Pyrefly is an open-source Python type checker and language server offering fast type checking, IDE integration, and autocomplete. It helps developers catch errors and improve code quality, supporting large codebases and AI-generated code.
Pyrefly is an IDEs & code editors product. It enables developers to quickly check Python code for type errors and integrate advanced language features into their IDEs. Pyrefly is an open-source project aimed at python developers. The project is open source (MIT). The product ships for the web and the command line.
Meta Platforms, Inc. builds and maintains Pyrefly, and the product first shipped in 2025. The project is developed in the open on GitHub with 6.6k stars and 1.9k commits in the last 90 days. Across PulseGate's embedding index, Pyrefly has few near neighbours, marking it as relatively distinct. Among its 5 catalogued features are type checking, language server, and IDE integration.
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