Mergehound vs CodeRabbit.
Most AI code reviewers fire on the PR. Mergehound watches every push — OWASP checks, style enforcement, and baseline regressions run continuously, then a single end-of-day Slack digest lands in the channel you pick. The side-by-side below goes row by row.
Six dimensions, no hedging.
Review coverage model, OWASP / SAST scans, Slack digest, GitHub App install scope, pricing, and data handling. The Mergehound column is what we ship; the CodeRabbit column reflects their public product surface — confirm specifics on their site before you choose.
| Dimension | Mergehound | CodeRabbit |
|---|---|---|
| Review coverage model | Always-on — watches every push. OWASP checks, style enforcement, and baseline regressions run continuously on every diff, not just on PR open. | Per-PR — fires when a pull request is opened or updated. No coverage between commits. |
| OWASP / SAST scans | OWASP ASVS-aligned with CWE-tagged inline comments on every diff. Security regressions surface as soon as they land, not after the next PR. | General AI review focused on style, correctness, and suggestions. Bundled SAST coverage is not the headline. |
| Slack digest | One daily end-of-day rollup to the channel you pick — new regressions, merge-blockers, and stalled PRs in a single thread so standup has the headline. | Per-PR notifications as they happen. No scheduled rollup; channel volume scales 1:1 with PR count. |
| GitHub App install scope | Read PRs + write inline issue comments. Never opens, closes, merges, or rebases anything on its own — the App cannot act on the repo outside its own comment thread. | Standard GitHub App install with a comparable minimum scope; review-posting is the primary write path. |
| Pricing | Per repository, per month. Public repos free forever. Pro from $19 / repo / month — a 2-engineer OSS maintainer pays the same as a 50-engineer team. | Per-seat pricing. Cost scales with headcount rather than with repos or coverage, which gets expensive as teams grow. |
| Data handling | Diff is processed once for the review and then dropped; nothing trains on your code. SOC2-friendly audit log export on Pro and Enterprise — see exactly what was read and when. | Code is processed for review; training-on-your-code policy varies by plan and is worth confirming before install on a private repo. |
Why teams pick always-on over per-PR.
A reviewer that fires once, on PR open, has to make every observation at the moment a teammate is least likely to act. A reviewer that runs on every push gets to surface what changed before the next PR even exists.
Bad merges do not reach standup.
Continuous coverage means a regression lands a CWE-tagged comment before the PR is even opened, not after a teammate has merged it.
One digest, not a flood of pings.
A single end-of-day Slack rollup beats per-PR notifications once your team is past a handful of branches.
Pricing does not punish the org chart.
Per-repo pricing lets a small open-source maintainer and a 50-engineer platform team land on the same product path.
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