AI Code Review Tools Compared: What Each One Actually Does (2026)

AI code review tools read your pull requests and post comments before a human does. The category has consolidated around a handful of products with genuinely different shapes: CodeRabbit and Greptile sell per-seat review agents, Graphite bolts review AI onto a stacking workflow, Qodo focuses on test generation and merge policies, and SuperDiffs, which we make, tunes for precision and publishes its own measured error rates. This comparison lays out what each tool does, what it costs at today's listed prices, and the one question most vendors avoid: how often the reviewer is wrong.

Disclosure up front: we build SuperDiffs, one of the tools in this comparison. Every competitor fact below comes from the vendor's own site, checked this week. Where we lack data, we say so plainly, because that is the honest way to run a comparison. Two companion pieces go deeper: CodeRabbit alternatives for switchers, and our AI code review benchmark results for how we measure the accuracy claims.

What AI code review tools have in common

All of them connect to GitHub (most also support GitLab), watch for opened or updated pull requests, and generate line-level comments from a large language model. All of them can summarize a diff, flag obvious bugs like a missing await or an unvalidated input, and answer questions about the change. The differences show up in three places: how much context they read, what they cost as your team grows, and whether the vendor tells you anything about accuracy.

Context first. Greptile indexes your whole repository so its comments can reference code far from the diff. CodeRabbit emphasizes diff-level annotation and PR walkthroughs. Qodo built its agent around test writing and merge queue policies. Graphite's reviewer ships inside a stacked-PR workflow tool. SuperDiffs reads the diff plus targeted surrounding context and spends its effort on verification: every candidate finding goes through a second pass that re-reads the diff before anything is posted. Precision over volume is the whole design goal.

AI code review tools compared: the table

Prices are each vendor's live listed prices as of late August 2026, per their pricing pages, billed annually where the vendor discounts for it.

Read the last column carefully, because it is the one nobody else fills in. Vendors publish feature lists and customer logos; none of the four competitors above publishes a measured false-positive rate for their reviewer. That absence is why our own benchmark page exists: we would rather show a mediocre number we measured than a great number we invented.

How each tool works in practice

CodeRabbit

CodeRabbit is the most visible name in the category and the default comparison point. Pro at $24 per user per month gets agentic reviews on PRs and a CLI. The $48 tier adds multi-repo analytics. The review style is thorough: expect a walkthrough summary plus line comments on most nontrivial diffs. Teams that want lots of signal like it; teams with low comment tolerance find it noisy and spend time configuring it down. Its pricing page is the source for the numbers here.

Greptile

Greptile's differentiator is full-codebase context: it indexes your repositories, so a review can cite the function three directories away that the diff silently changes behavior for. Pro is $30 per seat per month with 50 credits included, where one credit buys a standard review and three buy a "TREX" deep review; extra credits are $1 each. If your pain is reviews that miss cross-file effects, this is the tool to shortlist. Details on their pricing page.

Graphite

Graphite is a stacking workflow (stacked PRs, inbox, CLI) that grew an AI reviewer. Hobby is free for personal repos; Starter is $20 per user per month; the $40 Pro tier is marketed as unlimited AI reviews. The reviewer is tied to the workflow: if your team already lives in Graphite, the AI is a natural add. If you only want a reviewer and not a new git workflow, it is a lot of tool around the part you asked for. Source: Graphite pricing.

Qodo

Qodo (formerly CodiumAI) approaches review from the testing side: generated tests, merge confidence scores, and policy enforcement in the merge queue. Its pricing moved to pooled credit packs in 2026, $0.012 per credit across the team, with the Pro Team plan at $30 a month including a credit allowance (roughly 18 reviews a month at the entry pack) and unlimited-credit options above it. Teams that want review tied to test coverage rather than diff annotation rate prefer it. Source: qodo.ai/pricing.

SuperDiffs

We save ourselves for last and apply the same honesty to our own row. SuperDiffs posts only findings that survived a second verification pass, at a review depth you pick per repo (quiet, balanced, thorough, with thorough as a paid depth). Free is $0 forever per organization with a real review budget; Team is $19 per seat per month with $60 of monthly inference included and reviews that pause rather than bill by surprise. Drive-by PR authors are never counted as seats. Our published benchmark is a seeded-bug run over 25 fixture PRs: 80.0% of seeded bugs found, 66.7% precision, with the five missed bugs listed by name. That is not a great precision number. It is a real one, and the page explains exactly how it was measured so you can discount it appropriately.

The question to ask any vendor

Before you commit to any of these, ask one question: what fraction of the comments your reviewer posts are wrong, and how do you know? Every vendor will show you a demo where the AI catches a real bug. None of the per-seat vendors above publishes an answer. We think that is the number that decides whether an AI reviewer saves your team time or quietly taxes it with false positives, which is why we publish ours, methodology and misses included, and invite independent verification.

Frequently asked questions

Which AI code review tool is cheapest for a small team?

For open-source repositories, SuperDiffs and CodeRabbit are both free indefinitely. For private repos, SuperDiffs Team starts at $19 per seat per month, Graphite Starter at $20 per user, CodeRabbit Pro at $24, Greptile Pro at $30 per seat, and Qodo's Pro Team at $30 per month with pooled credits. Prices are the vendors' listed rates as of late August 2026.

Do AI code reviewers replace human review?

No tool in this comparison claims to, and you should distrust any that does. The realistic value is catching mechanical bugs before a human looks, summarizing large diffs, and answering "what does this change" questions on demand. Judgment about architecture and tradeoffs stays with people.

What does SuperDiffs cost?

Free is $0 forever per organization. Team is $19 per seat per month billed annually ($24 monthly), and drive-by contributors are never counted as seats. The full plan matrix is on our pricing page.

How is this comparison kept honest?

Every price was pulled from the vendor's own pricing page this week and linked. Where a vendor publishes no accuracy data, the table says so instead of guessing. We make one of the tools compared, and our own numbers are the measured kind, published with methodology on the benchmark page.