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Where arnx fits next to other review tools.

Most of these tools review the pull request. arnx tests the change before it.

arnx is an open-source CLI that writes and runs tests for a finished change on your own machine. Pull request reviewers comment on the diff for a whole team. These are different jobs, and each page below says when the other tool is the better choice and how the two fit together.

Every statement about another product links to that product's own documentation and carries the date we read it. Where we could not find something in their documentation, we say that, and do not say the product lacks it.

• arnx vs CodeRabbit

  CodeRabbit reviews pull requests across a team in any language. arnx runs before the pull request and backs each finding with a test it executed. Many teams can use both.

• arnx vs Greptile

  Greptile reviews every pull request with a graph of the whole codebase. arnx runs before the pull request and backs each finding with a unit-level test it executed.

• arnx vs Claude Code's native review

  Claude Code's own review reads the change and reports findings in the same tool that wrote it. arnx is a separate tool that proves suspected bugs with tests it runs.

New to the topic? Start with the guide to AI code review, or see findings from real repositories.