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
Jun 19, 2026 at 07:45
License
MIT
Supported Platforms
macOS-64
macOS-arm64
win-64
linux-aarch64
linux-64
Home
http://pyrefly.org/GitHub Repository
https://github.com/facebook/pyreflyDocumentation
https://pyrefly.org/en/docs/