1String(Constants::MODE_ID), ClangFormatSettings::Mode::Indenting)
-                .toInt());
+            settings->value(Constants::MODE_ID, ClangFormatSettings::Mode::Indenting).toInt());
 
     settings->endGroup();
 }
 
 void ClangFormatSettings::write() const
 {
-    QSettings *settings = Core::ICore::settings();
+    QtcSettings *settings = Core::ICore::settings();
     settings->beginGroup(QLatin1String(Constants::SETTINGS_ID));
-    settings->setValue(QLatin1String(Constants::OVERRIDE_FILE_ID), m_overrideDefaultFile);
-    settings->setValue(QLatin1String(Constants::FORMAT_WHILE_TYPING_ID), m_formatWhileTyping);
-    settings->setValue(QLatin1String(Constants::FORMAT_CODE_ON_SAVE_ID), m_formatOnSave);
-    settings->setValue(QLatin1String(Constants::MODE_ID), static_cast<int>(m_mode));
-    settings->setValue(QLatin1String(Constants::FILE_SIZE_THREDSHOLD), m_fileSizeThreshold);
+    settings->setValue(Constants::OVERRIDE_FILE_ID, m_overrideDefaultFile);
+    settings->setValue(Constants::FORMAT_WHILE_TYPING_ID, m_formatWhileTyping);
+    settings->setValue(Constants::FORMAT_CODE_ON_SAVE_ID, m_formatOnSave);
+    settings->setValue(Constants::MODE_ID, static_cast<int>(m_mode));
+    settings->setValue(Constants::FILE_SIZE_THREDSHOLD, m_fileSizeThreshold);
     settings->endGroup();
 }
 
diff --git a/src/plugins/classview/classviewnavigationwidgetfactory.cpp b/src/plugins/classview/classviewnavigationwidgetfactory.cpp
index 7347bcd806e..91612317be5 100644
--- a/src/plugins/classview/classviewnavigationwidgetfactory.cpp
+++ b/src/plugins/classview/classviewnavigationwidgetfactory.cpp
@@ -9,7 +9,7 @@
 #include <utils/qtcassert.h>
 #include <utils/qtcsettings.h>
 
-#include <QSettings>
+using namespace Utils;
 
 namespace ClassView {
 namespace Internal {
@@ -42,32 +42,30 @@ Core::NavigationView NavigationWidgetFactory::createWidget()
 /*!
    Returns a settings prefix for \a position.
 */
-static QString settingsPrefix(int position)
+static Key settingsPrefix(int position)
 {
-    return QString::fromLatin1("ClassView.Treewidget.%1.FlatMode").arg(position);
+    return numberedKey("ClassView.Treewidget.", position) + ".FlatMode";
 }
 
 //! Flat mode settings
 
-void NavigationWidgetFactory::saveSettings(Utils::QtcSettings *settings,
-                                           int position,
-                                           QWidget *widget)
+void NavigationWidgetFactory::saveSettings(QtcSettings *settings, int position, QWidget *widget)
 {
     auto pw = qobject_cast<NavigationWidget *>(widget);
     QTC_ASSERT(pw, return);
 
     // .beginGroup is not used - to prevent simultaneous access
-    QString settingsGroup = settingsPrefix(position);
+    Key settingsGroup = settingsPrefix(position);
     settings->setValue(settingsGroup, pw->flatMode());
 }
 
-void NavigationWidgetFactory::restoreSettings(Utils::QtcSettings *settings, int position, QWidget *widget)
+void NavigationWidgetFactory::restoreSettings(QtcSettings *settings, int position, QWidget *widget)
 {
     auto pw = qobject_cast<NavigationWidget *>(widget);
     QTC_ASSERT(pw, return);
 
