There are more AI reviewers for GitHub now than most teams have time to trial. This page sorts the main ones by what they actually do on a pull request, says what each is good at, and is honest about where Firetrail fits. We build one of these tools, so read the recommendations with that in mind. Prices and features were checked on the vendors' own pages on September 4, 2026, and every claim links to where we read it.
updated September 4, 2026 · every fact links to where we checked it
Most “best AI code review tool” lists compare one job: finding defects in the changed lines and posting comments next to them. That is the job CodeRabbit, Greptile, Copilot, Bugbot and Anthropic's Claude Code Review compete on, and they are genuinely good at it. If that is what you need, the rest of this page mostly tells you which one fits your stack.
There are two other jobs. The second is judging the change as a unit: is this one deliverable or four, does the diff match what the description claims, is the risky part tested, and how will this feel to maintain in six months. No inline comment answers that, and a PR can pass a line review cleanly and still be expensive. The third is helping a human understand a large diff before approving it, which matters more every month as agents write bigger PRs.
Firetrail does the second job and, through the Review Brief, the third. It does not do the first: there are no inline comments, and we don't plan to add them while the other tools do it well. So the honest framing is not “Firetrail versus CodeRabbit” but “which tool for which job”.
Facts as stated on each vendor's site on September 4, 2026. Links to the pages we read are at the bottom.
| Tool | What it does on the PR | What it reads | Pricing (checked Sep 2026) | Best for |
|---|---|---|---|---|
| CodeRabbit | A walkthrough comment at the top (summary, sequence diagrams, review effort), line-by-line comments grouped by category and severity, one-click fixes, incremental re-reviews on every push, and “learnings” from your replies. Runs 50+ open-source linters and security scanners as part of the review. | The diff plus repository context and linter output | Essentials $24 per developer per month billed annually ($30 monthly), Team $48 annual ($60 monthly), Advanced $72 annual-only, Enterprise custom. Free for public open-source repositories; 14-day trial. | Teams that want the most complete inline reviewer, with GitHub, GitLab, Azure DevOps and Bitbucket support and Jira/Linear integrations. |
| Greptile | Indexes the whole repository as a graph, then parallel agents post inline comments with suggested fixes about three minutes after the PR opens. “Fix with your agent” hands a comment to Claude Code, Cursor, Codex or Devin. Learns from 👍/👎 and replies; custom rules in plain English. | The diff plus a graph of the entire repository | Starter is free with 50 review credits a month for one developer; Pro is $30 per seat per month with 50 credits per seat and $1 per extra credit (a standard review is one credit, a TREX test-writing run is three); Enterprise is custom with self-hosting and SSO. | Teams whose bugs are cross-file and who want comments that reference code the diff didn't touch. GitHub and GitLab. |
| GitHub Copilot code review | Native to github.com: request Copilot as a reviewer (or auto-request it with rulesets) and it posts inline comments and a summary like any other reviewer. | The diff plus repository context | Included with paid GitHub Copilot plans (Pro $10, Pro+ $39, Business $19 per user, Enterprise $39 per user); reviews draw from the plan's AI credits. | Teams already paying for Copilot who want zero extra vendors and zero setup. |
| Cursor Bugbot | Reviews PRs on GitHub, comments on potential issues, and offers to fix them in the Cursor editor or through a Background Agent. Positioned as a pre-merge check. | The diff plus repository context | Sold with Cursor's plans; 14-day free trial on all plans. Check Cursor's pricing page for the current per-review terms. | Teams writing in Cursor who want the fix to land in the same editor the code came from. |
| Claude Code Review (Anthropic) | A managed service: several agents analyze the diff in parallel, a verification step checks each candidate against actual code behavior to cut false positives, and findings post as inline comments tagged Important, Nit or Pre-existing. The check run is always neutral. Tuned with a REVIEW.md. | The diff in the context of the full codebase | Research preview for Claude Team and Enterprise subscriptions; billed by token usage, $15–25 per review on average, separately from the plan's included usage. | Teams on Claude Team or Enterprise who want a low-noise correctness pass and accept a higher per-review cost. |
| Graphite (Graphite Agent, formerly Diamond) | AI review inside Graphite's stacked-PR workflow, next to its merge queue and review UI. | The diff plus repository context | Hobby is free (personal repos, limited AI reviews); Starter $20 per user per month; Team $40 per user per month with unlimited AI reviews; Enterprise custom. Annual billing. | Teams that already stack PRs and want review and merging in one tool. |
| Qodo Merge (ex PR-Agent) | Agentic PR review with a rules system, across GitHub, GitLab, Bitbucket and Azure DevOps. The open-source PR-Agent runs the core review on your own keys. | The diff plus repository context | A 14-day trial, then a credit-based team plan (pooled credits, monthly billing) and custom Enterprise pricing; the open-source PR-Agent can be self-hosted with your own model keys. | Teams that need to self-host, or to run reviews on their own model provider. |
| Firetrail | One comment per PR, updated in place, plus a neutral check. Inside it: a Future Debug Cost score with an itemized breakdown, yes/meh/no verdicts from up to ten reviewers with different specialties, intent drift (what the PR did that the description never said), a patch-coverage estimate, and a link to the full analysis. On a bugfix, origin tracing finds the past PRs that introduced the lines and how they scored at the time. Review Brief, Security Audit and Rework plans come through the Firetrail MCP in your own coding agent. | Only the PR's diff, title and description, plus Firetrail's own history of your analyzed PRs. Never the repository. See what we send. | Free for one repository and 50 PRs a month. Starter $24, Pro $39 and Business $49 per active developer per month (about two months off billed yearly), each with 50 analyzed PRs per seat per month, then $1 per PR ($0.75 on Business). Pushes and re-runs of an already-counted PR are free. | Teams shipping a lot of agent-written code who need to judge size, intent and risk, not only lines. GitHub only. |
Prices move. If a number here disagrees with a vendor's page, the vendor's page is right and we'd like to know: [email protected].
