RuboCop
Metrics as of , from the GitHub or GitLab API of each repository. Refreshed monthly.
What RuboCop is
RuboCop is a static code analyzer (linter) and code formatter for Ruby. By default it enforces guidelines from the community Ruby Style Guide. It reports problems in code and can correct many of them automatically. Configuration options adjust most of its behavior. It runs from the command line inside a project folder. A built-in LSP server connects it to editors. It runs on MRI 2.7+ and JRuby 9.4+. Code analysis targets Ruby 2.0 and later. Installation uses a gem or a Gemfile entry through Bundler.
Written from the project's README, read .
- Category
- Code quality and static analysis
- License
- MIT
- Language
- Ruby
- Changelog
- Releases on GitHub
Repository metrics
Status
activeLast commit within 90 days of the fetch date.Computed from the last commit date and the archive flag on the fetch date. See the status rules.
Alternatives
Listed code quality and static analysis tools, same primary language first, then by GitHub stars. Each line gives one fact from the tool's documentation where it differs from RuboCop's, with its source.
Ruff: Languages or files analysed: Python files (*.py, *.pyi), Jupyter Notebooks (*.ipynb) and pyproject.toml. source: Docs: Configuring Ruff
ShellCheck: Languages or files analysed: Shell scripts in the sh, bash, dash, ksh and BusyBox dialects. source: Docs: shellcheck(1) manual
ESLint: Languages or files analysed: ECMAScript/JavaScript code; JSX parsing when enabled. source: README
mypy: Languages or files analysed: Python programs with type hints. source: README
golangci-lint: Languages or files analysed: Go code. source: README
Semgrep: Languages or files analysed: Community supported in Semgrep CE: C/C++, C#, Go, Java, JavaScript, TypeScript, Kotlin, Python, Ruby, Rust, PHP, Scala, Swift, Terraform. source: Docs: Supported languages for Semgrep Community Edition (CE)
Infer: Languages or files analysed: Java, C++, Objective-C and C. source: README
PHPStan: Languages or files analysed: PHP code. source: README
How to install
gem install rubocopQuestions
Is RuboCop open source?
Yes. RuboCop is released under MIT, an OSI-approved license, as reported by the GitHub API on 2026-09-22.
Is RuboCop maintained?
On 2026-09-22, the last commit to the default branch was on 2026-09-22, so the listed status is active. Rule: Last commit within 90 days of the fetch date.
How many GitHub stars does RuboCop have?
12,905 stars on 2026-09-22, from the GitHub API. The number is refreshed at each monthly update.
What language is RuboCop written in?
The repository's primary language, as reported by the GitHub API, is Ruby.
How do I install RuboCop?
The README gives this command: gem install rubocop
Sources
- GitHub REST API: repository, read
- GitHub REST API: commits, read
- GitHub REST API: latest release, read
- GitHub REST API: contributors, read
- README, read