This is really cool!
A small suggestion for improvement: the labels of the black keys currently don't match their function according to the key signature. For example, in F major the black key between A and B should be called Bb, not A#.
It displays sheet music as you play, and let's you take snapshots of specific chords, then keeps a running list of chords as keyboard visuals (instead of just displaying sheet music).
Just a simple tool for songwriting/ figuring out songs by ear, or just understanding music key theory (which I'm admittedly a still a beginner at).
A small suggestion for improvement: the labels of the black keys currently don't match their function according to the key signature. For example, in F major the black key between A and B should be called Bb, not A#.