astral-sh/ruff
★ 49,901 stars
Covered in week 2026-W27 · the 2026-07 report
An extremely fast Python linter and code formatter, written in Rust.
What ruff is
Ruff aims to be orders of magnitude faster than alternative tools while integrating more functionality behind a single, common interface.
From the repository README · read it on GitHub →
Transcript
Stop paying $19/mo for SonarCloud to lint and clean your Python code. This does the exact same job, completely free. Imagine scanning a million lines of Python in milliseconds. 100x faster than Flake8, catching bugs the moment you save. No bloated setup, no slow CI pipelines, no waiting around required. That's Ruff. 38,000 GitHub stars and climbing. One Rust tool replaces Flake8, Black, isort, and pyupgrade, fixing errors instantly. Is SonarCloud in trouble? Comment your take.