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 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:

Qt CoreCore non-graphical classes used by other modules.
Qt GUIBase classes for graphical user interface (GUI) components. Includes OpenGL.
Qt MultimediaClasses for audio, video, radio and camera functionality.
Qt Multimedia WidgetsWidget-based classes for implementing multimedia functionality.
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 SQLClasses for database integration using SQL.
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.

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

QT -= gui

On Windows, if you do not use qmake or other build tools such as CMake, you also need to link against the qtmain library.

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 Android ExtrasAllAndroidProvides platform-specific APIs for Android.
Qt BluetoothAllAndroid, iOS, Linux, macOS, and UWP (*)Provides access to Bluetooth hardware.
Qt ConcurrentAllAll (*)Classes for writing multi-threaded programs without using low-level threading primitives.
Qt D-BusAllAll (*)Classes for inter-process communication over the D-Bus protocol.
Qt GamepadAllAndroid, iOS, macOS, tvOS (including the tvOS remote), Linux, Windows, and QNXEnables Qt applications to support the use of gamepad hardware.
Qt Graphical EffectsAllAllGraphical effects for use with Qt Quick 2.
Qt HelpAllAll (*)Classes for integrating documentation into applications, similar to Qt Assistant.
Qt Image FormatsAllAllPlugins for additional image formats: TIFF, MNG, TGA, WBMP.
Qt LocationAllAllDisplays map, navigation, and place content in a QML application.
Qt Mac ExtrasAllmacOSProvides platform-specific APIs for macOS.
Qt NFCAllAndroid and Linux (*)Provides access to Near-Field communication (NFC) hardware.
Qt OpenGL (Deprecated)AllAll (*)OpenGL support classes. Deprecated in favor of the QOpenGL* classes in the Qt GUI module.
Qt PDFAllWindows, Linux, and macOS.Classes and functions for rendering PDF documents.
Qt Platform HeadersQt for Windows, Linux, macOSQt for Windows, Linux, macOS, Android (*)Provides classes that encapsulate platform-specific information, tied to a given runtime configuration of a platform plugin.
Qt PositioningAllAndroid, iOS, macOS, Linux, UWP (*).Provides access to position, satellite and area monitoring classes.
Qt Print SupportAllAll (*)Classes to make printing easier and more portable.
Qt PurchasingAllAndroid, iOS, and macOS.Enables in-app purchase of products in Qt applications.
Qt Quick Controls 1 (Deprecated)AllAll (*)Reusable Qt Quick based UI controls to create classic desktop-style user interfaces. Deprecated in favor of Qt Quick Controls 2, which are better and easier to use.
Qt Quick ExtrasAllAll (*)Provides a specialized set of controls that can be used to build interfaces in Qt Quick.
Qt Quick TimelineAllAll (*)Enables keyframe-based animations and parameterization.
Qt Quick WidgetsAllAll (*)Provides a C++ widget class for displaying a Qt Quick user interface.
Qt Remote ObjectsAllAllProvides an easy to use mechanism for sharing a QObject's API (Properties/Signals/Slots) between processes or devices.
Qt Script (Deprecated)AllAllClasses for making Qt applications scriptable. Deprecated in favor of the QJS* classes in the Qt QML module.
Qt SCXMLAllAllProvides classes and tools for creating state machines from SCXML files and embedding them in applications.
Qt Script Tools (Deprecated)AllAll (*)Additional components for applications that use Qt Script.
Qt SensorsAllAndroid, Qt for iOS, UWP, Mer, and QNX.Provides access to sensor hardware and motion gesture recognition.
Qt Serial BusAllWindows, Linux, Boot to Qt targets, and QNX.Provides access to serial industrial bus interface. Currently the module supports the CAN bus and Modbus protocols.
Qt Serial PortAllWindows, Linux, macOS, and QNX.Provides access to hardware and virtual serial ports.
Qt SpeechAllAll except QNX.Provides support for accessibility features such as text-to-speech.
Qt SVGAllAllClasses for displaying the contents of SVG files. Supports a subset of the SVG 1.2 Tiny standard.
Qt UI ToolsAllAll (*)Classes 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 Windows ExtrasAllWindowsProvides platform-specific APIs for Windows.
Qt X11 ExtrasAllLinux/X11Provides platform-specific APIs for X11.
Qt XMLAllAll (*)C++ implementations of SAX and DOM.

Note: This module is not required to use QXmlStreamReader and QXmlStreamWriter. They are already part of Qt Core.

Qt XML Patterns (deprecated)AllAllSupport for XPath, XQuery, XSLT and XML schema validation.

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 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 Network AuthorizationAllAllProvides support for OAuth-based authorization to online services.
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.
Qt for WebAssemblyAllWeb browsers with WebAssembly supportA platform target to compile Qt applications for the web browsers using WebAssembly.
Qt Quick 3DAllAllProvides a high-level API for creating 3D content or UIs based on Qt Quick.
Qt Quick WebGLAllWebGL-enabled web browsersProvides a platform plugin that allows streaming Qt Quick user interfaces over the network using WebGL™.

(*) The QNX status is not known.

Value-Add Modules

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 SuiteA 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 AutomationLibraries and tools for automation related domains, such as KNX, OPC UA, and MQTT.
Qt for Device CreationTools for fast, easy, and fully-integrated embedded device application development. Included in most other value-add solutions.
Qt for MCUsOffers 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

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 DesignerClasses for extending Qt Designer.
Qt Distance Field GeneratorGenerates distance field information for text entities in an application UI.

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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