- Qt 6.12
- Qt Reference Pages
- All Modules
- Qt 6.12.0 Reference Documentation

All Functions and Macros ◦ Getting Started

# 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 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 Qml Core | Provides core system functionality in QML, exposing platform‑independent application permissions and essential system‑related types.
Qt Qml WorkerScript | Enables the use of threads in a Qt Quick application.
Qt Qml Models | Contains types for defining data models in QML.
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 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 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 Qml Compiler | Contains shared functionality needed by QML tooling like the Qt Quick Compiler and qmllint.
Qt Qml Design Support | Provides design-time support for QML development.
Qt Qml Network | Exposes the Qt C++ Network functionality to QML.
Qt Qml XmlListModel | Allows you to create a read-only model from XML data in QML.
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 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 Quick Widgets | Provides a C++ widget class for displaying a Qt Quick user interface.
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 Technology Preview

The following add-ons are still in development, but are available as technology previews. A technology preview module makes no promise of source or binary compatibility between versions.

Qt Canvas Painter | Provides an API for accelerated, imperative 2D painting.
Qt Labs Platform | Provides QML types for native platform extensions.
Qt Labs StyleKit | A dedicated styling API that streamlines styling Qt Quick Controls through a set of shared design attributes.
Qt Location | Provides QML and C++ interfaces to create location-aware applications.
Qt OpenAPI | Provides an extension of the upstream OpenAPI generator that generates Qt HTTP clients, typically used for RESTful APIs.
Qt TaskTree | Provides a declarative way to compose and execute asynchronous task workflows.

## Deprecated Qt Add-Ons

The following Qt add-ons are now obsolete. They are provided to keep old source code working, but they are no longer maintained, and can be removed in a future major Qt release. We advise against using these modules in new code.

Each obsolete module comes with documentation that helps with porting existing code to actively maintained alternatives.

Obsolete module | Alternative module | Migration guide
--- | --- | ---
Qt 3D | Qt Quick 3D | Porting Qt 3D to Qt Quick 3D: A Migration Guide
Qt Charts | Qt Graphs | Qt Graphs Migration from Qt Charts
Qt Data Visualization | Qt Graphs | Qt Graphs Migration from Qt DataVisualization

## 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 PDF | Classes and functions for rendering PDF documents on desktop platforms.
Qt WebEngine | Classes and functions for embedding web content in applications using the Chromium browser project.

## 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.

- All Overviews - list of topics about application development
- Examples and Tutorials - code samples and tutorials
- Qt Reference Pages - a listing of C++ and QML APIs
- Changes to Supported Modules - status of Qt 5 modules in Qt 6.0

All Functions and Macros ◦ Getting Started