Tonality is free, open-source software. The source code is available on GitHub and licensed under the GPLv3.

If you have any feedback or suggestions as to how to improve Tonality, I'd be glad to hear them! You can email me at: sascha@meta-x.de.

This software uses:

• components from the Semitone project (especially the PianoView and the PianoEngine) under the GPLv3 or later
• libraries from the FFmpeg project, under the GPLv2 or later
• Material Design icons and the Oboe library, both licensed by Google under the Apache 2.0
• audio provided by the University of Iowa Musical Instrument Samples project