CodeRabbit

CodeRabbit is an AI-powered code review bot that integrates directly with GitHub and GitLab. When a pull request is opened, CodeRabbit automatically analyzes the changes and posts review comments identifying bugs, security issues, performance problems, and style inconsistencies. The reviews are surprisingly detailed — it understands context from the broader codebase, not just the diff. It can enforce custom coding standards, suggest refactoring opportunities, and even explain complex changes for reviewers. The bot responds to comments, so you can ask it follow-up questions about its suggestions. CodeRabbit is free for open-source projects, which has driven strong adoption. For private repositories, the paid plans offer unlimited reviews. It works best as a first-pass reviewer that catches obvious issues before human reviewers spend time. The quality of suggestions is good enough that many teams report catching bugs that would have made it to production.