Jazz Voicings · All 12 Keys
Play any jazz chord,in any key — without thinking.
Shells, rootless, ii-V-I — fluent in all 12 keys.
A MIDI keyboard checks you automatically. Otherwise use your mic or the on-screen keyboard.
3rd + 7th
New — your built-in coach
Open the app. Press play. The rest is planned.
A quick check finds where you stand. Every session after that is built for you.
- 01 Starts where you are Already play shells? You skip ahead.
- 02 Adapts every session Struggling? The coach stays right there until it sits.
- 03 Grows your range One step at a time, until all 12 keys feel like home.
“B♭7 shell sits now — next up: rootless voicings.” Your coach, after the session
The real thing
The same road a good teacher takes you down
The working jazz pianist's toolkit — voicing by voicing, through all 12 keys.
- 01 Shell voicings Root, 3rd and 7th — the skeleton of jazz harmony Cmaj7·C · E · B
- 02 6th & 9th colors The first color notes that make chords sound like jazz C6/9·C · E · A · D
- 03 Rootless voicings in progress The Bill Evans sound — what pros actually play Dm9·F · A · C · E
- 04 Inversions & voice leading Move between chords with barely moving your hand G7/B·B · F · G
- 05 Altered & upper structures Tension and release — the grown-up dominant sounds G7♯5♭9·B · F · A♭ · E♭
The next step unlocks when the current one sits — not before.
The twelve keys
Everyone avoids five keys. Yours are on this dial.
C → G → D → A → E → B
Your dial, once you have played a session.
The ring grows outward where your hands hesitate. Untouched keys stay hollow.
- Fluent
- Hesitant
- Never played
Practice without a piano
The train, the lunch break, the walk to rehearsal.
Ear, time and theory need no keys — just headphones. Seven disciplines, eight quick rounds, about three minutes.
- 01 Intervals Two notes — name the distance.
- 02 Chord colours Hear a chord, name its quality.
- 03 Progressions Hear a cadence, name the shape.
- 04 Singing Find a chord tone with your voice. microphone
- 05 Time Tap the groove against the click.
- 06 Licks Hear a phrase, tap it back.
- 07 Theory Silent flashcards — works anywhere. silent
What you train here counts towards the same ear map as the piano work.
Open To-GoInstant feedback
It doesn't just show you chords. It hears you play them.
Every chord is checked as you play — octave-tolerant, auto-advancing the moment you nail it.
- MIDI keyboard
- Microphone
- On-screen keyboard
Five minutes a day
Small sessions. Compounding results.
Nothing to plan, nothing to track. Just sit down and play.
“E♭maj7 is 31% faster than last week. Tomorrow, B♭7 again.” After-session feedback
Questions, answered
Questions, answered
What is a jazz piano voicing?
A specific arrangement of the notes in a chord. Instead of stacking from the root, jazz pianists play shells, rootless voicings and inversions — in all 12 keys.
Do I need to know jazz already?
No. If you can find notes on a keyboard, the coach starts you on simple shells. If you already play, you skip ahead.
Can I practice with a MIDI keyboard?
Yes — via USB or Bluetooth (Chrome or Edge on desktop). No MIDI? The microphone or the on-screen keyboard work too.
How much time do I need?
Five minutes a day is a real session. Consistency beats marathon practice.
Is it free?
Yes. Every training feature, no account needed. A free account syncs your progress across devices; an optional Pro plan adds deeper statistics.
Fine
Your coach is ready when you are.
The first session takes three minutes.
Free. No signup. Works with or without a keyboard.