About Qt

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What is Qt?

Qt on Wikipedia

  • framework
  • cross-platform
  • application development
  • C++, extensions with MOC
  • GUIs in QML (QtQuick) or XML (QWidgets)
  • Desktop, embedded, mobile: Linux, OS X, Windows, VxWorks, QNX, Android, iOS, BlackBerry, Sailfish OS,..., see Supported Platforms
  • Bindings to other programming languages, e.g. to Python using PyQt
  • Qt is owned by The Qt Company (wholly owned subsidiary of Digia Plc., Finland)
  • The Qt Governance Model
  • Developed by many parties (see stats)
  • Different licenses: Multiple commercial licenses, LGPL, GPL, see: Licensing FAQ
  • superb documentation
  • Brings own IDE (Qt Creator) for Linux, OS X and Windows; code completion, syntax highlighting, integrated help system, debugger and profiler integration, integration for all major version control systems, GUI designer
  • Brings add-in for Microsoft Visual Studio
  • Other IDEs can be used
  • Brings additional tools like build system (qmake, other build systems like cmake also supported) and internationalization tools


  • 1 million downloads of Qt 5.3 measured just over a month after launch.[1]
  • 250+ commits by 60+ contributors per week[2]
  • Leading companies in over 70 industries use Qt to power millions of devices and applications.[3]
  • Community partners[4]:
    • FRUCT (Finnish-Russian University Cooperation in Telecommunications)
    • KDE e.V. (non-profit organization of KDE community members)


Qt 20years infographic big.jpg
Qt-history-logos 1995-2015.gif
  • “In the summer of 1990, Haavard [Nord] and Eirik [Chambe-Eng] were working together on a C++ database application for ultrasound images. The system needed to be able to run with a GUI on Unix, Macintosh, and Windows. One day that summer, Haavard and Eirik went outside to enjoy the sunshine, and as they sat on a park bench, Haavard said, “We need an object-oriented display system.” The resulting discussion laid the intellectual foundation for the object-oriented cross-platform GUI framework they would soon go on to build.”[5]
  • Release history