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AI code review
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Perch lets code owners write custom rules like “never log passwords,” applied to every pull request.

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20¢ a pull request · $5 free credit · No card needed

Works withClaude CodeCodexCursorPiGitHub
/How it works

  1. Maps your code

    Perch parses the repo with tree-sitter and maps each method’s callers and callees.

  2. Checks each change

    Perch runs your rules and its bug and security scans on every changed method.

  3. Comments on the PR

    Perch fails the check and comments on the code it flags.

Turn on pull request scans
/Pricing

About 20¢ a pull request

  1. Perch~20¢/ PR10¢/1,000 checks, cached free
  2. Macroscope~$0.95/ PR$0.05/KB of diff, $0.50 min5×
  3. Greptile~$1/ PR$1/credit, no seat fees5×
  4. CodeRabbit$1–3/ PR$24–60/dev/mo5–15×
  5. Claude Code Review$15–25/ PRBilled by tokens75–125×
  • 10¢ per 1,000 rule checks
  • Cached checks are free
  • Your first $5 of usage is free
Start nowCompare Perch with each tool

A typical pull request: about 60 methods read. Published pricing estimates. Greptile rechecked October 23, 2026; other rates retain their September sources. Seat-based plans assume 20 PRs per dev per month.

/Real issues

Bugs Perch found in open source.

  1. pydata/xarrayPython

    diff raises RecursionError when n is around 1000 or more

    #11702Fixed

  2. kubernetes-client/pythonPython

    parse_quantity raises decimal.Overflow instead of ValueError for some large quantities

    #2735Fixed

  3. symfony/symfonyPHP

    [Yaml] PARSE_OBJECT_FOR_MAP throws \Error on a key starting with a NUL byte

    #66829Fixed

Real issues
/FAQ

Questions

How is Perch billed?

10¢ per 1,000 rule checks, about 20¢ for a typical pull request. Answers are cached, so unchanged code is free and gets the same result every run. Your first $5 is free, and you don’t need a card to start.

What does Perch check if I haven’t written any rules?

Every changed method, for defects and security issues: off-by-one loops, unchecked empty values, weak hashing, and missing authorization. Your rules in perch.yaml run alongside.

Which languages does it support?

Python, TypeScript, JavaScript, Go, Rust, Java, Kotlin, C, C++, C#, Swift, Ruby, PHP, and six more.

Do you train on my code?

No. Findings are deleted 30 days after each scan, and the privacy policy says where code goes.

Does it work with GitLab?

Perch Cloud reviews GitHub pull requests. The open-source CLI also runs in GitLab CI.

Check your agent’s next change.

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