The app displays notes and chords on a beautiful Tonnetz lattice, so moving between related harmonies feels natural and musical. You can trigger chords or melodies with simple gestures, experiment with different tunings, and send MIDI straight to any host or hardware.
You can use it as a creative chord tool inside AUM or GarageBand via MIDI output. The free trial lets you test the full harmonic grid and MIDI output before deciding to unlock. At $9.99 the full version gives you unlimited access to all tunings and harmonic exploration — a different way to approach chord discovery if the traditional keyboard layout feels limiting.
Key features include:
- Interactive hexagonal Tonnetz grid for chords and scales
- Real-time chord and melody triggering
- MIDI output for controlling other apps
- Exploration of different tunings and harmonic relationships
App price: Free (7-day trial).
In-app purchases: Full unlock — $9.99 one-time.
Original release: 2017 | Latest update: March 2026 (now free model)
