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Ruff vs ESLint: open-source code quality and static analysis tools compared

Metrics as of , from the GitHub or GitLab API of each repository. Refreshed monthly.

Summary

Ruff: Python linter and code formatter written in Rust that covers Flake8, Black and isort functions in one tool.

ESLint: Pluggable linter that finds and reports patterns in JavaScript code using configurable rules.

Both are listed under Code quality and static analysis. The table gives repository metrics from the GitHub API with their fetch date, then the documented facts used for every comparison in this category, each linked to the README or docs page it comes from. A cell reads "not documented" when the fact was not found in the project's documentation; that does not mean the feature is absent.

Side by side

Ruff and ESLint: metrics and documented facts, in the fixed row order used for code quality and static analysis comparisons.
FactRuffESLint
Stars49,731127,5161
Forks2,43015,1891
Contributors97911,2491
Last release2026-09-1612026-09-181
Last commit2026-09-2212026-09-221
Commits in 90 days1,44711891
LicenseMIT1MIT1
Primary languageRust1JavaScript1
Statusactive1active1
Languages or files analysedPython files (*.py, *.pyi), Jupyter Notebooks (*.ipynb) and pyproject.toml source: Docs: Configuring RuffECMAScript/JavaScript code; JSX parsing when enabled source: README
Configuration formatTOML settings in pyproject.toml, ruff.toml or .ruff.toml source: READMEJavaScript config file (eslint.config.js) source: README
CI integrationGitHub Actions (ruff-action) and a GitLab CI/CD example with a code quality report source: Docs: IntegrationsIntegrations page lists Mega-Linter, a community linters aggregator for CI that embeds ESLint source: Docs: Integrations
Report formatsconcise, full, JSON, JSON Lines, JUnit, grouped, GitHub, GitLab, Pylint, rdjson, Azure, SARIF source: Docs: Configuring Ruffhtml, json, json-with-metadata, stylish; third-party formatters source: Docs: Formatters Reference
Install methodPyPI package ruff via uv, pip or pipx; standalone installers source: READMEnpm (npm init @eslint/config@latest) source: README

1 Fetched from the GitHub or GitLab API on . Hover a value for its own date.

When each fits

Written from each project's documented scope, not from preference. Neither tool is ranked.

Ruff

Fits projects that lint and format Python code with one tool; its README describes use in place of Flake8, Black, isort, pydocstyle, pyupgrade and autoflake. source: README

ESLint

Fits projects that lint ECMAScript/JavaScript code; its README describes a design in which every rule is a plugin and more rules can be added at runtime. source: README

More on these tools

Sources

  1. GitHub REST API: repository, read
  2. GitHub REST API: repository, read
  3. GitHub REST API: contributors, read
  4. GitHub REST API: contributors, read
  5. GitHub REST API: latest release, read
  6. GitHub REST API: latest release, read
  7. GitHub REST API: commits, read
  8. GitHub REST API: commits, read
  9. Docs: Configuring Ruff, read
  10. README, read
  11. README, read
  12. Docs: Integrations, read
  13. Docs: Integrations, read
  14. Docs: Formatters Reference, read

Documented facts collected 2026-09-22. See the methodology for how metrics and facts are gathered.