Live drag editing • Web Audio playback • Static deploy friendly

Sketch progressions fast, then shape them by feel.

Generate a usable progression instantly, or drag each chord vertically to shift its function inside the key. Great for breaking writer's block without opening a DAW first.

C major
Current key center
Neutral
Mood profile
1 chord / bar
Playback rhythm
Transport
Preview with soft synth playback
Tip: drag a chord up or down. Higher bars lean brighter and more resolved. Lower bars lean darker and more tense.
Progression Builder
Vertical position changes scale degree. Playback follows left to right.
I • vi • IV • V