# Pyrefly

> Fast Python type checker

Meta's type checker and language server.

- Source: https://github.com/facebook/pyrefly
- Homepage: http://pyrefly.org/
- License: MIT
- Language: Rust
- Stars: 7044
- Forks: 534
- Contributors: 284
- Last commit: 2026-10-04
- Latest release: 1.3.2 (2026-09-28)
- Purpose: Developer tools
- Runs on: CLI
- For: Personal, Enterprise

## Worth score: 73/100

How much DigGitHub recommends it, from activity, adoption, docs, license and security signals.

- Popularity: 19/25
- Momentum: 10/20
- Maintenance: 25/25
- Community: 11/15
- Readiness: 8/15

## Alternatives

- [TypeScript](https://diggithub.com/microsoft/TypeScript.md): JavaScript with static types

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Source page: https://diggithub.com/facebook/pyrefly
Updated: 2026-10-04