# Pyrefly

> Fast Python type checker

Meta's type checker and language server.

- Source: https://github.com/meta/pyrefly
- Homepage: http://pyrefly.org/
- License: MIT
- Built with: Rust 80.6%, Python 13.8%, MDX 3.1%, TypeScript 2.1%, Other 0.4%
- Stars: 7163 (+418 in the last 90 days)
- Forks: 579
- Contributors: 303
- Last commit: 2026-10-29
- Latest release: 1.4.0 (2026-10-15)
- Purpose: Developer tools
- Type: CLI
- For: Personal, Enterprise

## Worth score: 74/100

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

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

## Downloads

Latest release: [Pyrefly v1.4.0](https://github.com/meta/pyrefly/releases/tag/1.4.0). Files from the project's GitHub release, not checked by DigGitHub.

Windows:

- [pyrefly-windows-x86_64.zip](https://github.com/meta/pyrefly/releases/download/1.4.0/pyrefly-windows-x86_64.zip) (15 MB, 186 downloads)
- [pyrefly-windows-i686.zip](https://github.com/meta/pyrefly/releases/download/1.4.0/pyrefly-windows-i686.zip) (14 MB, 20 downloads)
- [pyrefly-windows-arm64.zip](https://github.com/meta/pyrefly/releases/download/1.4.0/pyrefly-windows-arm64.zip) (14 MB, 37 downloads)

macOS:

- [pyrefly-macos-arm64.tar.gz](https://github.com/meta/pyrefly/releases/download/1.4.0/pyrefly-macos-arm64.tar.gz) (14 MB, 212 downloads)
- [pyrefly-macos-x86_64.tar.gz](https://github.com/meta/pyrefly/releases/download/1.4.0/pyrefly-macos-x86_64.tar.gz) (15 MB, 17 downloads)

Linux:

- [pyrefly-linux-arm64.tar.gz](https://github.com/meta/pyrefly/releases/download/1.4.0/pyrefly-linux-arm64.tar.gz) (14 MB, 25 downloads)
- [pyrefly-linux-i686.tar.gz](https://github.com/meta/pyrefly/releases/download/1.4.0/pyrefly-linux-i686.tar.gz) (16 MB, 5 downloads)
- [pyrefly-linux-arm64-musl.tar.gz](https://github.com/meta/pyrefly/releases/download/1.4.0/pyrefly-linux-arm64-musl.tar.gz) (14 MB, 20 downloads)
- [pyrefly-linux-x86_64-musl.tar.gz](https://github.com/meta/pyrefly/releases/download/1.4.0/pyrefly-linux-x86_64-musl.tar.gz) (15 MB, 760 downloads)
- [pyrefly-linux-x86_64.tar.gz](https://github.com/meta/pyrefly/releases/download/1.4.0/pyrefly-linux-x86_64.tar.gz) (15 MB, 254 downloads)

Other files:

- [pyrefly-wasm.tar.gz](https://github.com/meta/pyrefly/releases/download/1.4.0/pyrefly-wasm.tar.gz) (6.9 MB, 13 downloads)

To check the files: [pyrefly-wasm.tar.gz.sha256](https://github.com/meta/pyrefly/releases/download/1.4.0/pyrefly-wasm.tar.gz.sha256), [pyrefly-linux-arm64.tar.gz.sha256](https://github.com/meta/pyrefly/releases/download/1.4.0/pyrefly-linux-arm64.tar.gz.sha256), [pyrefly-linux-i686.tar.gz.sha256](https://github.com/meta/pyrefly/releases/download/1.4.0/pyrefly-linux-i686.tar.gz.sha256), [pyrefly-linux-arm64-musl.tar.gz.sha256](https://github.com/meta/pyrefly/releases/download/1.4.0/pyrefly-linux-arm64-musl.tar.gz.sha256), [pyrefly-linux-x86_64-musl.tar.gz.sha256](https://github.com/meta/pyrefly/releases/download/1.4.0/pyrefly-linux-x86_64-musl.tar.gz.sha256), [pyrefly-linux-x86_64.tar.gz.sha256](https://github.com/meta/pyrefly/releases/download/1.4.0/pyrefly-linux-x86_64.tar.gz.sha256), [pyrefly-macos-arm64.tar.gz.sha256](https://github.com/meta/pyrefly/releases/download/1.4.0/pyrefly-macos-arm64.tar.gz.sha256), [pyrefly-windows-x86_64.zip.sha256](https://github.com/meta/pyrefly/releases/download/1.4.0/pyrefly-windows-x86_64.zip.sha256), [pyrefly-windows-i686.zip.sha256](https://github.com/meta/pyrefly/releases/download/1.4.0/pyrefly-windows-i686.zip.sha256), [pyrefly-windows-arm64.zip.sha256](https://github.com/meta/pyrefly/releases/download/1.4.0/pyrefly-windows-arm64.zip.sha256), [pyrefly-macos-x86_64.tar.gz.sha256](https://github.com/meta/pyrefly/releases/download/1.4.0/pyrefly-macos-x86_64.tar.gz.sha256)

## Alternatives

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

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Source page: https://diggithub.com/meta/pyrefly
Updated: 2026-10-29