# ty

> MIT Astral Python type checker (beta) in Rust

**Category:** Python  
**Pricing:** open-source  
**URL:** https://docs.astral.sh/ty/  
**GitHub:** https://github.com/astral-sh/ty  
**Added:** 2026-09-04

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## The Hook

ty is Astral Rust type checker when mypy or Pyright is the baseline you are measuring against.

## What's Good

MIT. Extremely fast Python type checker and language server from the uv/Ruff team. uvx ty check to try. Incremental analysis aimed at IDE speed.

## The Catch

Beta/maturing vs mypy/pyright — say so. Do not invent pass rates or claim it already replaces either tool on every codebase. Distinct from Ruff (lint/format) even though same vendor.

## Verdict

MIT Astral type checker. Fast and young — measure it; do not invent scores.