Ty

lastmod 2026-01-11created 2025-05-083 edits

Fast Python type checker and language server

Features

• ty is an extremely fast Python type checker and language server written in Rust
• Still pre-release software, not ready for production use
• Developed in the repository of Ruff, Astral's ultra-fast Python linter, aiming for stability and feature completeness
• MIT license

See also

• Python
• mypy
• Ruff - 10-100x faster Python linter
• Astral - Company building next-generation Python developer tools

Favorite site

• Github - astral-sh/ty
• Ty - Fast Python type checker and language server | GeekNews
• Comparing Pyrefly and Ty, two new Rust-based type checkers for Python | GeekNews (Pyrefly, Ty)
• From Mypy to Ty: an ultra-fast Rust-based Python type checker from the makers of Ruff | GeekNews