Two ways to play with the engine.
Same harmony engine as the API, pointed at practice rooms and writing desks instead of build systems. The Elk Stomp run is a measurement, not a product.
Run the Changes
A practice tool that holds you to the chart. It generates the changes, voices them correctly, and keeps the harmony honest while you play over it — so what you hear in the room is what the tune actually does.
- LicenceOne-time, yours
- EngineDeterministic voicings
- ForPlayers, teachers, studios
$99.99
Studio licence: talk to us.
Composer C
The writing surface. Sketch a progression, reharmonise it, hear it voiced properly, and keep the result because it will be the same result tomorrow.
- LicenceMonthly
- Wherecomposer.thiri.ai
- ForWriters and arrangers
$19/mo
If you build instead of play
The same engine is a hosted API and MCP. Mint a key, then call it. Developers · mcp.thiri.ai · Get a key · Licensing