I develop an web online chords & scales reference. All free and open with a browser on a workstation or a mobile.
Includes an evolving chords and scales database.
Piano keyboard and different fretboards may be used (6 to 8 strings guitars, 4 to 6 strings basses, ukulele ...) are supplied to display these chords and scales online.
Includes different other functionalities like "name that chord / scale", "random guitar backing track player", "chord progression composer", "metronome" ...
Comments, feedbacks, ideas of new functionalities are welcome.