Meta Open Sources Pyrefly A High Performance Python Type Checker Get lightning fast autocomplete, and catch errors with instant feedback in your favorite editor. have questions or feedback to share? connect with us on discord. copyright © 2026 meta platforms, inc. built with docusaurus. Today we are announcing an alpha version of pyrefly, an open source python type checker and ide extension crafted in rust. pyrefly is a static type checker that analyzes python code to ensure type consistency and help you catch errors throughout your codebase before your code runs.
Meta Open Sources Pyrefly A High Performance Python Type Checker Pyrefly is a type checker and language server for python, which provides lightning fast type checking along with ide features such as code navigation, semantic highlighting, and code completion. Currently in alpha, pyrefly is a new open source python type checker developed by meta in rust for maximum performance. inspired by tools like pyre, pyright, and mypy, pyrefly is intended to. Pyrefly is a faster, open source python type checker written in rust, succeeding pyre. but what prompted the rewrite—and what besides the language choice made it dramatically faster?. Currently in alpha, pyrefly is a new open source python type checker developed by meta in rust for maximum performance. inspired by tools like pyre, pyright, and mypy, pyrefly aims to replace the ocaml based pyre type checker previously used for instagram's codebase.
Meta Open Sources Pyrefly A High Performance Python Type Checker In Pyrefly is a faster, open source python type checker written in rust, succeeding pyre. but what prompted the rewrite—and what besides the language choice made it dramatically faster?. Currently in alpha, pyrefly is a new open source python type checker developed by meta in rust for maximum performance. inspired by tools like pyre, pyright, and mypy, pyrefly aims to replace the ocaml based pyre type checker previously used for instagram's codebase. Meta has released pyrefly as an open source beta, offering up to 95% faster type checking and inviting global developers to contribute to the future of python tooling. Pyrefly is a type checker and language server for python, which provides lightning fast type checking along with ide features such as code navigation, semantic highlighting, and code completion. it is available as a command line tool and a vscode extension. Meta releases pyrefly, a fast python type checker and language server written in rust with module level incrementality and flow sensitive type refinement. python's type checking ecosystem gains another high performance option alongside mypy and pyright. Pyrefly is a new, open source type checker and ide language server from meta, written in rust, with a focus on instant feedback and real world dx. today, we will dig into what it is, why it exists, and how it plays with the rest of the typing ecosystem.
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