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DEVELOPERS · OPEN SOURCE

Built in Rust. Open at the contracts.

The types, VAD and open-weight adapters are Apache 2.0. Build with the same contracts we build on.

Browse the cratesGet early access
letsy-types☆ —

Session, event and audio-frame contracts. The types everything speaks.

Apache-2.0Rust
letsy-vad☆ —

Voice activity detection tuned for conversation, not dictation.

Apache-2.0Rust
letsy-adapters☆ —

Open-weight model adapters — Voxtral and friends.

Apache-2.0Rust
GitHub → github.com/letsylabsCOMING SOONLETSY-PY: 2027
PHILOSOPHY — HONESTLY STATED

Open contracts, so you're never locked in.
Closed runtime, so we can build a business.
More opens up as the community grows.