Graphite Diamond vs Amazon Q Developer
Side-by-side from the Top 11 ranking of CodeRabbit vs Copilot vs Greptile: 11 Best AI Code Review Tools 2026. Last verified July 24, 2026.
The short answer
Graphite Diamond ranks higher on Top 11 (#5 vs #7) for Engineering leads and platform teams adding an AI reviewer to their pull request workflow. Fewest comments, highest hit rate per comment.
At a glance
| Graphite Diamond | Amazon Q Developer | |
|---|---|---|
| Top 11 rank | #5 / CodeRabbit vs Copilot vs Greptile: 11 Best AI Code Review Tools 2026 | #7 / CodeRabbit vs Copilot vs Greptile: 11 Best AI Code Review Tools 2026 |
| Score (out of 9.4) | 8.4 | 8 |
| Best for | Stacked PR workflows | AWS shops under existing contracts |
| Pricing | $$ ($20 to $30 per developer/mo) | $ ($0 to $19 per user/mo) |
| HQ | San Francisco, USA | Seattle, USA |
| Founded | 2020 | 2006 |
Graphite Diamond
Fewest comments, highest hit rate per comment.
graphite.dev/diamondSee full entry in CodeRabbit vs Copilot vs Greptile: 11 Best AI Code Review Tools 2026
Amazon Q Developer
Cheapest credible option if you already run AWS.
aws.amazon.com/q/developer/See full entry in CodeRabbit vs Copilot vs Greptile: 11 Best AI Code Review Tools 2026
Methodology and scoring weights live at /methodology. No vendor pays for placement — see about.