Circle of Fifths
Explore keys, scales, diatonic chords, and key relationships through an interactive circle of fifths.
Chord Progression Builder
Build progressions from diatonic chords in any key and play them back instantly with the built-in audio engine.
Chord Builder
Build any chord — triads, sevenths, and extended chords — and see the notes, intervals, and inversions on a piano keyboard.
Progression Sheet Generator
Choose a genre and key, then generate a 16-bar lead sheet with chord symbols and slash notation for quick comping.