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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 5.

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://	Base classes for graphical user interface (GUI) components. Includes OpenGL.
https://	Classes for audio, video, radio and camera functionality.
https://	Widget-based classes for implementing multimedia functionality.
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 database integration using SQL.
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.

If you use https:// to build your projects, the https:// and https:// modules are included by default. To link only against Qt Core, add the following line to your .pro file:

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QT -= gui

On Windows, if you do not use https:// or other build tools such as http://, you also need to link against the qtmain library.

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	https://	Provides platform-specific APIs for Android.
https://	All	https://, https://, https://, https://, and https:// (*)	Provides access to Bluetooth hardware.
https://	All	All (*)	Classes for writing multi-threaded programs without using low-level threading primitives.
https://	All	All (*)	Classes for inter-process communication over the D-Bus protocol.
https://	All	https://, https://, https://, tvOS (including the tvOS remote), https://, https://, and https://	Enables Qt applications to support the use of gamepad hardware.
https://	All	All	Graphical effects for use with Qt Quick 2.
https://	All	All (*)	Classes for integrating documentation into applications, similar to Qt Assistant.
https://	All	All	Plugins for additional image formats: TIFF, MNG, TGA, WBMP.
https://	All	All	Displays map, navigation, and place content in a QML application.
https://	All	https://	Provides platform-specific APIs for macOS.
https://	All	https:// and https:// (*)	Provides access to Near-Field communication (NFC) hardware.
https:// (Deprecated)	All	All (*)	OpenGL support classes. Deprecated in favor of the QOpenGL* classes in the https:// module.
https://	https://, https://, https://	https://, https://, https://, https:// (*)	Provides classes that encapsulate platform-specific information, tied to a given runtime configuration of a https://.
https://	All	https://, https://, https://, https://, https:// (*).	Provides access to position, satellite and area monitoring classes.
https://	All	All (*)	Classes to make printing easier and more portable.
https://	All	https://, https://, and https://.	Enables in-app purchase of products in Qt applications.
https:// (Deprecated)	All	All (*)	Reusable Qt Quick based UI controls to create classic desktop-style user interfaces. Deprecated in favor of https:// 2, which are better and easier to use.
https://	All	All (*)	Provides a specialized set of controls that can be used to build interfaces in Qt Quick.
https://	All	All (*)	Enables keyframe-based animations and parameterization.
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 https://'s API (Properties/Signals/Slots) between processes or devices.
https:// (Deprecated)	All	All	Classes for making Qt applications scriptable. Deprecated in favor of the QJS* classes in the https:// module.
https://	All	All	Provides classes and tools for creating state machines from SCXML files and embedding them in applications.
https:// (Deprecated)	All	All (*)	Additional components for applications that use https://.
https://	All	https://, https://, https://, Mer, and https://.	Provides access to sensor hardware and motion gesture recognition.
https://	All	https://, https://, http:// targets, and https://.	Provides access to serial industrial bus interface. Currently the module supports the CAN bus and Modbus protocols.
https://	All	https://, https://, https://, and https://.	Provides access to hardware and virtual serial ports.
https://	All	All except https://.	Provides support for accessibility features such as text-to-speech.
https://	All	All	Classes for displaying the contents of SVG files. Supports a subset of the http:// standard.
https://	All	All (*)	Classes for loading https:// based forms created in Qt Designer dynamically, at runtime.
https://	All	All	Provides access to https:// or QML objects from HTML clients for seamless integration of Qt applications with HTML/JavaScript clients.
https://	All	https://, https://, and https://.	Classes and functions for embedding web content in applications using the http://.
https://	All	All	Provides WebSocket communication compliant with http://.
https://	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	https://	Provides platform-specific APIs for Windows.
https://	All	https://	Provides platform-specific APIs for X11.
https://	All	All (*)	C++ implementations of SAX and DOM. This module is not required to use https:// and https://. They are already part of https://.
https:// (deprecated)	All	All	Support for XPath, XQuery, XSLT and XML schema validation.
https://	https://	https:// and http:// targets.	Provides a framework to develop a Wayland compositor.

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.
https://	All	All	A QML API for rendering graphics and animations in JSON format, exported by the https:// plugin for Adobe® After Effects.
https://	All	All	Provides support for OAuth-based authorization to online services.
https://	All	https:// and https:// desktop, and http:// targets.	A framework for implementing different input methods as well as a QML virtual keyboard. Supports localized keyboard layouts and custom visual themes.
https://	All	Web browsers with WebAssembly support	A platform target to compile Qt applications for the web browsers using WebAssembly.
Qt Quick 3D	All	All	Provides a high-level API for creating 3D content or UIs based on Qt Quick.
https://	All	WebGL-enabled web browsers	Provides a https:// that allows streaming Qt Quick user interfaces over the network using WebGL™.

(*) The QNX status is not known.

In addition to the modules released as part of Qt 5, the following modules and tooling build on top of the Qt libraries to provide additional value. They have their own release schedule, and are available under the commercial license.

Feature	Description
https://	A collection of software components and tools to enable development of In-Vehicle-Infotainment (IVI) systems. Built on top of the Qt for Device Creation offering and compliant with the GENIVI automotive platform architecture.
http://	Libraries and tools for automation related domains, such as KNX, OPC UA, and MQTT.
http://	Tools for fast, easy, and fully-integrated embedded device application development. Included in most other value-add solutions.
https://	Offers a complete graphics framework and toolkit with everything needed to design, develop, and deploy GUIs on microcontroller units (MCUs). Applications can run either on bare metal or on a real-time operating system.

The following features are still in development but are available as technology previews. They are licensed under Commercial Licenses, or GNU General Public License v3.

Feature	Description
https:// (Technology Preview)	Provides C++ and QML APIs for rendering PDF documents.

Qt Tools run on all the supported development platforms and facilitate the development and design of applications.

The following table lists the Qt tools:

Tool	Description
https://	Classes for extending Qt Designer.

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

All Modules

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