For iPad & iPhone

Touch a chord.
Hear where it goes.

Theory clicks when you can see the colors, hear the voicings, and feel the resolutions under your own fingers.

Beta testing now. iPad & iPhone.

How it works

21 modes. One chart.
From ii–V–I to Giant Steps.

Major, harmonic minor, melodic minor. Each mode has its own color so borrowed chords and tritone subs stand out the moment you add them.
Colorblind and high-contrast modes included.

Every preset tells you why it sounds the way it does.

Jazz Essentials ii-V-I Mastery Blues Forms Turnarounds Modal Jazz Standard Forms Bossa Nova Rhythm Changes Coltrane Changes Classical Pop & Rock J-Pop

Girl from Ipanema lesson with staff notation and theory notes

Ionian Dorian Phrygian Lydian Mixolydian Aeolian Locrian Harm. Minor Mel. Minor

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Instant Transpose

One tap, any key. Practice that ii–V–I in all twelve without rebuilding anything.

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Automatic Voicing

Voice leading that actually sounds right. Drop voicing when things get thick.

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Staff Notation

Real score, real time. Ties, rests, notes lighting up as they sound.

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Theory Reference

Chord-scale pairings, the stuff from Levine and Russell. Right there when you need it.

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Song View

Lead-sheet layout colored by mode. Spot borrowed chords and modal interchange instantly.

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Shape Every Voicing

Extensions, inversions, quality overrides, beat durations. Your call.

Practice

Pick up your instrument.
Hit loop. Solo.

Loop any progression and play over it. The backing track stays out of your way. Just chords, clean and steady.

Transpose on the fly. Same lick, new key, no setup.
Colors tell you the scale. Glance at the chart, know what fits.
Pairs with your studies. Levine, Aebersold, Berklee. This makes the book concrete.

Keys

Bass

Guitar

Brass

Woodwinds

Voice

Touch a chord.Hear where it goes.

21 modes. One chart.From ii–V–I to Giant Steps.