ty
Astral's new ultra-fast Rust-based Python type checker from the makers of ruff and uv — pre-1.0 but already widely adopted for its speed.
type-checking-frameworksRecently released
63
Hero Score
Popularity
84
Performance
100
Ecosystem
25
Maturity
38
Dev Experience
70
⭐ 18,803 stars⬇ 6.0M downloads/wkFirst release: Dec 2025Last release: May 2026
Async Support: YesPlugin Extensions: GrowingSpeed: Very fastDoc Quality: MediumLearning Curve: Easy
Pros
- • Rust implementation delivers order-of-magnitude speedups over mypy and pyright
- • Built by Astral with the same DX polish as ruff and uv — zero-config defaults that just work
- • LSP server ships in the same binary, giving editor and CI parity out of the box
Cons
- • Pre-1.0 — type semantics and CLI flags are still evolving and may break
- • Plugin ecosystem and framework-specific support (Django, SQLAlchemy) are not yet on par with mypy
- • Documentation is sparse compared to mypy and pyright