Progression Builder
Pick an instrument and tuning, then add chord slots. Each slot becomes a column where you choose the root, quality, and a specific voicing. Voicings and suggested chords are ranked by how few fret and string movements your fingers need from the previous chord — the easier transitions sit at the top, with their cost shown in the bottom-right corner of each chord.
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Illustrated reference
Build a progression and check its key
An original I–IV–V example: In C major, these roots are scale degrees 1, 4 and 5.
Use the tools as a starting point: Short progressions can fit several keys; a score is not proof. Build: Choose instrument, tuning and chord slots. Check: Enter the resulting chords in the key guesser. Listen: Confirm which chord actually sounds like home.
Progression workflow