     // .beginGroup is not used - to prevent simultaneous access
-    QString settingsGroup = settingsPrefix(position);
+    Key settingsGroup = settingsPrefix(position);
     pw->setFlatMode(settings->value(settingsGroup, false).toBool());
 }
 
diff --git a/src/plugins/coreplugin/actionmanager/actionmanager.cpp b/src/plugins/coreplugin/actionmanager/actionmanager.cpp
index 54e58dc217a..f17cc76d9ae 100644
--- a/src/plugins/coreplugin/actionmanager/actionmanager.cpp
+++ b/src/plugins/coreplugin/actionmanager/actionmanager.cpp
@@ -490,8 +490,8 @@ void ActionManagerPrivate::readUserSettings(Id id, Command *cmd)
 
 void ActionManagerPrivate::saveSettings(Command *cmd)
 {
-    const QString id = cmd->id().toString();
-    const QString settingsKey = QLatin1String(kKeyboardSettingsKeyV2) + '/' + id;
+    const Key id = cmd->id().toKey();
+    const Key settingsKey = kKeyboardSettingsKeyV2 + '/' + id;
     const QList<QKeySequence> keys = cmd->keySequences();
     const QList<QKeySequence> defaultKeys = cmd->defaultKeySequences();
     if (keys != defaultKeys) {
diff --git a/src/plugins/coreplugin/dialogs/newdialogwidget.cpp b/src/plugins/coreplugin/dialogs/newdialogwidget.cpp
index 545ca9c4169..ca616c8b65c 100644
--- a/src/plugins/coreplugin/dialogs/newdialogwidget.cpp
+++ b/src/plugins/coreplugin/dialogs/newdialogwidget.cpp
@@ -327,8 +327,8 @@ void NewDialogWidget::showDialog()
 {
     QModelIndex idx;
 
-    QString lastPlatform = ICore::settings()->value(QLatin1String(LAST_PLATFORM_KEY)).toString();
-    QString lastCategory = ICore::settings()->value(QLatin1String(LAST_CATEGORY_KEY)).toString();
+    QString lastPlatform = ICore::settings()->value(LAST_PLATFORM_KEY).toString();
+    QString lastCategory = ICore::settings()->value(LAST_CATEGORY_KEY).toString();
 
     if (!lastPlatform.isEmpty()) {
         int index = m_comboBox->findData(lastPlatform);
diff --git a/src/plugins/coreplugin/foldernavigationwidget.cpp b/src/plugins/coreplugin/foldernavigationwidget.cpp
index 562c2a8155b..6cee44c5917 100644
--- a/src/plugins/coreplugin/foldernavigationwidget.cpp
+++ b/src/plugins/coreplugin/foldernavigationwidget.cpp
@@ -861,7 +861,7 @@ void FolderNavigationWidgetFactory::restoreSettings(QtcSettings *settings, int p
 {
     auto fnw = qobject_cast<FolderNavigationWidget *>(widget);
     QTC_ASSERT(fnw, return);
-    const QString base = kSettingsBase + QString::number(position);
+    const Key base = kSettingsBase + Key::number(position);
     fnw->setHiddenFilesFilter(settings->value(base + kHiddenFilesKey, kHiddenFilesDefault).toBool());
     fnw->setAutoSynchronization(settings->value(base + kSyncKey, kAutoSyncDefault).toBool());
     fnw->setShowBreadCrumbs(
diff --git a/src/plugins/coreplugin/generalsettings.cpp b/src/plugins/coreplugin/generalsettings.cpp
index 13f853e7592..4cc865de8ea 100644
--- a/src/plugins/coreplugin/generalsettings.cpp
+++ b/src/plugins/coreplugin/generalsettings.cpp
@@ -263,7 +263,7 @@ QString GeneralSettingsWidget::language()
 void GeneralSettingsWidget::setLanguage(const QString &locale)
 {
     QtcSettings *settings = ICore::settings();
-    if (settings->value(QLatin1String("General/OverrideLanguage")).toString() != locale) {
+    if (settings->value("General/OverrideLanguage").toString() != locale) {
         RestartDialog dialog(ICore::dialogParent(),
                              Tr::tr("The language change will take effect after restart."));
         dialog.exec();
diff --git a/src/plugins/debugger/debuggerplugin.cpp b/src/plugins/debugger/debuggerplugin.cpp
index 42c5244cd57..f155365bd7e 100644
--- a/src/plugins/debugger/debuggerplugin.cpp
+++ b/src/plugins/debugger/debuggerplugin.cpp
@@ -1477,12 +1477,12 @@ void DebuggerPluginPrivate::parseCommandLineArguments()
         QTimer::singleShot(0, this, &DebuggerPluginPrivate::runScheduled);
 }
 
