Post

Today, we’re announcing the preview release of ty, an extremely fast type checker and language server for Python, written in Rust. In early testing, it's 10x, 50x, even 100x faster than existing type checkers. (We've seen >600x speed-ups over Mypy in some real-world projects.)

With the preview release, we don't expect ty to be usable in production. It's feature-incomplete, and you should expect to encounter bugs or even fatal errors.

Instead, this release is about giving users a _preview_ of what to expect from ty, and a call to follow along as we work towards a stable release later this year.

Like Ruff and uv, ty is open-source and MIT-licensed, so you can use the same tool on the command line, in CI, in any editor, across your team, etc.