All Modules

Qt Essentials

Qt Essentials define the foundation of Qt on all platforms. They are available on all supported development platforms and on the tested target platforms. Except the testing modules, which will remain source compatible, these modules will remain source and binary compatible throughout Qt 6.

Essential modules are general and useful for a majority of Qt applications. A module that is used for a special purpose is considered an add-on module even if it is available on all supported platforms.

The following table lists the Qt essentials:

Qt CoreCore non-graphical classes used by other modules.
Qt D-BusClasses for inter-process communication over the D-Bus protocol.
Qt GUIBase classes for graphical user interface (GUI) components.
Qt NetworkClasses to make network programming easier and more portable.
Qt QmlClasses for QML and JavaScript languages.
Qt QuickA declarative framework for building highly dynamic applications with custom user interfaces.
Qt Quick ControlsProvides lightweight QML types for creating performant user interfaces for desktop, embedded, and mobile devices. These types employ a simple styling architecture and are very efficient.
Qt Quick DialogsTypes for creating and interacting with system dialogs from a Qt Quick application.
Qt Quick LayoutsLayouts are items that are used to arrange Qt Quick 2 based items in the user interface.
Qt Quick TestA unit test framework for QML applications, where the test cases are written as JavaScript functions.

Note: The binary compatibility guarantee does not apply to Qt Quick Test. However, it will remain source compatible.

Qt TestClasses for unit testing Qt applications and libraries.

Note: The binary compatibility guarantee does not apply to Qt Test. However, it will remain source compatible.

Qt WidgetsClasses to extend Qt GUI with C++ widgets.

Qt Add-Ons

Qt Add-On modules bring additional value for specific purposes. These modules may only be available on some development platform. Many add-on modules are either feature-complete and exist for backwards compatibility, or are only applicable to certain platforms. Each add-on module specifies its compatibility promise separately.

The Qt installers include the option of downloading the add-ons. For more information, visit the Getting Started with Qt page.

The following table lists the Qt add-ons:

ModuleDevelopment PlatformsTarget PlatformsDescription
Active QtWindowsWindowsClasses for applications which use ActiveX and COM
Qt 3DAllAllFunctionality for near-realtime simulation systems with support for 2D and 3D rendering.
Qt 5 Core Compatibility APIsAllAllQt Core APIs that were in Qt 5 but not Qt 6.
Qt BluetoothAllAndroid, iOS, Linux, Boot to Qt, macOS and WindowsProvides access to Bluetooth hardware.
Qt ConcurrentAllAllClasses for writing multi-threaded programs without using low-level threading primitives.
Qt HelpAllAllClasses for integrating documentation into applications.
Qt Image FormatsAllAllPlugins for additional image formats: TIFF, MNG, TGA, WBMP.
Qt MultimediaAllAll*A rich set of QML types and C++ classes to handle multimedia content. Also includes APIs to handle camera access.
Qt NFCAllAndroid, iOS, macOS, Linux and WindowsProvides access to Near-Field communication (NFC) hardware. On desktop platforms NDEF access is only supported for Type 4 tags.
Qt OPC UAAllAll (except QNX, WebAssembly)Protocol for data modeling and exchange of data in industrial applications.
Qt OpenGLAllAllC++ classes that make it easy to use OpenGL in Qt applications. A separate library of Qt OpenGL Widgets C++ Classes provides a widget for rendering OpenGL graphics.
Qt PDFAllWindows, Linux, and macOS.Classes and functions for rendering PDF documents.
Qt PositioningAllAndroid, iOS, macOS, Linux and WindowsProvides access to position, satellite info and area monitoring classes.
Qt Print SupportAllAll (except iOS)Classes to make printing easier and more portable.
Qt Quick WidgetsAllAllProvides a C++ widget class for displaying a Qt Quick user interface.
Qt Quick EffectsAllAllProvides QML types for applying one or more simple graphical effects to Qt Quick items.
Qt Quick ParticlesAllAllProvides QML types for particle effects.
Qt Remote ObjectsAllAllProvides an easy to use mechanism for sharing a QObject's API (Properties/Signals/Slots) between processes or devices.
Qt SCXMLAllAllProvides classes and tools for creating state machines from SCXML files and embedding them in applications.
Qt SensorsAllAndroid, iOS, and WindowsProvides access to sensor hardware.
Qt Serial BusAllLinux, Boot to Qt, macOS and WindowsProvides access to serial industrial bus interfaces. Currently, the module supports the CAN bus and Modbus protocols.
Qt Serial PortAllLinux, Boot to Qt, macOS and WindowsProvides classes to interact with hardware and virtual serial ports.
Qt Shader ToolsAllAllProvides tools for the cross-platform Qt shader pipeline. These enable processing graphics and compute shaders to make them usable for Qt Quick and other components in the Qt ecosystem.
Qt Spatial AudioAllAllProvides support for spatial audio. Create sound scenes in 3D space containing different sound sources and room related properties such as reverb.
Qt SQLAllAllClasses for database integration using SQL.
Qt State MachineAllAllProvides classes for creating and executing state graphs.
Qt SVGAllAllClasses for displaying the contents of SVG files. Supports a subset of the SVG 1.2 Tiny standard. A separate library of Qt SVG Widgets C++ Classes provides support for rendering SVG files in a widget UI.
Qt TextToSpeechAllAllProvides support for synthesizing speech from text and playing it as audio output.
Qt UI ToolsAllAllClasses for loading QWidget based forms created in Qt Designer dynamically, at runtime.
Qt WebChannelAllAllProvides access to QObject or QML objects from HTML clients for seamless integration of Qt applications with HTML/JavaScript clients.
Qt WebEngineAllWindows, Linux, and macOS.Classes and functions for embedding web content in applications using the Chromium browser project.
Qt WebSocketsAllAllProvides WebSocket communication compliant with RFC 6455.
Qt WebViewAllPlatforms with a native web engine.Displays web content in a QML application by using APIs native to the platform, without the need to include a full web browser stack.
Qt XMLAllAllHandling of XML in a Document Object Model (DOM) API.

