Open-source alternatives to CodeRabbit

The highest-scoring open-source projects in Code review and testing. They are picks, not exact replacements, so read the weaknesses before you switch.

Open-source alternatives to CodeRabbit
RankProjectScore
1open-code-reviewCLI that reviews Git diffs with an LLM agent and line-level commentsCode review and testing, 45.8k stars, Apache-2.073 out of 100

Reviews

173 out of 100

open-code-review

CLI that reviews Git diffs with an LLM agent and line-level comments

45.8k stars, Apache-2.0, last commit Oct 2026

Open Code Review is a Go CLI (`ocr`) that reads a Git diff, groups related files into bundles, and runs each bundle through a tool-using LLM agent that produces structured review comments. File selection, rule matching, comment positioning and reflection are done by deterministic code rather than prompts. `ocr scan` reviews whole files when there is no diff, and delegation mode lets an existing coding agent do the review with its own model.

Strengths

  • Deterministic file selection and bundling; each bundle runs as an isolated sub-agent
  • Reviews workspace changes, branch ranges, single commits, or full files via `ocr scan`
  • Sessions can be resumed and browsed in a viewer; JSON output for automation
  • Plugins for Claude Code, Codex, Cursor, Kimi Code, OpenCode; CI docs for GitHub, GitLab, Gerrit

Weaknesses

  • Requires Git >= 2.41 and a configured LLM endpoint, unless delegation mode is used
  • Recall is lower than general-purpose agents by the README's own benchmark
  • Benchmark figures are published by the project itself, not independently verified
  • No Docker or Compose files detected
  • no GPU
  • Needs Git >= 2.41, LLM provider API
  • Models: configurable LLM providers, custom providers