Jazz Voicings · All 12 Keys
Play any jazz chord, in any key — without thinking.
Drill voicings until they are muscle memory. Shells, rootless, ii-V-I — fluent in all 12 keys, one short session at a time.
Have a MIDI keyboard? It auto-checks you. No keyboard? Use your mic or self-check. Your call.
Free. No signup. Works with or without a keyboard.
CMaj7
Shell Voicing
C–E–B
01
See the chord
Your job: recall the shape and find it under your fingers — the exact skill real playing demands.
Shells, rootless & more ii-V-I in all 12 keys
02
Play it
Play the voicing and get instant feedback — right or wrong, every time. Connect a MIDI keyboard for auto-checking, or use your mic.
Instant feedback MIDI, mic or tap
03
Watch your weak keys disappear
The app tracks which keys slow you down and drills them harder. Session by session, the hesitation goes away.
Weak-spot targeting Guided practice plans
Ready to stop thinking and start playing?
No account. No install. Pick a chord and go.
Start Practicing