Guitar · Bass · Piano keys

Scales, modes and chords you can see and play.

Tap notes on the neck and CDEFGAB names the mode you just built and the chords hiding inside it. The same scale re-maps instantly to guitar, bass or piano keys — the theory stays, only the layout changes.

See what it does Read the guide

What it does

One neck, one keyboard, one theory.

Everything works offline, with no account and no tracking.

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Build any scale or mode

Tap notes straight onto the fretboard. Set the tonic, read intervals at a glance, and transpose the pattern to any key without losing its shape.

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Guitar, bass and keys

Switch instruments and the same scale re-maps instantly. Relationships stay identical — only the layout under your fingers changes.

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Find the mode

Not sure what you just played? Matching Scales lists every scale and mode containing your notes, with suggested tonics and closest matches.

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Chords in context

In chord mode each note shows which chords it belongs to. Pick a chip to see the shape, drag it along the neck for other voicings, and hear it.

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Microtonal tuner

Chromatic and microtonal modes. Tune to any target note, hear its reference tone, and save custom string tunings for alternate setups.

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Rhythm that bites

A sequencer and metronome with accents, polyrhythms and polymeters, plus a tap trainer that grades how tightly you actually play.

One idea, three layouts

The same scale, wherever you play it.

A mode isn’t three shapes to memorise — it’s one set of relationships. Here is the very same A Dorian, three times over.

A Dorian mapped across the guitar neck, tonics ringed in orange — Guitar — tonics ringed, six strings.

The same A Dorian on a four-string bass — Bass — same notes, four strings.

The same A Dorian laid out on the piano keys — Keys — same notes, laid flat.

The app listens

Play the chord. It checks you.

The chord course teaches shapes one at a time. Play the chord and the microphone listens: every note lights up green as it rings, and the lesson moves on by itself once the chord sounds clean.

Per-note feedback — see exactly which string isn't ringing.
Chord changes graded — switch between two chords in time, at a tempo you set.
Always skippable — a quiet room never blocks your progress.

Audio is analysed on your device in real time. Nothing is recorded, stored or sent anywhere.

A Dm chord lesson: notes light up green as they ring

Matching

To see a world in a grain of sand

Select the notes you like to play, and the app will find a scale that contains them, as well as chords and other structures associated with those notes, giving you more control over your improvisation right now.

Scale Library — browse and apply any scale or mode.
Scale 2 — hold two selections side by side and compare.
Interval strip — read the distances, not just the dots.

The interval circle naming each degree of Dorian: tonic, supertonic, mediant and so on

In motion

Easier to watch than to explain.

Learn

Theory that connects to your hands.

Chord course

A step-by-step path through chord shapes, with the microphone checking your sound and your chord changes.

17 harmony lessons

Short theory lessons with quizzes — keys, function, cadences — tied back to the neck instead of a textbook.

Chord reference

Every chord, A to Z, with voicings you can drop straight onto the fretboard or the keyboard.

Circle of fifths with a chord progression being built — Circle of fifths, borrowed chords and progressions in one place.

The microtonal tuner — Chromatic and microtonal tuning, down to the cent.

Privacy

Nothing leaves your device.

No account. No analytics. No third-party SDKs. No network requests at all — the app simply doesn't talk to a server.

Microphone audio is analysed in memory and never recorded or transmitted.
Your progress stays in local storage on the device.
Works fully offline, on a plane or in a basement rehearsal room.

Read the privacy policy