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Top 22 Ruby Linter Projects
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SaaSHub
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undercover
undercover warns about methods, classes and blocks that were changed without tests, to help you easily find untested code and reduce the number of bugs. It does so by analysing data from git diffs, code structure and SimpleCov coverage reports
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rubocop-obsession
RuboCop extension focused on higher-level concepts, like checking that code reads from top to bottom
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Rubyzen
Rubyzen is a modern linter for Ruby that allows you to write architectural lint rules as unit tests. In the era of AI-generated code, Rubyzen provides your team with deterministic guardrails to keep your codebase clean, maintainable, and consistent as it grows.
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NOTE:
The open source projects on this list are ordered by number of github stars.
The number of mentions indicates repo mentiontions in the last 12 Months or
since we started tracking (Dec 2020).
Ruby Linter discussion
Ruby Linter related posts
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Rubocop-obsession: RuboCop extension focused on higher-level concepts
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Five Things to Avoid in Ruby
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Utilities for refactoring and upgrading Ruby code based on ASTs
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Am I the only one who doesn't put parentheses around the parameters in Ruby method definitions?
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A decent VS Code and Ruby on Rails setup
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Standardrb: Ruby's bikeshed-proof linter and formatter
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A Writer's Ruby
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A note from our sponsor - SaaSHub
www.saashub.com | 8 Jun 2026
Index
What are some of the best open-source Linter projects in Ruby? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | rubocop | 12,878 |
| 2 | standard | 2,900 |
| 3 | rubocop-rails | 877 |
| 4 | undercover | 838 |
| 5 | rubocop-performance | 739 |
| 6 | rubocop-graphql | 245 |
| 7 | rubocop-minitest | 160 |
| 8 | rubocop-obsession | 141 |
| 9 | rubocop-gradual | 38 |
| 10 | Rubyzen | 14 |
| 11 | rubocop-ruby2_1 | 6 |
| 12 | rubocop-ruby2_3 | 6 |
| 13 | rubocop-ruby2_5 | 6 |
| 14 | rubocop-ruby3_0 | 6 |
| 15 | rubocop-ruby2_2 | 6 |
| 16 | rubocop-ruby2_0 | 6 |
| 17 | rubocop-ruby3_1 | 6 |
| 18 | rubocop-ruby1_9 | 6 |
| 19 | rubocop-ruby2_7 | 6 |
| 20 | rubocop-ruby2_4 | 6 |
| 21 | rubocop-ruby2_6 | 6 |
| 22 | B4U | 5 |
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