astral-sh/ruff
Why Python developers replaced Flake8 and Black with Ruff
Your Python CI pipeline spends five minutes running slow linters.
Chaining multiple legacy Python linters creates severe local and CI latency.
Running Flake8, Black, and isort separately forces Python to reparse your abstract syntax tree multiple times, slowing down every git commit.
Ruff executes 100 times faster by compiling directly to native Rust.
Written from scratch in Rust, Ruff processes abstract syntax trees in parallel, linting hundreds of thousands of lines in fractions of a second.
A single unified binary replaces five separate Python development tools.
Instead of maintaining separate dependencies and config files, Ruff consolidates linting, import sorting, and code formatting into one tool.
Automatically autofix hundreds of lint violations in a single command.
With the fix flag, Ruff automatically restructures imports, removes unused variables, and modernizes syntax across your entire project instantly.
Over 35,000 stars on GitHub. Open-source under MIT license.
Adopted by major projects like FastAPI, Hugging Face, and Pandas, Ruff has become the undisputed gold standard for modern Python development.