Add-ons available under Commercial Licenses, or GNU General Public License v3

Qt ChartsAllAllUI Components for displaying visually pleasing charts, driven by static or dynamic data models.
Qt CoAPAllAllImplements the client side of CoAP defined by RFC 7252.
Qt Data VisualizationAllAllUI Components for creating stunning 3D data visualizations.
Qt Lottie AnimationAllAllA QML API for rendering graphics and animations in JSON format, exported by the Bodymovin plugin for Adobe® After Effects.
Qt MQTTAllAllProvides an implementation of the MQTT protocol specification.
Qt Network AuthorizationAllAllProvides support for OAuth-based authorization to online services.
Qt Quick 3DAllAllProvides a high-level API for creating 3D content or UIs based on Qt Quick.
Qt Quick 3D PhysicsAllAll supported platforms except QNX and INTEGRITY.Qt Quick 3D Physics provides a high-level QML module adding physical simulation capabilities to Qt Quick 3D.
Qt Quick TimelineAllAllEnables keyframe-based animations and parameterization.
Qt Virtual KeyboardAllLinux and Windows desktop, and Boot to Qt targets.A framework for implementing different input methods as well as a QML virtual keyboard. Supports localized keyboard layouts and custom visual themes.
Qt Wayland CompositorLinuxLinux and Boot to Qt targets.Provides a framework to develop a Wayland compositor.

Note: All* refers to all supported platforms except INTEGRITY.

The following add-ons are still in development, but are available as technology previews:

Qt Add-Ons in Technical Preview

ModuleDevelopment PlatformsTarget PlatformsDescription
Qt HTTP ServerAllAllA framework for embedding an HTTP server into a Qt application.
Qt ProtobufAllAllProvides an ability to generate Qt-based classes from protobuf specifications.
Qt GraphsAllAllProvides functionality for visualizing data in 3D as bar, scatter, and surface graphs.
Qt GRPCAllAllProvides an ability to generate Qt-based classes from protobuf specifications used to communicate with gRPC® services.
Qt LocationAllAllProvides QML and C++ interfaces to create location-aware applications.

Where to Go from Here

We invite you to explore the rest of Qt. We prepared overviews which help you decide which APIs to use and our examples demonstrate how to use our API.

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