pyrefly
A fast type checker and IDE for Python
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Description
Pyrefly is a fast type checker for Python. It's designed to replace the existing Pyre type checker at Meta by the end of 2025. This README describes basic usage. See the Pyrefly website for full documentation and a tool for checking code.
About
Summary
A fast type checker and IDE for Python
Last Updated
Dec 24, 2025 at 00:48
License
MIT
Total Downloads
34.0K
Supported Platforms
win-64
linux-aarch64
macOS-64
macOS-arm64
linux-64
Home
http://pyrefly.org/GitHub Repository
https://github.com/facebook/pyreflyDocumentation
https://pyrefly.org/en/docs/