-static void setConfigValue(const QString &name, const QVariant &value)
+static void setConfigValue(const Key &name, const QVariant &value)
 {
     ICore::settings()->setValue("DebugMode/" + name, value);
 }
 
-static QVariant configValue(const QString &name)
+static QVariant configValue(const Key &name)
 {
     return ICore::settings()->value("DebugMode/" + name);
 }
@@ -1658,7 +1658,7 @@ void DebuggerPluginPrivate::reloadDebuggingHelpers()
 
 void DebuggerPluginPrivate::startRemoteCdbSession()
 {
-    const QString connectionKey = "CdbRemoteConnection";
+    const Key connectionKey = "CdbRemoteConnection";
     Kit *kit = findUniversalCdbKit();
     QTC_ASSERT(kit, return);
 
diff --git a/src/plugins/designer/settingsmanager.cpp b/src/plugins/designer/settingsmanager.cpp
index f533d401072..1cef5f4b074 100644
--- a/src/plugins/designer/settingsmanager.cpp
+++ b/src/plugins/designer/settingsmanager.cpp
@@ -4,12 +4,20 @@
 #include "settingsmanager.h"
 
 #include <coreplugin/icore.h>
+
 #include <utils/qtcassert.h>
 
-#include <QSettings>
-#include <QDebug>
+using namespace Utils;
 
-using namespace Designer::Internal;
+namespace Designer::Internal {
+
+static Key addPrefix(const QString &name)
+{
+    Key result = keyFromString(name);
+    if (Core::ICore::settings()->group().isEmpty())
+        result.prepend("Designer");
+    return result;
+}
 
 void SettingsManager::beginGroup(const QString &prefix)
 {
@@ -41,10 +49,4 @@ void SettingsManager::remove(const QString &key)
     Core::ICore::settings()->remove(addPrefix(key));
 }
 
-QString SettingsManager::addPrefix(const QString &name) const
-{
-    QString result = name;
-    if (Core::ICore::settings()->group().isEmpty())
-        result.prepend("Designer");
-    return result;
-}
+} // Designer::Internal
diff --git a/src/plugins/designer/settingsmanager.h b/src/plugins/designer/settingsmanager.h
index 633e58d117d..06ce37a98cb 100644
--- a/src/plugins/designer/settingsmanager.h
+++ b/src/plugins/designer/settingsmanager.h
@@ -21,9 +21,6 @@ public:
     void setValue(const QString &key, const QVariant &value) override;
     QVariant value(const QString &key, const QVariant &defaultValue = QVariant()) const override;
     void remove(const QString &key) override;
-
-private:
-    QString addPrefix(const QString &name) const;
 };
 
 } // namespace Internal
diff --git a/src/plugins/help/helpmanager.cpp b/src/plugins/help/helpmanager.cpp
index 3c053662d54..f971f825689 100644
--- a/src/plugins/help/helpmanager.cpp
+++ b/src/plugins/help/helpmanager.cpp
@@ -29,13 +29,14 @@
 #include <QtHelp/QHelpLink>
 
 using namespace Core;
-
-static const char kUserDocumentationKey[] = "Help/UserDocumentation";
-static const char kUpdateDocumentationTask[] = "UpdateDocumentationTask";
+using namespace Utils;
 
 namespace Help {
 namespace Internal {
 
+const char kUserDocumentationKey[] = "Help/UserDocumentation";
+const char kUpdateDocumentationTask[] = "UpdateDocumentationTask";
+
 struct HelpManagerPrivate
 {
     HelpManagerPrivate() = default;
@@ -357,8 +358,8 @@ HelpManagerPrivate::~HelpManagerPrivate()
 
