Ruff vs Credo

Ruff9.2Visit Credo8.5Visit

Higher score Ruff #2 in Linters 9.2/10 Free plan Free plan✓ 3 of 4 features Visit Ruff

vs

Credo #7 in Linters 8.5/10 Free plan Free plan✓ 3 of 4 features Visit Credo

• Ruff fits best

  Python teams wanting linting and formatting together

• Credo fits best

  Elixir teams checking style and complexity

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Side by side

Feature	Ruff 9.2/10 Visit ↗	Credo 8.5/10 Visit ↗
At a glance
Editor score	9.2	8.5
Ranking	#2 in Linters	#7 in Linters
Best for	Python teams wanting linting and formatting together	Elixir teams checking style and complexity
Pricing model	Free	Free
Starting price	Free plan	Free plan
Free plan	✓	✓
Free trial	—	—
Deployment	Self-hosted	Self-hosted
Support	Docs	Docs
Integrations	10 integrations	7 integrations
Built for	Solo, Small business, Mid-market, Enterprise	Small business, Mid-market, Enterprise
Features Ruff 3/4 · Credo 3/4
Autofix	✓ (best)	Not checked yet
Custom rules	—	✓ (best)
Security rules	✓	✓
CI support	✓	✓
Specs
Languages supported	1	1
IDE support	Ide	Ide
Our review
Pros	More than 900 built-in lint rules Automatic fixes and built-in Python formatting Editor, notebook, CI, pre-commit, and Docker integrations	Covers mistakes, style, refactoring, and complexity findings Supports strict mode, explanations, JSON, and SARIF output Offers custom checks, plugins, and broad editor integrations
Cons	Focused on Python rather than multiple languages Custom lint rules are not supported Third-party plugins are not supported	Supports Elixir rather than multiple programming languages Installation and use center on Mix and the command line Teams may need another tool for broader language coverage
Our verdict	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… Read the review →	Credo is an open-source static code analysis tool for Elixir projects. It is aimed at developers and teams that want consistent style, maintainable code, and earlier feedback on common mistakes. Its checks cover naming, coding style,… Read the review →

Strengths and trade-offs

• Ruff — 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

• Credo — where it wins

  • Covers mistakes, style, refactoring, and complexity findings
  • Supports strict mode, explanations, JSON, and SARIF output
  • Offers custom checks, plugins, and broad editor integrations

  Where it doesn't

  • Supports Elixir rather than multiple programming languages
  • Installation and use center on Mix and the command line
  • Teams may need another tool for broader language coverage

• Ruff9.2/10 · Free plan

  Free Python linting and formatting with more than 900 built-in rules.

  Visit RuffFull verdict →
• Credo8.5/10 · Free plan

  A focused, free Elixir linter for style, complexity, refactoring, and custom checks.

  Visit CredoFull verdict →