pyrefly

Alternative to JetBrains PyCharm

A fast type checker and language server for Python

7.0k 528

MIT

last commit 2026-07-08

code-quality ide language-server language-server-protocol lsp python rust type-annotations type-check type-checker

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A fast type checker and language server for Python

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Rust79.8%Python14.9%MDX3%TypeScript2%Shell0.1%JavaScript0.1%CSS0%HTML0%Thrift0%Starlark0%Cap'n Proto0%Jupyter Notebook0%

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Free alternative to JetBrains PyCharm

pyrefly is a free, open-source alternative to JetBrains PyCharm. Here's why:

🚀 Blazing Fast Checks
💡 Smart Type Inference
✅ Catch Errors Early
⚡️ LSP for Any Editor
🐍 Enhanced Python Dev

See all open-source alternatives to JetBrains PyCharm

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Cargo

Keywords

code-quality

ide

language-server

language-server-protocol

slug: pyrefly