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Black vs Ruff: catalog facts
Black	Ruff
Free Free and open source under the MIT licence.	Free The open-source application is available without a license fee.
Windows, macOS, Linux, Command line	Windows, macOS, Linux
Deterministic output with minimal configuration Produces small diffs that ease code review	Linting, formatting and fix support in one tool
Deliberately few options, so the style cannot be tuned much Python only	It does not replace running your program or its tests.
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: MIT
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 22, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.