 const QStringList HelpManagerPrivate::documentationFromInstaller()
 {
-    QSettings *installSettings = ICore::settings();
-    const QStringList documentationPaths = installSettings->value(QLatin1String("Help/InstalledDocumentation"))
+    QtcSettings *installSettings = ICore::settings();
+    const QStringList documentationPaths = installSettings->value("Help/InstalledDocumentation")
             .toStringList();
     QStringList documentationFiles;
     for (const QString &path : documentationPaths) {
@@ -377,8 +378,7 @@ const QStringList HelpManagerPrivate::documentationFromInstaller()
 
 void HelpManagerPrivate::readSettings()
 {
-    m_userRegisteredFiles = Utils::toSet(ICore::settings()->value(QLatin1String(kUserDocumentationKey))
-            .toStringList());
+    m_userRegisteredFiles = Utils::toSet(ICore::settings()->value(kUserDocumentationKey).toStringList());
 }
 
 void HelpManagerPrivate::writeSettings()
diff --git a/src/plugins/help/helpplugin.cpp b/src/plugins/help/helpplugin.cpp
index 0b3ad2f011c..346b2858d22 100644
--- a/src/plugins/help/helpplugin.cpp
+++ b/src/plugins/help/helpplugin.cpp
@@ -249,7 +249,7 @@ HelpPluginPrivate::HelpPluginPrivate()
                     Core::HelpManager::HelpModeAlways);
     });
 
-    const QString qdsStandaloneEntry = "QML/Designer/StandAloneMode"; //entry from designer settings
+    const Key qdsStandaloneEntry = "QML/Designer/StandAloneMode"; //entry from designer settings
     const bool isDesigner = Core::ICore::settings()->value(qdsStandaloneEntry, false).toBool();
 
     action = new QAction(Tr::tr("Report Bug..."), this);
diff --git a/src/plugins/projectexplorer/devicesupport/devicesettingspage.cpp b/src/plugins/projectexplorer/devicesupport/devicesettingspage.cpp
index 4e40255b468..9398294912b 100644
--- a/src/plugins/projectexplorer/devicesupport/devicesettingspage.cpp
+++ b/src/plugins/projectexplorer/devicesupport/devicesettingspage.cpp
@@ -221,8 +221,7 @@ DeviceSettingsWidget::DeviceSettingsWidget()
 
     addButton->setEnabled(hasDeviceFactories);
 
-    int lastIndex = ICore::settings()
-        ->value(QLatin1String(LastDeviceIndexKey), 0).toInt();
+    int lastIndex = ICore::settings()->value(LastDeviceIndexKey, 0).toInt();
     if (lastIndex == -1)
         lastIndex = 0;
     if (lastIndex < m_configurationComboBox->count())
diff --git a/src/plugins/projectexplorer/jsonwizard/jsonfieldpage.cpp b/src/plugins/projectexplorer/jsonwizard/jsonfieldpage.cpp
index e3a522a3e40..52f3b2bc59a 100644
--- a/src/plugins/projectexplorer/jsonwizard/jsonfieldpage.cpp
+++ b/src/plugins/projectexplorer/jsonwizard/jsonfieldpage.cpp
@@ -76,6 +76,11 @@ static void warnAboutUnsupportedKeys(const QVariantMap &map, const QString &name
     }
 }
 
+static Key fullSettingsKey(const QString &fieldKey)
+{
+    return "Wizards/" + keyFromString(fieldKey);
+}
+
 
 // --------------------------------------------------------------------
 // Helper:
@@ -1413,9 +1418,4 @@ JsonFieldPage::Field *JsonFieldPage::createFieldData(const QString &type)
     return nullptr;
 }
 
