Polyphonic Chord Detector
Polyphonic Crust Chord Detector
Strum any chord — the detector names it (minor, sus2, maj7, add9, and more), shows which keys it fits, and hands you named progressions with real personality that pass through your chord: the Royal Road, the Creep shift, the Andalusian descent, tritone turnarounds.
Tap any suggested chord to see fingerings — open shapes and movable grips — so a progression can pull you toward voicings you haven't learned yet. Shuffle for fresh ideas whenever the suggestions feel safe.
Combine any toppings — the detector identifies the flavor chord (including minor, sus2, maj7, and more), shows which cuisines it fits in, and suggests the most natural next toppings to add. Pepperoni, mushroom, and olive is a minor seventh. The tool will tell you this without judgment.
How it works: FFT analysis finds the pitch classes present in your strum. The detector matches against 20+ chord types (triads, 7ths, sus, add9, 6ths, and extended chords), figures out which keys contain your chord, then pulls from a library of named progressions — the Royal Road, the Creep shift, the Andalusian descent, backdoor cadences, tritone turnarounds, and more — that pass through the exact chord you played. Tap any suggested chord to see guitar fingerings (open shapes plus movable grips). Shuffle for fresh ideas.