AI Code Review Tools Ranked by Public Pull Requests Reviewed

Summary

The AI Code Review Bot Index compares 56 AI pull-request review tools using vendor-page data on pricing, supported platforms, self-hosting, and licensing. For 26 tools whose GitHub bot identities were verified, it also reports the number of public GitHub pull requests formally reviewed during week 2026-W39, covering PRs created from September 21 to 27 and measured on October 7, 2026. GitHub Copilot code review ranked first with 146,488 public PRs reviewed, followed by OpenAI Codex code review with 115,760 and CodeRabbit with 81,094. The table also reports PRs commented, which can differ substantially from PRs reviewed; for example, Codex recorded 236,636 comments and CodeRabbit 291,815. The index includes tools across GitHub, GitLab, Bitbucket, and Azure DevOps, with entries ranging from free or open-source options to paid plans and enterprise-only offerings. Tools without attributable or verified bot identities remain listed by name but receive no activity number. The publisher stresses that the figures measure public activity only, are not market share, quality, private usage, or unique-user counts, and that one pull request may be reviewed by multiple bots. Each number links to a reproducible query, and the data is refreshed weekly.