GStars
    meta

    meta/pyrefly

    A fast type checker and language server for Python

    developer-tools
    code-quality
    ide
    language-server
    language-server-protocol
    lsp
    Rust
    MIT
    7.2K stars
    592 forks
    22 GitHub watchers
    Updated Nov 8, 2026
    View on GitHub

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    Where it stands

    Rank, growth pace and release cadence relative to everything GStars tracks.

    5 releases in the last 90 days, the latest 2 days ago, with 338 contributors on GitHub.

    Peaked at #30 in the weekly ranking the week of Nov 30, its best in the past year.

    Use Cases & Benefits

    • Provides a fast type checker and language server for Python to improve code quality and IDE support.
    • Delivers high performance and large-scale incremental type checking using Rust and module-level parallelism.
    • Use for integrating efficient type checking and type inference into Python development workflows.
    • Use for enhancing IDEs like VSCode with real-time Python type checking and language server features.
    • Use for analyzing and refining Python codebases with complex control flow and type annotations.

    Should you depend on it?

    License terms, project hygiene and risks, from GitHub metadata and GStars' snapshots.

    License

    MIT

    Permissive: commercial use, modification and redistribution are allowed with attribution.

    Community files

    • README: present
    • Contributing guide: present
    • Code of conduct: present

    Watch-outs

    No watch-outs from GStars' checks.

    General guidance from repository metadata, not legal advice. How we score

    From the README

    Currently under active development with known issues. Please open an issue if you find bugs.

    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.

    Pyrefly aims to increase development velocity with IDE features and by checking your Python code.

    Excerpt from the meta/pyrefly README on GitHub (MIT license). © its authors.Read the full README on GitHub

    Daily snapshots

    Stars gained per day, and how forks and open issues moved, from GStars' daily snapshots

    Sep 1: +0Sep 13: +3

    +302 stars over 85 days across 9 snapshot days; best day +3 on Sep 13.

    Forks

    592+113

    Open issues

    576-105

    Compared with peers in Developer Tools

    Fastest-growing repositories GStars tracks in this cohort for the week of Nov 8, by 7-day star growth

    View category →
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    max-sixty/worktrunk12.4K+1.9K7521 days ago
    meta/pyrefly7.2K—652 days ago
    Category median121.4K+4.3K75—
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