All Modules

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:

Module	Description
https://	Core non-graphical classes used by other modules.
https://	Classes for inter-process communication over the D-Bus protocol.
https://	Base classes for graphical user interface (GUI) components.
https://	Classes to make network programming easier and more portable.
https://	Classes for QML and JavaScript languages.
https://	A declarative framework for building highly dynamic applications with custom user interfaces.
https://	Provides 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.
https://	Types for creating and interacting with system dialogs from a Qt Quick application.
https://	Layouts are items that are used to arrange Qt Quick 2 based items in the user interface.
https://	A unit test framework for QML applications, where the test cases are written as JavaScript functions. The binary compatibility guarantee does not apply to Qt Quick Test. However, it will remain source compatible.
https://	Classes for unit testing Qt applications and libraries. The binary compatibility guarantee does not apply to Qt Test. However, it will remain source compatible.
https://	Classes to extend Qt GUI with C++ widgets.

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 https:// page.

The following table lists the Qt add-ons:

Module	Development Platforms	Target Platforms	Description
https://	https://	https://	Classes for applications which use ActiveX and COM
https://	All	All	Functionality for near-realtime simulation systems with support for 2D and 3D rendering.
https://	All	All	Qt Core APIs that were in Qt 5 but not Qt 6.
https://	All	https://, https://, https://, https://, https:// and https://	Provides access to Bluetooth hardware.
https://	All	All	Implements the client side of CoAP defined by RFC 7252.
https://	All	All	Classes for writing multi-threaded programs without using low-level threading primitives.
Qt Help	All	All	Classes for integrating documentation into applications.
https://	All	All	Plugins for additional image formats: TIFF, MNG, TGA, WBMP.
Qt Multimedia	All	All*	A rich set of QML types and C++ classes to handle multimedia content. Also includes APIs to handle camera access.
https://	All	https:// and https://	Provides access to Near-Field communication (NFC) hardware.
Qt OPC UA	All	All (except QNX, WebAssembly)	Protocol for data modeling and exchange of data in industrial applications.
https://	All	All	C++ classes that make it easy to use OpenGL in Qt applications. A separate library of https:// provides a widget for rendering OpenGL graphics.
https://	All	Android, https://, https://, https:// and https://	Provides access to position, satellite info and area monitoring classes.
https://	All	All	Classes to make printing easier and more portable.
https://	All	All	Provides a C++ widget class for displaying a Qt Quick user interface.
https://	All	All	Provides an easy to use mechanism for sharing a QObject's API (Properties/Signals/Slots) between processes or devices.
Qt SCXML	All	All	Provides classes and tools for creating state machines from SCXML files and embedding them in applications.
https://	All	Android, https://, and https://	Provides access to sensor hardware.
https://	All	Linux, https://, https:// and https://	Provides access to serial industrial bus interfaces. Currently, the module supports the CAN bus and Modbus protocols.
https://	All	Linux, https://, https:// and https://	Provides classes to interact with hardware and virtual serial ports.
https://	All	All	Classes for database integration using SQL.
Qt State Machine	All	All	Provides classes for creating and executing state graphs.
Qt SVG	All	All	Classes for displaying the contents of SVG files. Supports a subset of the http:// standard. A separate library of Qt SVG Widgets C++ Classes provides support for rendering SVG files in a widget UI.
https://	All	All	Classes for loading QWidget based forms created in Qt Designer dynamically, at runtime.
https://	All	All	Provides access to QObject or QML objects from HTML clients for seamless integration of Qt applications with HTML/JavaScript clients.
https://	All	Windows, https://, and https://.	Classes and functions for embedding web content in applications using the http://.
Qt WebSockets	All	All	Provides WebSocket communication compliant with https://.
Qt WebView	All	Platforms 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.
https://	All	All	Handling of XML in a Document Object Model (DOM) API.

Add-ons available under Commercial Licenses, or GNU General Public License v3
https://	All	All	UI Components for displaying visually pleasing charts, driven by static or dynamic data models.
https://	All	All	UI Components for creating stunning 3D data visualizations.
Qt Lottie Animation	All	All	A QML API for rendering graphics and animations in JSON format, exported by the Bodymovin plugin for Adobe® After Effects.
Qt MQTT	All	All	Provides an implementation of the MQTT protocol specification.
Qt Network Authorization	All	All	Provides support for OAuth-based authorization to online services.
Qt Quick 3D	All	All	Provides a high-level API for creating 3D content or UIs based on Qt Quick.
Qt Quick Timeline	All	All	Enables keyframe-based animations and parameterization.
Qt Shader Tools	All	All	Provides 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.
https://	All	Linux and https:// desktop, and https:// targets.	A framework for implementing different input methods as well as a QML virtual keyboard. Supports localized keyboard layouts and custom visual themes.
https://	Linux	https:// and https:// targets.	Provides a framework to develop a Wayland compositor.

All* refers to all supported platforms except QNX and INTEGRITY.

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

Module	Development Platforms	Target Platforms	Description
https://	All	Windows, https://, and https://.	Classes and functions for rendering PDF documents.

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.

https:// - list of topics about application development
https:// - code samples and tutorials
https:// - a listing of C++ and QML APIs
https:// - status of Qt 5 modules in Qt 6.0

All Modules

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