Key · mood · lock & re-roll

Chord Progression Generator

Stuck for chords? Pick a key and a mood and the generator writes a progression that actually works — built from how chords naturally pull towards each other. Lock the chords you like and re-roll the rest, hear it, then send it to the Looper to write a song over it.

Tip: press Space to generate again. Tap a chord to hear it; tap 🔓 to keep it when you re-roll.

How the generator works

Chords in a key have jobs: the tonic (I or i) feels like home, pre-dominant chords (IV, ii) move away, and the dominant (V) creates tension that wants to resolve home. The generator walks between these with weighted choices — the same moves you hear in real songs — and only keeps progressions that loop back smoothly. Each mood changes which chords it may use and how they are coloured (sevenths, add9s, borrowed ♭VII and ♭VI chords).

Turning a progression into a song

1. Loop it in the Looper and pick a strum or picking pattern (or learn one from the strumming patterns).
2. Hum melodies over it; use notes from the key's scale (try Analyse).
3. Make a chorus by re-rolling with one or two chords locked, so the sections feel related.

Questions