-QString JsonFieldPage::fullSettingsKey(const QString &fieldKey)
-{
-    return "Wizards/" + fieldKey;
-}
-
 } // namespace ProjectExplorer
diff --git a/src/plugins/projectexplorer/jsonwizard/jsonfieldpage.h b/src/plugins/projectexplorer/jsonwizard/jsonfieldpage.h
index 69ba2a50fe5..578d16c711e 100644
--- a/src/plugins/projectexplorer/jsonwizard/jsonfieldpage.h
+++ b/src/plugins/projectexplorer/jsonwizard/jsonfieldpage.h
@@ -126,7 +126,6 @@ private:
     static QHash<QString, FieldFactory> m_factories;
 
     static Field *createFieldData(const QString &type);
-    static QString fullSettingsKey(const QString &fieldKey);
 
     QFormLayout *m_formLayout;
     QLabel *m_errorLabel;
diff --git a/src/plugins/projectexplorer/projectexplorer.cpp b/src/plugins/projectexplorer/projectexplorer.cpp
index 8a8c835e21d..06df7b90d4b 100644
--- a/src/plugins/projectexplorer/projectexplorer.cpp
+++ b/src/plugins/projectexplorer/projectexplorer.cpp
@@ -2216,7 +2216,7 @@ void ProjectExplorerPluginPrivate::savePersistentSettings()
     }
 
     QtcSettings *s = ICore::settings();
-    s->remove(QLatin1String("ProjectExplorer/RecentProjects/Files"));
+    s->remove("ProjectExplorer/RecentProjects/Files");
 
     QStringList fileNames;
     QStringList displayNames;
diff --git a/src/plugins/projectexplorer/projecttreewidget.cpp b/src/plugins/projectexplorer/projecttreewidget.cpp
index c59761cd169..c3b86ce4206 100644
--- a/src/plugins/projectexplorer/projecttreewidget.cpp
+++ b/src/plugins/projectexplorer/projecttreewidget.cpp
@@ -661,7 +661,7 @@ void ProjectTreeWidgetFactory::restoreSettings(QtcSettings *settings, int positi
 {
     auto ptw = qobject_cast<ProjectTreeWidget *>(widget);
     Q_ASSERT(ptw);
-    const QString baseKey = kBaseKey + QString::number(position);
+    const Key baseKey = kBaseKey + Key::number(position);
     ptw->setProjectFilter(
         settings->value(baseKey + kProjectFilterKey, kProjectFilterDefault).toBool());
     ptw->setGeneratedFilesFilter(
diff --git a/src/plugins/projectexplorer/toolchainmanager.cpp b/src/plugins/projectexplorer/toolchainmanager.cpp
index d7f20d6f0f5..a0ae2d1cbe9 100644
--- a/src/plugins/projectexplorer/toolchainmanager.cpp
+++ b/src/plugins/projectexplorer/toolchainmanager.cpp
@@ -62,7 +62,7 @@ using namespace Internal;
 
 const char DETECT_X64_AS_X32_KEY[] = "ProjectExplorer/Toolchains/DetectX64AsX32";
 
-static QString badToolchainsKey() { return {"BadToolChains"}; }
+static Key badToolchainsKey() { return "BadToolChains"; }
 
 // --------------------------------------------------------------------------
 // ToolChainManager
diff --git a/src/plugins/qmakeprojectmanager/wizards/qtwizard.cpp b/src/plugins/qmakeprojectmanager/wizards/qtwizard.cpp
index 2e1a6baf9bc..fbfa7cee520 100644
--- a/src/plugins/qmakeprojectmanager/wizards/qtwizard.cpp
+++ b/src/plugins/qmakeprojectmanager/wizards/qtwizard.cpp
@@ -29,6 +29,7 @@
 
 using namespace ProjectExplorer;
 using namespace QtSupport;
+using namespace Utils;
 
 namespace QmakeProjectManager {
 namespace Internal {
@@ -88,9 +89,9 @@ QString QtWizard::templateDir()
 
