Exactly what I always wanted. I can play naturally but don't know sheet music. Sometimes capturing what I play in notation helps to communicate it to other musicians I am hanging our with...
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).