Leon

Judgement

What it is

Complete system

What it does

An open-source personal assistant that runs on your server, with speech recognition and synthesis, skills and LLM integration.

Adopt it when

You want to experiment with a self-hosted voice assistant you can extend.

Watch out

Long-running rewrite with no releases, so it is not a dependable daily assistant.

Ready for

Experimental

Runs as

Self-hosted server

Built with

TypeScript, Python, Node.js and Fastify

How established

Established: started 7 years ago, no tagged release yet.

What the license allows

You can build it into a product you sell, as long as you keep its copyright notice.

Judged on 2026-11-03 from the project's README and GitHub data. The license and age lines are worked out directly.

Built from

Follow it down: Leon → TypeScript → Go → runs on a microchip

How compilers were built, back to punched paper tape

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