 bool QtWizard::lowerCaseFiles()
 {
-    QString lowerCaseSettingsKey = QLatin1String(CppEditor::Constants::CPPEDITOR_SETTINGSGROUP);
-    lowerCaseSettingsKey += QLatin1Char('/');
-    lowerCaseSettingsKey += QLatin1String(CppEditor::Constants::LOWERCASE_CPPFILES_KEY);
+    Key lowerCaseSettingsKey = CppEditor::Constants::CPPEDITOR_SETTINGSGROUP;
+    lowerCaseSettingsKey += '/';
+    lowerCaseSettingsKey += CppEditor::Constants::LOWERCASE_CPPFILES_KEY;
     const bool lowerCaseDefault = CppEditor::Constants::LOWERCASE_CPPFILES_DEFAULT;
     return Core::ICore::settings()->value(lowerCaseSettingsKey, QVariant(lowerCaseDefault)).toBool();
 }
diff --git a/src/plugins/qmldesignerbase/studio/studiosettingspage.cpp b/src/plugins/qmldesignerbase/studio/studiosettingspage.cpp
index d94efbd666b..d88c4cf409b 100644
--- a/src/plugins/qmldesignerbase/studio/studiosettingspage.cpp
+++ b/src/plugins/qmldesignerbase/studio/studiosettingspage.cpp
@@ -178,15 +178,15 @@ void StudioSettingsPage::apply()
     QSettings *s = Core::ICore::settings();
     const QString value = m_pathChooserExamples->filePath().toString();
 
-    if (s->value(Paths::exampleDownloadPath.toString(), false).toString() != value) {
-        s->setValue(Paths::exampleDownloadPath.toString(), value);
+    if (s->value(Paths::exampleDownloadPath, false).toString() != value) {
+        s->setValue(Paths::exampleDownloadPath, value);
         emit examplesDownloadPathChanged(value);
     }
 
     const QString bundlesPath = m_pathChooserBundles->filePath().toString();
 
-    if (s->value(Paths::bundlesDownloadPath.toString()).toString() != bundlesPath) {
-        s->setValue(Paths::bundlesDownloadPath.toString(), bundlesPath);
+    if (s->value(Paths::bundlesDownloadPath).toString() != bundlesPath) {
+        s->setValue(Paths::bundlesDownloadPath, bundlesPath);
         emit bundlesDownloadPathChanged(bundlesPath);
 
         const QString restartText = tr("Changing bundle path will take effect after restart.");
diff --git a/src/plugins/qmldesignerbase/utils/designerpaths.cpp b/src/plugins/qmldesignerbase/utils/designerpaths.cpp
index 53b4b7ea37e..da4ce8ce082 100644
--- a/src/plugins/qmldesignerbase/utils/designerpaths.cpp
+++ b/src/plugins/qmldesignerbase/utils/designerpaths.cpp
@@ -30,15 +30,13 @@ Utils::FilePath defaultBundlesPath()
 
 QString examplesPathSetting()
 {
-    return Core::ICore::settings()
-        ->value(exampleDownloadPath.toString(), defaultExamplesPath().toString())
+    return Core::ICore::settings()->value(exampleDownloadPath, defaultExamplesPath().toString())
         .toString();
 }
 
 QString bundlesPathSetting()
 {
-    return Core::ICore::settings()
-        ->value(bundlesDownloadPath.toString(), defaultBundlesPath().toString())
+    return Core::ICore::settings()->value(bundlesDownloadPath, defaultBundlesPath().toString())
         .toString();
 }
 
diff --git a/src/plugins/qmldesignerbase/utils/designerpaths.h b/src/plugins/qmldesignerbase/utils/designerpaths.h
index df53997457f..b038343b25e 100644
--- a/src/plugins/qmldesignerbase/utils/designerpaths.h
+++ b/src/plugins/qmldesignerbase/utils/designerpaths.h
@@ -9,8 +9,8 @@
 
 namespace QmlDesigner::Paths {
 
-inline constexpr QStringView exampleDownloadPath = u"StudioConfig/ExamplesDownloadPath";
-inline constexpr QStringView bundlesDownloadPath = u"StudioConfig/BundlesDownloadPath";
+constexpr char exampleDownloadPath[] = "StudioConfig/ExamplesDownloadPath";
+constexpr char bundlesDownloadPath[] = "StudioConfig/BundlesDownloadPath";
 
