Ruff

Web · Windows · Mac · Linux · Self-hosted

Freedom report

Three barsScore 6.6

Free tierA free tier is on its own pricing page
Open codeNo open-source code on record
Runs widely4 of 6 device platforms
DocumentedPlans, terms and facts published

Ruff is ranked #4 of 34 in code formatting tools on Freedom251. It runs on Linux, macOS, Self-hosted, Web, Windows. There is a free plan.

Ruff plans and pricing

All plans

Ruff Free Open-source Python linter and formatter · permissively licensed astral.sh · 29 Sept 2026

Compared on code formatting tools

Free plan: Yes

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The record

Purpose: Ruff is a Python linter and code formatter written in Rust.
Speed: The maker describes Ruff as 10–100x faster than existing linters and formatters such as Flake8 and Black.
Linting rules: Ruff includes over 900 built-in rules, including native implementations of popular Flake8 plugins.
Automatic fixes: Ruff can automatically fix lint violations, including removing unused imports.
Formatter: Ruff’s formatter is designed as a drop-in replacement for Black, though the FAQ notes there may be differences at the margins.
Editor support: The built-in Ruff Language Server provides diagnostics, code actions to fix them, and formatting; the docs recommend pairing it with another Python language server for navigation and autocompletion.
Editor integrations: The setup guide documents integrations including VS Code, Sublime Text, PyCharm, and Zed.
CI integrations: Ruff documents integrations for GitHub Actions and GitLab CI/CD, and hooks for pre-commit.
Installation: Ruff can be installed using uv, pip, pipx, standalone installers, and package managers including Homebrew and Conda.
Docker: The maker publishes Ruff as a Docker image tagged by release and with a latest tag.
Configuration: Ruff supports configuration through pyproject.toml, ruff.toml, or .ruff.toml.
Notable limit: Ruff does not support custom or third-party lint rules.
Security: Ruff’s rules include a Bandit-derived group for detecting common security issues, including possible vulnerabilities in Python code.
Support: The editor setup documentation says setup instructions are provided on a best-effort basis and directs users to open an issue for assistance.
Price from: Free

Where it ranks on Freedom251

Best Code Formatting Tools in 2026#4 of 34
Best Linters in 2026#4 of 33

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Sources

docs.astral.sh/ruff/· checked 29 Sept 2026
docs.astral.sh/ruff/faq/· checked 29 Sept 2026
docs.astral.sh/ruff/editors/· checked 29 Sept 2026
docs.astral.sh/ruff/editors/setup/· checked 29 Sept 2026
docs.astral.sh/ruff/integrations/· checked 29 Sept 2026
docs.astral.sh/ruff/installation/· checked 29 Sept 2026
docs.astral.sh/ruff/configuration/· checked 29 Sept 2026
docs.astral.sh/ruff/rules/· checked 29 Sept 2026
astral.sh/about· checked 29 Sept 2026