It depends on headcount and PR volume. Ten people opening 100 PRs a month are cheaper on Greptile, which does not charge per seat. Three people opening 300 are cheaper on per-seat CodeRabbit. Count your PRs before comparing.

Can we stay on free tiers?

CodeRabbit is free on public repositories. Greptile's free tier gives 50 credits a month for one developer, and Graphite is free for individual use. Open-source maintainers and solo developers can often run at no cost.

Can we drop human review?

No. Conformance to the specification and soundness of the design are human judgements. What the AI reliably catches is type mismatches, missing error handling and inconsistent naming.

Why does adoption fail?

One of two ways: too many comments and PRs stall, or the comments get ignored and bury the human ones. Making comments advisory for the first two weeks, then disabling the categories that proved useless, fixes both.

Ranking

AI code review tools in 2026

Tools that read a pull request and write comments on it. They do not replace human review — their job is to clear the mechanically detectable problems first so reviewers can spend their attention on design.

Published 2026-11-01 · updated 2026-11-01

How we ranked these

Stated before the list, so you can disagree with the weighting rather than the result.

CriterionWeightWhy it matters

Billing unitHighPer-seat and per-credit pricing invert with team size and PR volume

Free usageHighSolo developers and open source can often run entirely on free tiers

Whole-codebase contextHighWhether it reads only the diff or checks consistency across files

TunabilityHighWithout the ability to disable categories, it becomes a thread nobody reads

Self-hosting and customer environmentsMediumRequired where source cannot be sent to a third party

Fit with existing workflowMediumGitHub, Slack and issue tracker integration

The ranking

01
CodeRabbit4.5$24/mo
An AI reviewer that reads the pull request and writes the summary and the comments. Free on public repos.
Easy to justify for teams with review bottlenecks. Try it on a public repo first and tune the noise.
Read the full review →Try CodeRabbit on the official site
02
Greptile4.3Free
Reviews against the context of the whole codebase, and bills by credits rather than per seat.
The better choice on large or legacy codebases where context outside the diff is what matters.
Read the full review →Try Greptile on the official site
03
Graphite4.4$20/mo
Tooling for stacked pull requests, with AI review and a merge queue attached.
Worth it for teams with a large-PR problem and the appetite to change workflow. Otherwise skip.
Read the full review →Try Graphite on the official site

Questions we get

Which is cheapest?: It depends on headcount and PR volume. Ten people opening 100 PRs a month are cheaper on Greptile, which does not charge per seat. Three people opening 300 are cheaper on per-seat CodeRabbit. Count your PRs before comparing.
Can we stay on free tiers?: CodeRabbit is free on public repositories. Greptile's free tier gives 50 credits a month for one developer, and Graphite is free for individual use. Open-source maintainers and solo developers can often run at no cost.
Can we drop human review?: No. Conformance to the specification and soundness of the design are human judgements. What the AI reliably catches is type mismatches, missing error handling and inconsistent naming.
Why does adoption fail?: One of two ways: too many comments and PRs stall, or the comments get ignored and bury the human ones. Making comments advisory for the first two weeks, then disabling the categories that proved useless, fixes both.

Other rankings

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trophyHow we ranked these

trophyThe ranking

CodeRabbit4.5$24/mo

Greptile4.3Free

Graphite4.4$20/mo

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Questions we get