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Best Code Review Tools 2026: GitHub, GitLab, Graphite, Reviewable Compared

Code review is where quality happens — or doesn't. The right review tools make the difference between reviews that catch bugs and reviews that are just rubber stamps. Here's how GitHub, GitLab, Graphite, Reviewable, and others compare for real review workflows.

Quick Comparison

GitHub PRs GitLab MRs Graphite Reviewable Gerrit

Best for Most teams (default) GitLab users Stacked PRs, fast-moving teams Thorough, async reviews

Stacked diffs No (sequential PRs) No Yes (core feature) Yes (partial)

AI review Copilot PR review GitLab Duo In preview No

Inline suggestions Yes (commit suggestion) Yes Yes Excellent

Review state tracking Basic (requested, reviewed) Good (approval rules) Good Excellent (per-file tracking)

GitHub PR Reviews — The Default for Most Teams

GitHub's pull request…