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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. They will remain source and binary compatible during 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
Qt Core Core non-graphical classes used by other modules.
Qt GUI Base classes for graphical user interface (GUI) components. Includes OpenGL.
Qt Multimedia Classes for audio, video, radio and camera functionality.
Qt Multimedia Widgets Widget-based classes for implementing multimedia functionality.
Qt Network Classes to make network programming easier and more portable.
Qt QML Classes for QML and JavaScript languages.
Qt Quick A declarative framework for building highly dynamic applications with custom user interfaces.
Qt Quick Controls 2 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.
Qt Quick Test A unit test framework for QML applications, where the test cases are written as JavaScript functions.
Qt SQL Classes for database integration using SQL.
Qt Test Classes for unit testing Qt applications and libraries.
Qt Widgets Classes 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:

Module Development Platforms Target Platforms Description
Active Qt Windows Classes for applications which use ActiveX and COM
Qt 3D All Functionality for near-realtime simulation systems with support for 2D and 3D rendering.
Enginio (Deprecated) All All A Backend-as-a-Service solution to ease the backend development for connected and data-driven applications.
Qt Android Extras All Android Provides platform-specific APIs for Android.
Qt Bluetooth All Android, iOS, Linux and macOS Provides access to Bluetooth hardware.
Qt Canvas 3D All Enables OpenGL-like 3D drawing calls from Qt Quick applications using JavaScript.
Qt Concurrent Classes for writing multi-threaded programs without using low-level threading primitives.
Qt D-Bus All Classes for inter-process communication over the D-Bus protocol.
Qt Gamepad All Android, iOS, macOS, tvOS (including the tvOS remote), Linux, Windows Enables Qt applications to support the use of gamepad hardware.
Qt Graphical Effects All Graphical effects for use with Qt Quick 2.
Qt Help All All Classes for integrating documentation into applications, similar to Qt Assistant.
Qt Image Formats All Plugins for additional image formats: TIFF, MNG, TGA, WBMP.
Qt Location All All Displays map, navigation, and place content in a QML application.
Qt Mac Extras All macOS Provides platform-specific APIs for macOS.
Qt Network Authorization All All Provides support for OAuth-based authorization to online services.
Qt NFC All Android and Linux Provides access to Near-Field communication (NFC) hardware.
Qt OpenGL (Deprecated) OpenGL support classes. Deprecated in favor of the QOpenGL* classes in the Qt GUI module.
Qt Platform Headers Provides classes that encapsulate platform-specific information, tied to a given runtime configuration of a platform plugin.
Qt Positioning All Android, iOS, macOS, Linux, WinRT. Provides access to position, satellite and area monitoring classes.
Qt Print Support All Classes to make printing easier and more portable.
Qt Purchasing All Android, iOS, and macOS. Enables in-app purchase of products in Qt applications.
Qt Quick Controls All All Reusable Qt Quick based UI controls to create classic desktop-style user interfaces.
Qt Quick Extras All Provides a specialized set of controls that can be used to build interfaces in Qt Quick.
Qt Quick Widgets All Provides a C++ widget class for displaying a Qt Quick user interface.
Qt Script (Deprecated) All Classes for making Qt applications scriptable. Deprecated in favor of the QJS* classes in the Qt QML module.
Qt SCXML All All Provides classes and tools for creating state machines from SCXML files and embedding them in applications.
Qt Script Tools (Deprecated) All Additional components for applications that use Qt Script.
Qt Sensors All Android, Qt for iOS, WinRT and Mer. Provides access to sensor hardware and motion gesture recognition.
Qt Serial Bus All Windows, Linux and Boot to Qt targets. Provides access to serial industrial bus interface. Currently the module supports the CAN bus and Modbus protocols.
Qt Serial Port All Windows, Linux, and macOS. Provides access to hardware and virtual serial ports.
Qt Speech All Provides support for accessibility features such as text-to-speech.
Qt SVG 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 WebChannel All All Provides access to QObject or QML objects from HTML clients for seamless integration of Qt applications with HTML/JavaScript clients.
Qt WebEngine All Windows, Linux, and macOS. Classes and functions for embedding web content in applications using the Chromium browser project.
Qt WebSockets All All Provides WebSocket communication compliant with RFC 6455.
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.
Qt Windows Extras All Windows Provides platform-specific APIs for Windows.
Qt X11 Extras All Linux/X11 Provides platform-specific APIs for X11.
Qt XML 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 Support for XPath, XQuery, XSLT and XML schema validation.
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 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 Virtual Keyboard All Linux 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.

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.

Feature Description
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.

Technology Preview Modules

The following modules are still in development but are available as technology previews.

Module Description
Qt Remote Objects Provides an easy to use mechanism for sharing a QObject's API (Properties/Signals/Slots) between processes or devices.

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:

Tool Description
Qt Designer Classes for extending Qt Designer.

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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