 QMLDESIGNERBASE_EXPORT Utils::FilePath defaultExamplesPath();
 QMLDESIGNERBASE_EXPORT Utils::FilePath defaultBundlesPath();
diff --git a/src/plugins/qtsupport/exampleslistmodel.cpp b/src/plugins/qtsupport/exampleslistmodel.cpp
index 0def03b90b6..bb2f9e0fa00 100644
--- a/src/plugins/qtsupport/exampleslistmodel.cpp
+++ b/src/plugins/qtsupport/exampleslistmodel.cpp
@@ -49,13 +49,13 @@ Q_GLOBAL_STATIC_WITH_ARGS(QVersionNumber, minQtVersionForCategories, (6, 5, 1));
 
 void ExampleSetModel::writeCurrentIdToSettings(int currentIndex) const
 {
-    QSettings *settings = Core::ICore::settings();
-    settings->setValue(QLatin1String(kSelectedExampleSetKey), getId(currentIndex));
+    QtcSettings *settings = Core::ICore::settings();
+    settings->setValue(kSelectedExampleSetKey, getId(currentIndex));
 }
 
 int ExampleSetModel::readCurrentIndexFromSettings() const
 {
-    QVariant id = Core::ICore::settings()->value(QLatin1String(kSelectedExampleSetKey));
+    QVariant id = Core::ICore::settings()->value(kSelectedExampleSetKey);
     for (int i=0; i < rowCount(); i++) {
         if (id == getId(i))
             return i;
diff --git a/src/plugins/scxmleditor/common/colorpicker.cpp b/src/plugins/scxmleditor/common/colorpicker.cpp
index 88f4d6d22a7..a367ebbd7d0 100644
--- a/src/plugins/scxmleditor/common/colorpicker.cpp
+++ b/src/plugins/scxmleditor/common/colorpicker.cpp
@@ -12,7 +12,9 @@
 #include <QHBoxLayout>
 #include <QToolButton>
 
-using namespace ScxmlEditor::Common;
+using namespace Utils;
+
+namespace ScxmlEditor::Common {
 
 const char C_SETTINGS_COLORPICKER_LASTUSEDCOLORS[] = "ScxmlEditor/ColorPickerLastUsedColors_%1";
 constexpr int C_BUTTON_COLUMNS_COUNT = 5;
@@ -55,15 +57,15 @@ ColorPicker::ColorPicker(const QString &key, QWidget *parent)
     }.attachTo(this);
 
     const QStringList lastColors = Core::ICore::settings()->value(
-                QString::fromLatin1(C_SETTINGS_COLORPICKER_LASTUSEDCOLORS).arg(m_key), QStringList()).toStringList();
+        C_SETTINGS_COLORPICKER_LASTUSEDCOLORS + keyFromString(m_key), QStringList()).toStringList();
     for (int i = lastColors.count(); i--;)
         setLastUsedColor(lastColors[i]);
 }
 
 ColorPicker::~ColorPicker()
 {
-    Core::ICore::settings()->setValue(QString::fromLatin1(C_SETTINGS_COLORPICKER_LASTUSEDCOLORS).arg(m_key),
-                                      m_lastUsedColorNames);
+    Core::ICore::settings()->setValue(
+        C_SETTINGS_COLORPICKER_LASTUSEDCOLORS + keyFromString(m_key), m_lastUsedColorNames);
 }
 
 void ColorPicker::setLastUsedColor(const QString &colorName)
@@ -99,3 +101,5 @@ QToolButton *ColorPicker::createButton(const QColor &color)
 
     return button;
 }
+
+} // ScxmlEditor::Common
diff --git a/src/plugins/scxmleditor/common/colorpicker.h b/src/plugins/scxmleditor/common/colorpicker.h
index 1576e8a9116..73399068904 100644
--- a/src/plugins/scxmleditor/common/colorpicker.h
+++ b/src/plugins/scxmleditor/common/colorpicker.h
@@ -10,9 +10,7 @@ class QHBoxLayout;
 class QToolButton;
 QT_END_NAMESPACE
 