Every tool on this page runs on GitHub. Copilot is built into it. CodeRabbit, Greptile, Bugbot, Claude Code Review and Firetrail install as GitHub Apps and act when a pull request opens or gets pushed to. The difference is what “reviewer” means to each of them.
For the bots, a reviewer is an account that leaves inline comments and, in some cases, a review approval or request-changes. For Firetrail, a reviewer is one of ten named personas (backend, frontend, security, database, accessibility, software design, plus SRE, QA, privacy and performance) who each read the whole change and land on a verdict with findings. The verdicts live in one comment and in the app; they never approve, request changes, or block. If you want a bot that can block merges out of the box, that is not Firetrail. Firetrail's Merge Checks exist, but they are opt-in, bound to facts rather than the score, and start in a simulation mode that can't block anything.
Setup is the same shape everywhere: install the app, pick repositories, open a PR. Firetrail's quick start takes a few minutes and the Free plan covers one repository and 50 PRs a month, so you can watch what it posts on a low-stakes repo before deciding anything.
Our honest read, including the cases where the answer is not us.
if…
You want bugs flagged on the lines, starting today, and you're on GitHub.
CodeRabbit or Greptile. Copilot code review if you already pay for Copilot and want no extra vendor.
if…
You're on GitLab, Bitbucket or Azure DevOps.
CodeRabbit or Qodo Merge. Greptile covers GitLab. Firetrail doesn't apply.
if…
Your organization is on Claude Team or Enterprise and false positives are your main complaint.
Try Claude Code Review; its verification step exists precisely to cut noise. Budget for the per-review cost.
if…
Half or more of your PRs come from Claude Code, Cursor, Codex or Copilot agents.
Firetrail, next to one line-comment bot. Agent PRs fail on size, bundled intents and confident tests more than on line-level bugs. See reviewing AI-generated code.
if…
You need to understand a 3,000-line PR before you approve it.
Firetrail's Review Brief (every plan, through your coding agent) puts endpoints, schema diff, intent drift, findings and wireframes on one page. CodeRabbit's walkthrough and Change Stack are the inline-bot equivalent.
if…
You must self-host or keep inference on your own provider.
Qodo's open-source PR-Agent, or Greptile Enterprise. Firetrail is hosted only.
if…
You want to know whether risk warnings actually predicted your bugs.
Firetrail's origin tracing (Business) works backwards from each bugfix to the PRs that caused it and shows how they scored. We don't know of another tool that closes that loop.
It depends on the job. For inline bug finding on GitHub, CodeRabbit and Greptile are the most complete, Copilot is the cheapest if you already pay for it, and Claude Code Review is the lowest-noise option if your organization is on Claude Team or Enterprise. For judging whether a change is too big, too mixed, undisclosed or untested, and for learning which past PRs caused your bugs, Firetrail is the tool built for that, and it runs beside any of the others.
No. They comment on the lines; Firetrail judges the change. Most teams that use Firetrail keep a review bot, and Firetrail posts one comment per PR, updated in place, so it doesn't add to the thread. See the side-by-side pages for CodeRabbit and Greptile.
All of the tools on this page run on GitHub, and Copilot code review is part of GitHub itself. Firetrail installs as a GitHub App, posts a neutral check and one comment per PR, and never needs write access to your code. If you need GitLab or Bitbucket, look at CodeRabbit, Greptile or Qodo instead.
Policies differ by vendor, so read each one's data page. Firetrail sends only the PR's diff, title and description to commercial model APIs where customer data is not used for training, and trains nothing on your code itself. The full breakdown is on the security page.
Anywhere from included-in-a-plan-you-already-pay-for (Copilot) to $15–25 per review for Claude Code Review, with most seat-based bots between $20 and $50 per developer per month. Firetrail includes 50 analyzed PRs per seat per month in each paid plan and meters $1 per extra PR ($0.75 on Business); re-analyses of a PR you've already used are free. The pricing page has a calculator.
Yes, and for agent-written code we recommend it: one bot for the lines, Firetrail for the change. The only thing to watch is comment volume, which is why Firetrail keeps to one comment per PR.
Vendor pages, opened on the date shown. We don't quote third-party review sites for prices.
The Free plan covers one repository and 50 PRs a month. Connect a low-stakes repo, open a PR, and compare its comment with what your bot posts.