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 Core||Core non-graphical classes used by other modules.|
|Qt GUI||Base classes for graphical user interface (GUI) components. Includes OpenGL.|
|Qt Network||Classes to make network programming easier and more portable.|
|Qt Quick||A declarative framework for building highly dynamic applications with custom user interfaces.|
|Qt Quick Controls||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.|
|Qt Quick Dialogs||Types for creating and interacting with system dialogs from a Qt Quick application.|
|Qt Quick Layouts||Layouts are items that are used to arrange Qt Quick 2 based items in the user interface.|
Note: The binary compatibility guarantee does not apply to Qt Quick Test. However, it will remain source compatible.
|Qt SQL||Classes for database integration using SQL.|
|Qt Test||Classes 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 Widgets||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 Getting Started with Qt page.
The following table lists the Qt add-ons:
|Module||Development Platforms||Target Platforms||Description|
|Qt 3D||All||All||Functionality for near-realtime simulation systems with support for 2D and 3D rendering.|
|Qt Bluetooth||All||Android, iOS, Linux, macOS, and||Provides access to Bluetooth hardware.|
|Qt Concurrent||All||All (*)||Classes for writing multi-threaded programs without using low-level threading primitives.|
|Qt D-Bus||All||All (*)||Classes for inter-process communication over the D-Bus protocol.|
|Qt Help||All||All (*)||Classes for integrating documentation into applications, similar to Qt Assistant.|
|Qt Image Formats||All||All||Plugins for additional image formats: TIFF, MNG, TGA, WBMP.|
|Qt NFC||All||Android and Linux (*)||Provides access to Near-Field communication (NFC) hardware.|
|Qt Platform Headers||Qt for Windows, Linux, macOS||Qt for Windows, Linux, macOS, Android (*)||Provides classes that encapsulate platform-specific information, tied to a given runtime configuration of a platform plugin.|
|Qt Print Support||All||All (*)||Classes to make printing easier and more portable.|
|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 Quick Widgets||All||All (*)||Provides a C++ widget class for displaying a Qt Quick user interface.|
|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.|
|Qt SVG||All||All||Classes for displaying the contents of SVG files. Supports a subset of the SVG 1.2 Tiny standard.|
|Qt UI Tools||All||All (*)||Classes for loading QWidget based forms created in Qt Designer dynamically, at runtime.|
|Qt XML||All||All (*)||C++ implementations of SAX and DOM.|
|Qt Wayland Compositor||Linux||Linux and Boot to Qt targets.||Provides a framework to develop a Wayland compositor.|
Add-ons available under Commercial Licenses, or GNU General Public License v3
|Qt Charts||All||All||UI Components for displaying visually pleasing charts, driven by static or dynamic data models.|
|Qt Data Visualization||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 Network Authorization||All||All||Provides support for OAuth-based authorization to online services.|
|Qt for WebAssembly||All||Web browsers with WebAssembly support||A platform target to compile Qt applications for the web browsers using WebAssembly.|
|Qt Quick WebGL||All||WebGL-enabled web browsers||Provides a platform plugin 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.
|Qt Automotive Suite||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.|
|Qt for Automation||Libraries and tools for automation related domains, such as KNX, OPC UA, and MQTT.|
|Qt for Device Creation||Tools for fast, easy, and fully-integrated embedded device application development. Included in most other value-add solutions.|
|Qt for MCUs||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.|
Qt Tools run on all the supported development platforms and facilitate the development and design of applications.
The following table lists the Qt tools:
|Qt Designer||Classes for extending Qt Designer.|
|Qt Distance Field Generator||Generates distance field information for text entities in an application UI.|
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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