Core Internals

All other modules rely on the core module. It also provides a host of other features, such as a “signals and slots” mechanism for seamless object communication, a meta-object and a property system and more.

Data Storage

The SQL module uses driver plugins to communicate with several database APIs. Qt also provides APIs to read, parse and write to XML streams. You can use JSON to represent simple data structures and associative arrays.

Qt Multimedia

Qt Multimedia is an essential module that provides a rich set of QML types and C++ classes to handle multimedia content. It also provides necessary APIs to access the camera and radio functionality. The included Qt Audio Engine provides types for 3D positional audio playback and content management.

Network and Connectivity

Qt lets you connect and communicate with basically anything and supports a wide range of protocols and networking options, including TCP/IP HTTP, UDP, Serial (RS232), Bluetooth, BLE, NFC and more.

Location and Positioning

The Qt Location API helps you create viable mapping solutions using the data available from some of the popular location services. The Qt Positioning API gives developers the ability to determine a position by using a variety of possible sources, including satellite, wifi, text file, or more.

Input methods

Qt provides several modules that let you interact with your device via gestures, (multi-)touch and speech. The latter is especially useful for end-users who are visually challenged.

Graphics

Graphics in Qt 5 is primarily done either through the imperative QPainter API, or through Qt’s declarative UI language, Qt Quick, and its scene graph back-end.

Qt uses OpenGL for hardware accelerated and 3D graphics, implemented on all desktop platforms and almost every mobile and embedded platform.

Integrating web content

Qt provides the Chromium-based Qt WebEngine module for applications targeting desktop and embedded platforms. For example, a web browser application for Linux platform. It is also possible to combine Qt C++ and QML code with HTML and JavaScript to create web applications.

Language bindings

When C++ isn’t the right tool for the job, different modules let you use alternative languages such as QML, Javascript or Python inside Qt.

Building and compiling

Qt supports a lot of different compilers and tools. Not only do they work across different platforms, they also help you to deploy your application on different desktop and embedded devices.

Testing and maintenance

Integrated debugging, profiling and unit-testing for all desktop mobile and embedded platforms help you identify causes for performance issues, such as slowness and unresponsive interfaces.

Design and UI Tools

se QML to craft modern, touch-based user experiences in 2D/3D, recreate the classic desktop feel with Qt Widgets or use HTML5 for dynamic web documents.

Localization and Internationalization

Design adaptable software application for various languages and regions without engineering changes. Adapt internationalized software for a specific region or language by adding locale-specific components and translating text.

Documentation Tools

Qt Help provides access to help contents programmatically and lets you integrate online help into Qt applications. Qt Assistant supports interactive help and enables you to display customer documentation to users of your Qt applications.

Configuration Tools

The Qt Light Configuration Tool is lets you browse and select features to include in the Qt build configuration and will also take care of dependencies between features.