Foundation Machines vs CodeRabbit.
Both review pull requests with AI. CodeRabbit is general-purpose code quality. Foundation Machines is security-focused with proof-of-concept fix PRs.
CodeRabbit and Sebastion AI are both AI GitHub Apps that comment on pull requests. CodeRabbit covers general code quality across most languages. Sebastion AI is security-only, we look for exploitable vulnerabilities (injection, hardcoded secrets, broken auth, supply-chain risks, insecure crypto) and file findings as a structured GitHub issue with concrete fixes. Most teams run both.
Visit CodeRabbit to evaluate them directly. We try to keep this comparison accurate; let us know if anything is wrong.
What you get from each.
Choose CodeRabbit when
You want one AI reviewer commenting on every PR across a broad polyglot codebase, with style, refactor and quality suggestions alongside light security checks. CodeRabbit has a more general scope and can replace several lint/review chores at once.
Choose Sebastion AI when
You want a reviewer that takes security seriously, applies stack-aware vulnerability checklists, flags real exploitable bugs and posts findings as inline review comments with concrete fixes. Free for public repos, $19/dev/mo for private. Designed to run alongside CodeRabbit, not replace it.
Try Foundation Machines on your next PR.
Free for solo developers and OSS maintainers. Install the GitHub App and review your next pull request in under a minute.