AI PR Review Tools - CodeRabbit vs Greptile vs Graphite

Path: Computer Tech/Development/AI PR Review Tools - CodeRabbit vs Greptile vs Graphite.mdUpdated: 2/3/2026

AI PR Review Tools - CodeRabbit vs Greptile vs Graphite

Automated AI code review tools that integrate directly into GitHub/GitLab pull requests. These bots analyze your PRs, leave inline comments, catch bugs, and suggest improvements before human reviewers even look at the code.

What These Tools Do

Unlike AI coding assistants (Copilot, Cursor, OpenCode) that help you write code, PR review tools analyze code after you've written it:

Automatic triggering - Bot activates when you open a PR
Inline comments - Points to specific lines with issues
Full codebase context - Understands your entire repo, not just the diff
Bug detection - Security vulnerabilities, logic errors, edge cases
Style enforcement - Consistency with your codebase patterns

The Three Major Players

CodeRabbit

Best for: Most teams, especially open source projects

Aspect	Details
Pricing	Free for public repos, $15/user/month for private
Bug detection	44% catch rate (benchmark)
Strengths	Low noise, adaptive learning, good signal-to-noise ratio
Weaknesses	Lower bug detection than Greptile
Platforms	GitHub, GitLab

CodeRabbit learns from your feedback over time. If you dismiss a suggestion, it adjusts future reviews. Most popular option with strongest community adoption.

Greptile

Best for: Teams prioritizing maximum bug detection

Aspect	Details
Pricing	~$30/user/month (more expensive)
Bug detection	82% catch rate (benchmark) - highest in class
Strengths	Full repo graph analysis, self-hosting option, API access
Weaknesses	More noise/false positives, higher cost, some trust concerns
Platforms	GitHub

Greptile's deep codebase indexing catches bugs other tools miss. Trade-off is more comments to review, some of which may be low-value.

Graphite Diamond

Best for: Teams already using Graphite for stacked PRs

Aspect	Details
Pricing	Part of Graphite platform ($20/user/month)
Bug detection	6% catch rate (benchmark) - lowest
Strengths	Integrated with Graphite workflow, stacked PR support
Weaknesses	Poor standalone performance, requires Graphite ecosystem
Platforms	GitHub

Diamond is best viewed as a feature of Graphite's stacked PR workflow, not a standalone review tool. Don't choose it for code review alone.

Head-to-Head Comparison

Feature	CodeRabbit	Greptile	Graphite Diamond
Bug catch rate	44%	82%	6%
False positive rate	Low	Higher	Low
Codebase context	PR + related files	Full repo graph	PR-focused
Self-hosting	No	Yes	No
API access	Limited	Yes	No
Learning/adaptive	Yes	Limited	Yes
Free tier	Public repos	No	No
Setup complexity	Easy	Medium	Easy (if using Graphite)

Benchmark Context

The 82% vs 44% numbers come from Greptile's own benchmark testing 50 real-world bugs. Take with appropriate skepticism - Greptile ran the test. However, independent reviews generally confirm Greptile catches more issues but with more noise.

Which Should You Choose?

Start here:
    │
    ├── Budget-conscious or open source?
    │   └── CodeRabbit (free for public repos)
    │
    ├── Maximum bug detection is priority?
    │   └── Greptile (highest catch rate)
    │
    ├── Already using Graphite for stacked PRs?
    │   └── Graphite Diamond (integrated experience)
    │
    └── Want lowest noise, good-enough detection?
        └── CodeRabbit (best signal-to-noise)

For Solo Developers

If you're working alone on personal projects:

CodeRabbit is the obvious choice - free for public repos
Even for private repos, $15/month catches bugs before they ship
These tools shine most on team projects but still valuable solo

What They Won't Replace

These tools augment, not replace:

Human code review - Still needed for architecture, design decisions
Linters/formatters - ESLint, Prettier still handle style
Type checking - TypeScript compiler catches type errors faster
Tests - Unit/integration tests catch runtime issues

Think of AI PR review as another layer in your quality stack.

AI PR Review Tools - CodeRabbit vs Greptile vs Graphite

AI PR Review Tools - CodeRabbit vs Greptile vs Graphite

What These Tools Do

The Three Major Players

CodeRabbit

Greptile

Graphite Diamond

Head-to-Head Comparison

Benchmark Context

Which Should You Choose?

For Solo Developers

What They Won't Replace

Links

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