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

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