Tour Preview

Find the Best Demos and Examples

Check out this quick tour to find the best demos and examples for you, and to see how the Felgo SDK can help you to develop your next app or game!

Qt Licensing

Qt is available under different licensing options designed to accommodate the needs of our various users:

  • Qt licensed under commercial licenses is appropriate for development of proprietary/commercial software where you do not want to share any source code with third parties or otherwise cannot comply with the terms of the GNU LGPL version 3.
  • Qt licensed under the GNU Lesser General Public License (LGPL) version 3 is appropriate for the development of Qt applications provided you can comply with the terms and conditions of the GNU LGPL version 3 (or GNU GPL version 3).

Qt contains also third-party code that is licensed under specific open-source licenses from the original authors.

Note: For open-source licensed Qt, some specific parts (modules) are not available under the GNU LGPL version 3, but under the GNU General Public License (GPL) instead. See the list of Qt modules for details. For commercial licensees, all modules are available under a single, commercial Qt license.

Qt documentation is licensed under the terms of the GNU Free Documentation License (FDL) version 1.3, as published by the Free Software Foundation. Alternatively, you may use the documentation in accordance with the terms contained in a written agreement between you and The Qt Company.

See for an overview of Qt licensing.

Purchasing and Sales Information

To purchase a Qt license, visit

For further information and assistance about Qt licensing, contact our sales; see for contact details.

Licensed Code in Qt

The following page documents the open-source licenses used in different parts of Qt:

Qt_Technology_Partner_RGB_475 Qt_Service_Partner_RGB_475_padded