# ty

> ty is an extremely fast Python type checker and language server built in Rust by Astral, the makers of Ruff.

ty is an extremely fast Python type checker and language server written in Rust, developed by Astral (the team behind Ruff). It is designed to bring high-performance static type analysis to Python projects, catching type errors before runtime. ty integrates as a language server to provide real-time diagnostics, hover information, and code intelligence directly in your editor.

- **Blazing-fast type checking** — *Written in Rust for maximum performance, ty analyzes Python codebases significantly faster than traditional type checkers.*
- **Language server protocol (LSP) support** — *Provides real-time type diagnostics, hover types, and go-to-definition in any LSP-compatible editor.*
- **Python type inference** — *Infers types across your codebase without requiring explicit annotations everywhere.*
- **CLI interface** — *Run `ty check` from the command line to get type errors across your project instantly.*
- **Early-stage / pre-release** — *ty is currently in active development and pre-release; install via `pip install ty` or from the GitHub releases page.*
- **Astral ecosystem** — *Built by the same team behind Ruff, designed to complement fast Python tooling workflows.*

## Features
- Python type checking
- Language server protocol (LSP)
- Type inference
- CLI type checker
- Real-time diagnostics
- Go-to-definition
- Hover type information
- Written in Rust for performance

## Integrations
Ruff, VS Code, Neovim, Any LSP-compatible editor

## Platforms
WEB, API, VSC_EXTENSION, CLI

## Pricing
Open Source

## Links
- Website: https://docs.astral.sh/ty/
- Documentation: https://docs.astral.sh/ty/
- Repository: https://github.com/astral-sh/ty
- EveryDev.ai: https://www.everydev.ai/tools/ty