Undercover Zest — Guitar Chord Progression Builder

Build chord progressions in any key, visualise scales on the fretboard, use the built-in tuner and arpeggiator. Undercover Zest is a free, interactive guitar songwriting tool — no sign-up, no downloads, just start building.

Part of the Undercover Zest songwriting suite — including RhymeForge, CollisionLab, Morning Pages, and SenseSpark.

SET THE KEY

YOUR PROGRESSION:

Click chords to build a progression...

Select a chord

Click a chord to see theory tips, voicings, and voice leading advice.