HarmonyMap

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Diatonic shows the 7 chords of your scale around a wheel. Constellation arranges all 24 major + minor triads on the circle of fifths. Branches draws all 12 keys at once — each key with its 6 main chords as a branch — and shows pivot chords that bridge between keys (the Illustrated-Harmony multi-key network).

Add layers

7th chords Stack a 7th on every triad — Cmaj7 instead of C, Dm7 instead of Dm. Secondary dominants · V/x Show the V-of-each-chord — D7→G, A7→Dm, E7→Am etc. The borrowed dominants that aren't in your scale. Borrowed chords · modal interchange Chords from the parallel mode — in C major, borrow ♭III, ♭VI, ♭VII from C minor. Scale strip Chromatic note grid — highlights which 12 notes are in your scale at a glance. Show chord notes Render the actual notes of every chord under its name — `C → C E G`, `Dm → D F A`. Read instead of memorise.

When you tap a chord

Scale-fifths chain Highlights the diatonic 5ths cycle leading to the chord you picked: vi → ii → V → I. Dominant chain · Cadena de Dominantes Chain of secondary dominants resolving to your target — B7 → E7 → A7 → D7 → G7 → C.