Ruff
Ruff: Free Python linting and formatting with more than 900 built-in rules. Ranked #2 of 33 in Linters by our editors (9.2/10); pricing: Free plan; best for python teams wanting linting and formatting together.
At a glance
- Editor score9.2 / 10
- PricingFree plan
- Best forPython teams wanting linting and formatting together
- Free planYes
- Paid fromFree
- CI supportYes
- Facts checked21 Sep 2026
Where it wins
- More than 900 built-in lint rules
- Automatic fixes and built-in Python formatting
- Editor, notebook, CI, pre-commit, and Docker integrations
Where it doesn't
- Focused on Python rather than multiple languages
- Custom lint rules are not supported
- Third-party plugins are not supported
Our verdict on Ruff
Ruff is an open-source Python linter and code formatter for developers and teams. It checks Python files with the ruff check command, automatically fixes supported violations, and formats Python code. Its focus suits Python projects that want linting and formatting in one tool, particularly teams working across Windows, macOS, or Linux.
The feature set covers both everyday editing and automated checks. Ruff provides more than 900 built-in lint rules, including rules for unused imports, docstring formatting, and type-annotation rewrites. Configuration works through pyproject.toml, ruff.toml, and .ruff.toml. Language Server Protocol integration supports editor workflows, while Jupyter Notebook linting and formatting extends coverage beyond standard Python files. Integrations include VS Code, Neovim, Vim, Helix, Kate, Sublime Text, PyCharm, Emacs, TextMate, Zed, pre-commit, and Docker. GitHub Actions and GitLab CI/CD integrations also support automated project checks.
Ruff is free and open source, with no paid tier required for the listed linting and formatting capabilities. It also supports security rules and automatic fixes, but custom lint rules and third-party plugins are not supported. That makes Ruff a strong fit for teams comfortable with its built-in rule set and Python-only scope. Teams needing custom rule authoring, third-party plugin support, or linting across multiple programming languages should choose a different tool or use Ruff alongside another solution.
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Ruff pricing
Ruff fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| Languages supported | 1 |
| Autofix | Yes |
| Custom rules | No |
| Security rules | Yes |
| IDE support | Ide |
| CI support | Yes |
| Deployment | Self-hosted |
| Platforms | Web, Windows, macOS, Linux |
| Support | Docs |
| Built for | Solo, Small business, Mid-market, Enterprise (editorial estimate) |
| Integrations | 10 integrations: GitHub Actions, GitLab CI/CD, pre-commit, Docker, VS Code, Neovim … |
| Pricing | Free plan |
| Website | docs.astral.sh |
| Facts checked | 21 Sep 2026 |
Ruff integrations
Ruff lists 10 integrations on its own site.
- GitHub Actions
- GitLab CI/CD
- pre-commit
- Docker
- VS Code
- Neovim
- Helix
- PyCharm
- Sublime Text
- Zed
Alternatives to Ruff
- ESLintA free, extensible JavaScript linter with autofix, plugins, and broad developer-tool integrations.9.4
- ShellCheckA free, open-source linter for shell syntax, portability, robustness and security checks.9.0
- StylelintA capable, extensible CSS linter for teams that want configurable rules and CI support.8.8
Ruff vs the competition
Compare Ruff with any tool side by side →
Also Ranked In
Ruff is ranked in 2 of our directories.
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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