Qt Reference Pages

All C++ Classes	If you know the name of the class you want, find it here.
All Classes by Module	A list of all C++ API components in Qt
All Modules	A list of all modules in Qt 6.
All Namespaces	A Qt namespace contains enum types, functions, and sometimes classes.
All QML Modules	A list of all QML modules in Qt.
All QML Types	A list of QML types in this Qt release.
Annotated Class List	If you don't know the name of the class you want, but you know what the class should do, you might try looking here.
Groups Of Related Classes	If you know what kind of class you want (GUI, painting, I.O, etc), look here.
Inheritance Hierarchy	The C++ class inheritance hierarchy for all classes in the Qt API.
Obsolete Classes	Classes and members marked obsolete that should not be used in new code.
Obsolete QML Types	A list of obsolete QML types that should not be used in new code.

<QWaylandQuickExtension>	File includes macros for creating Qt Quick types that correspond to subclasses of QWaylandCompositorExtension and QWaylandObject
<QtAlgorithms>	Includes the generic, template-based algorithms
<QtCompilerDetection>	File includes various compiler-specific macros
<QtEndian>	Functions to convert between little and big endian representations of numbers
<QtGlobal>	File includes an assortment of other headers
<QtMath>	File provides various math functions
<QtProcessorDetection>	File includes various architecture-specific macros
<QtSystemDetection>	File includes various platfrom-specific macros
<qtwebenginecoreglobal.h>	Helper functions for the Qt WebEngine Core module
All Functions and Macros	All documented Qt functions listed alphabetically with a link to where each one is declared.
qfloat16	Provides 16-bit floating point support

There are a number of value-add modules provided by the Qt Company. See Qt Features and Qt Pricing for more information.

Qt for Android	Provides information about Android support in Qt.
Qt for Embedded Linux	Provides information about Embedded Linux support in Qt.
Qt for INTEGRITY	Platform support for INTEGRITY.
Qt for Linux/X11	Platform support for Linux/X11.
Qt for QNX	Platform support for QNX is described here.
Qt for VxWorks	Platform support for VxWorks.
Qt for WebAssembly	Runs Qt applications in a secure sandbox in the browser.
Qt for Windows	Platform support for Windows.
Qt for iOS	Provides insight into Qt's iOS port and how to use it.
Qt for macOS	Platform support for macOS.
Qt for webOS	Platform Support for webOS OSE.