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Theory you can hear.

Every theory tool plays its sound, so the ideas stay musical.

  • Circle of fifths: signatures, neighbors, relative keys and main chords
  • Progression builder with common templates and looped playback
  • Transpose, Capo helper and Scale explorer
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The circle of fifths with a key selected and its signature and main chords
In the app

The tools behind it.

  • Scale explorer

    Notes, degrees and chords

    Any key on a keyboard or neck, with degrees, chords and playback.

    Theory

  • Circle of fifths

    Keys, signatures, neighbors

    Tap a key to see its signature, neighbors, relative key and main chords, and hear them.

    Theory

  • Improvisation coach

    What to solo with, and a loop

    Which scale to solo with and why, its notes on your instrument, target notes and a backing loop.

    Theory
    Improvisation coach →

  • Progression builder

    Build, loop and save chords

    Build a progression from the key's chords or a template, loop it at any tempo and save it.

    Theory

  • Transpose

    Move a key and its chords

    Move a key and its chords to any other key.

    Theory

  • Capo helper

    Any key with open shapes

    Find the capo position to play any key with open chord shapes.

    Theory
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