Almost perfect :)

Its an awesome app! My only complaint is some chords are spelled wrong. I.e. The music at the top will say C-E-G#, but the piano spells it C-E-Ab, which is technically wrong according to simple music theory. It can become confusing for those that are just learning chords and such. Even though the notes are enharmonic, it is not correctly spelled. Fix this and maybe add some other chords such as jazz chords and youre golden.

Spazer10 about Cheeky Fingers - Piano Chord Dictionary, Progressions and Suggestions, v1.2.5