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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 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.

  • Qt Core

    Core non-graphical classes used by other modules.

  • Qt D-Bus

    Classes for inter-process communication over the D-Bus protocol.

  • Qt GUI

    Base classes for graphical user interface (GUI) components.

  • 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 UIs.

  • Qt Quick Controls

    Lightweight QML types for creating performant user interfaces for desktop, embedded, and mobile devices.

  • 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 Test

    Classes for unit testing Qt applications and libraries.

  • Qt Widgets

    Classes to extend Qt GUI with C++ widgets.

Note: The binary compatibility guarantee does not apply to Qt Test and Qt Quick Test modules. However, they will remain source compatible.

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.

  • Active Qt

    Classes for applications which use ActiveX and COM (Windows only).

  • Qt Bluetooth

    Provides access to Bluetooth hardware.

  • Qt Charts

    UI Components for displaying visually pleasing charts, driven by static or dynamic data models.

  • Qt CoAP

    Implements the client side of CoAP defined by RFC 7252.

  • Qt Concurrent

    Classes for writing multi-threaded programs without using low-level threading primitives.

  • Qt Data Visualization

    UI Components for creating stunning 3D data visualizations.

  • Qt Graphs

    Provides functionality for visualizing data in 3D as bar, scatter, and surface graphs, as well as 2D in area, bar, donut, line, pie, scatter, and spline graphs.

  • Qt GRPC

    Provides an ability to generate Qt-based classes from protobuf specifications used to communicate with gRPC® services.

  • Qt Help

    Classes for integrating documentation into applications.

  • Qt HTTP Server

    A framework for embedding an HTTP server into a Qt application.

  • Qt Image Formats

    Plugins for additional image formats: TIFF, MNG, TGA, WBMP.

  • Qt Lottie Animation

    A QML API for rendering graphics and animations in JSON format, exported by the Bodymovin plugin for Adobe® After Effects.

  • Qt MQTT

    Provides an implementation of the MQTT protocol specification.

  • Qt Multimedia

    A rich set of QML types and C++ classes to handle multimedia content. Also includes APIs to handle camera access.

  • Qt Network Authorization

    Provides support for OAuth-based authorization to online services.

  • Qt NFC

    Provides access to Near-Field communication (NFC) hardware. On desktop platforms NDEF access is only supported for Type 4 tags.

  • Qt OPC UA

    Protocol for data modeling and exchange of data in industrial applications.

  • Qt OpenGL

    C++ classes that make it easy to use OpenGL in Qt applications. A separate library (Qt OpenGL Widgets) provides a widget for rendering OpenGL graphics.

  • Qt Positioning

    Provides access to position, satellite info and area monitoring classes.

  • Qt Print Support

    Classes to make printing easier and more portable.

  • Qt Protobuf

    Provides an ability to generate Qt-based classes from protobuf specifications.

  • Qt Quick 3D

    Provides a high-level API for creating 3D content or UIs based on Qt Quick.

  • Qt Quick 3D Physics

    Qt Quick 3D Physics provides a high-level QML module adding physical simulation capabilities to Qt Quick 3D.

  • Qt Quick Widgets

    Provides a C++ widget class for displaying a Qt Quick user interface.

  • Qt Quick Effects

    Provides QML types for applying one or more simple graphical effects to Qt Quick items.

  • Qt Quick Particles

    Provides QML types for particle effects.

  • Qt Quick Timeline

    Enables keyframe-based animations and parameterization.

  • Qt Remote Objects

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

  • Qt SCXML

    Provides classes and tools for creating state machines from SCXML files and embedding them in applications.

  • Qt Sensors

    Provides access to sensor hardware on Android, iOS, and Windows platforms.

  • Qt Serial Bus

    Provides access to serial industrial bus interfaces. Currently, the module supports the CAN bus and Modbus protocols.

  • Qt Serial Port

    Provides classes to interact with hardware and virtual serial ports.

  • Qt Shader Tools

    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 Spatial Audio

    Provides support for spatial audio. Create sound scenes in 3D space containing different sound sources and room related properties such as reverb.

  • Qt SQL

    Classes for database integration using SQL.

  • Qt State Machine

    Provides classes for creating and executing state graphs.

  • Qt SVG

    Classes for displaying the contents of SVG files. Supports a subset of the SVG 1.2 Tiny standard. A separate library (Qt SVG Widgets) provides support for rendering SVG files in a widget UI.

  • Qt TextToSpeech

    Provides support for synthesizing speech from text and playing it as audio output.

  • Qt UI Tools

    Classes for loading QWidget based forms created in Qt Widgets Designer dynamically, at runtime.

  • Qt Virtual Keyboard

    A framework for implementing different input methods as well as a QML virtual keyboard. Supports localized keyboard layouts and custom visual themes.

  • Qt Wayland Compositor

    Provides a framework to develop a Wayland compositor on Linux and Boot to Qt targets.

  • Qt WebChannel

    Provides access to QObject or QML objects from HTML clients for seamless integration of Qt applications with HTML/JavaScript clients.

  • Qt WebSockets

    Provides WebSocket communication compliant with RFC 6455.

  • Qt WebView

    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 XML

    Handling of XML in a Document Object Model (DOM) API.

  • Qt 5 Compatibility APIs: Graphical Effects

    Qt Graphical Effects module from Qt 5 provided for compatibility.

  • Qt 5 Core Compatibility APIs

    Qt Core APIs that were in Qt 5 but not Qt 6.

Qt Add-Ons in Technical Preview

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

  • Qt Location

    Provides QML and C++ interfaces to create location-aware applications.

Qt Extension Modules

Qt Extension Modules bring additional functionality to Qt. They may be part of a given Qt release, but can deviate from the other Qt modules in terms of release schedule, platform support, the binaries Qt provides, commercial support, or compatibility promises. You can find specific details in the module documentation for each Extension Module.

  • Qt WebEngine

    Classes and functions for embedding web content in applications using the Chromium browser project.

  • Qt PDF

    Classes and functions for rendering PDF documents on desktop platforms.

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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