Choosing an AI code review tool

• Pull requests arrive faster than reviewers can read them.
• Coding agents now open a growing share of your pull requests.
• You want written review standards applied the same way on every change.

1. Tuning

   Can you tell it what to flag and what to skip?

   Look forRules scoped by path: CodeRabbit path instructions in .coderabbit.yaml, Greptile strictness on a 1 to 3 scale with ignore patterns, and Copilot instruction files, including path-specific ones.

2. Learning

   Does it learn from how your reviewers respond?

   Look forCodeRabbit turns replies in review chat into Learnings, with an optional window of up to 30 days for admins to approve each one. Greptile learns from reactions and replies, and its documentation says it stops repeating ignored comments after 2 to 3 weeks.

3. Context

   Does it read beyond the diff?

   Look forGreptile reviews each pull request against a graph of the whole repository. CodeRabbit keeps a searchable index of the code so reviews can draw on files outside the diff.

4. Data

   What does it store, and does it train on your code?

   Look forCodeRabbit stores encrypted code and dependency caches, a code index, and Learnings. It does not train on private repositories, and its privacy policy reserves the right to train on open-source repositories. Greptile Cloud keeps code cached until access is revoked, and its security page reserves the right to train on de-identified data until you opt out.

5. Cost

   How does spend grow with review volume?

   Look forCodeRabbit includes 5 to 12 PR reviews per developer per hour by plan, then bills US$0.25 per reviewed file as pay-as-you-go usage, with no spending cap until an admin sets one. Greptile Pro has no seat fee and bills prepaid credits at US$1 each, with a Base review at 1 credit and Apex at 10. Copilot code review draws AI credits, which GitHub estimates at US$0.05 to US$1 per review on Lite effort.

1. 1Which paths can we exclude, and where in the repository do review rules live?
2. 2What does the reviewer keep after a review, and how do we turn retention off?
3. 3Does the vendor train on any of our code, including public or open-source repositories?
4. 4Past the included reviews, does review pause or bill, and under what cap?
5. 5Can the reviewer approve a pull request, and who decides whether that is on?

• No way to scope or silence rules by path.
• Storage claims on a marketing page that the documentation does not match.
• Auto-approval switched on before the team has measured which comments lead to changes.
• Comment counts offered as the measure of value.

Listed in no particular order.

• CodeRabbit+16 MixedAI Code Review by CodeRabbitAdd to My Stack
• Greptile+40 PositiveAI Code Review by GreptileAdd to My Stack
• GitHub Copilot+15 MixedAI Coding Agent by GitHubAdd to My Stack

Official documentation

13

1. 1CodeRabbit docs: Path-based review instructionsOfficial documentationdocs.coderabbit.ai
2. 2CodeRabbit docs: LearningsOfficial documentationdocs.coderabbit.ai
3. 3CodeRabbit docs: FAQ (data security)Official documentationdocs.coderabbit.ai
4. 4CodeRabbit Privacy Policy (updated October 16, 2026)Official documentationcoderabbit.ai
5. 5CodeRabbit docs: Plans and pricingOfficial documentationdocs.coderabbit.ai
6. 6CodeRabbit docs: Usage-based reviewsOfficial documentationdocs.coderabbit.ai
7. 7Greptile docs: Controlling nitpickinessOfficial documentationgreptile.com
8. 8Greptile docs: Memory and learningOfficial documentationgreptile.com
9. 9Greptile docs: Graph-based codebase contextOfficial documentationgreptile.com
10. 10Greptile security practicesOfficial documentationgreptile.com
11. 11Greptile pricingOfficial documentationgreptile.com
12. 12GitHub Docs: About Copilot code reviewOfficial documentationdocs.github.com
13. 13GitHub Docs: Repository custom instructionsOfficial documentationdocs.github.com