-namespace ScxmlEditor {
-
-namespace Common {
+namespace ScxmlEditor::Common {
 
 class ColorPicker : public QFrame
 {
@@ -37,5 +35,4 @@ private:
     QHBoxLayout *m_lastUsedColorContainer;
 };
 
-} // namespace Common
-} // namespace ScxmlEditor
+} // namespace ScxmlEditor::Common
diff --git a/src/plugins/studiowelcome/examplecheckout.cpp b/src/plugins/studiowelcome/examplecheckout.cpp
index 52ad72ce8a8..7b13c59fa88 100644
--- a/src/plugins/studiowelcome/examplecheckout.cpp
+++ b/src/plugins/studiowelcome/examplecheckout.cpp
@@ -57,7 +57,7 @@ void DataModelDownloader::usageStatisticsDownloadExample(const QString &name)
 
 bool DataModelDownloader::downloadEnabled() const
 {
-    const QString lastQDSVersionEntry = "QML/Designer/EnableWelcomePageDownload";
+    const Key lastQDSVersionEntry = "QML/Designer/EnableWelcomePageDownload";
     return Core::ICore::settings()->value(lastQDSVersionEntry, false).toBool();
 }
 
diff --git a/src/plugins/studiowelcome/studiowelcomeplugin.cpp b/src/plugins/studiowelcome/studiowelcomeplugin.cpp
index a794a2c3fc3..927ad2f3c35 100644
--- a/src/plugins/studiowelcome/studiowelcomeplugin.cpp
+++ b/src/plugins/studiowelcome/studiowelcomeplugin.cpp
@@ -516,7 +516,7 @@ void StudioWelcomePlugin::initialize()
 
 static bool forceDownLoad()
 {
-    const QString lastQDSVersionEntry = "QML/Designer/ForceWelcomePageDownload";
+    const Key lastQDSVersionEntry = "QML/Designer/ForceWelcomePageDownload";
     return Core::ICore::settings()->value(lastQDSVersionEntry, false).toBool();
 }
 
diff --git a/src/plugins/texteditor/findinfiles.cpp b/src/plugins/texteditor/findinfiles.cpp
index 8156c10b18c..d780d1b1fbd 100644
--- a/src/plugins/texteditor/findinfiles.cpp
+++ b/src/plugins/texteditor/findinfiles.cpp
@@ -143,10 +143,10 @@ QWidget *FindInFiles::createConfigWidget()
                 [this] { setSearchDir(m_directory->filePath()); });
         connect(this, &BaseFileFind::searchDirChanged, m_directory, &PathChooser::setFilePath);
         m_directory->setHistoryCompleter(HistoryKey, /*restoreLastItemFromHistory=*/ true);
-        if (!HistoryCompleter::historyExistsFor(QLatin1String(HistoryKey))) {
+        if (!HistoryCompleter::historyExistsFor(HistoryKey)) {
             auto completer = static_cast<HistoryCompleter *>(m_directory->lineEdit()->completer());
             const QStringList legacyHistory = ICore::settings()->value(
-                        QLatin1String("Find/FindInFiles/directories")).toStringList();
+                        "Find/FindInFiles/directories").toStringList();
             for (const QString &dir: legacyHistory)
                 completer->addEntry(dir);
         }
diff --git a/src/shared/help/bookmarkmanager.cpp b/src/shared/help/bookmarkmanager.cpp
index 72bd5db3214..2f287f2d310 100644
--- a/src/shared/help/bookmarkmanager.cpp
+++ b/src/shared/help/bookmarkmanager.cpp
@@ -600,7 +600,7 @@ void BookmarkManager::saveBookmarks()
     QDataStream stream(&bookmarks, QIODevice::WriteOnly);
 
     readBookmarksRecursive(treeModel->invisibleRootItem(), stream, 0);
-    Core::ICore::settings()->setValue(QLatin1String(kBookmarksKey), bookmarks);
+    Core::ICore::settings()->setValue(kBookmarksKey, bookmarks);
 }
 
 QStringList BookmarkManager::bookmarkFolders() const