Catch the bugs before they're written.
Firetrail analyzes every pull request the moment it opens, scores its Future Debug Cost, and puts a team of senior-engineer reviewers on the PR — risk, evidence, and coaching, so your team fixes the risky change before it ever ships.
Your review team — up to ten senior reviewers on day one. Meet them →
installs as a GitHub App in minutes · advisory by default — never blocks your merges
Cause: a broad refactor and a new retry branch ship in one diff, with no test on the branch.
Consequence: a retry bug hides inside dozens of renamed files, and nobody can bisect it.
Solution: split the refactor into its own PR and add a test for the retry path.
What happens to a pull request, in four frames
Firetrail is a code review assistant for GitHub pull requests. Here is what happens to each one, start to finish.
- a pull request opens⎇ OpenPR #418
Add a retry to charge()
feature/retry-charge → main · 12 files
+142−38On any repository where the GitHub App is installed. No CI change and no config file.
- Firetrail reads all of it
The whole diff and the code around it, not just the lines that changed.
- and scores the future cost62high risk!future debug cost+25untested retry path+20frontend / backend mix
The Future Debug Cost, 0 to 100, with every point itemized so you can see what drove it.
- ten reviewers weigh in✓ 1 check · neutral💬 1 comment
Each from their own specialty, saying whether they would ship it. One comment and one neutral check on the PR.
never blocks a merge
Any language, nothing to configure, free for one repository. The longer version is further down, before the FAQ.
AI changed how we code. Firetrail changes how you review it.
An agent writes it. Someone approves it in eleven seconds. Six weeks later a customer is charged twice and nobody can find the PR that did it. Then the same PR again, with Firetrail on it.
Understand what you ship · 2:13
Captions are on by default. Toggle them in the player.
A ten-person review team on every pull request
Beyond the score, Firetrail puts a team of named senior-engineer AI reviewers on each PR. Each one judges the change from their own specialty — and tells you, in plain language, whether they'd ship it. Free puts one of them on each PR, Starter three and Pro six, and you pick which ones for each project. Business puts all ten on every PR.
The retry path isn't idempotent — a failed charge could double-bill.
Correctness, data access, reliability & operational soundness
Authorization is scoped to the org on every query — no concerns here.
Secrets, authz, tenant isolation & abuse defenses
Migration is backward-compatible, but this lookup needs an index.
Schema, constraints, indexing & migrations
Clean component, but the loading and error states are missing.
Component design, UX states & frontend performance
Nothing user-facing in this change for me to weigh in on.
Keyboard access, focus, semantics & contrast
Single responsibility holds and the new abstraction earns its keep.
Design principles & cognitive / UX laws
No timeout on the new payment call — one slow vendor and this queue backs up.
Deployability, config, observability, failure modes & rollback
The retry fix ships without a regression test — the double-bill can quietly come back.
Missing tests, boundaries, races & E2E coverage
Only the customer ID reaches the payment provider — nothing more than needed.
PII, consent, retention & third-party data sharing
The invoice list loads line items per row — that's an N+1 at any real volume.
N+1s, expensive queries, renders, bundle size & caching
The team is advisory — like the score, it never blocks your merge. Each reviewer keeps a deep private checklist and only speaks up about what your PR actually triggers, citing the files and the reasoning behind every concern.
Firetrail's analysis, inside the coding agent you already use.
Connect once with a personal token. Then ask Claude Code, Cursor, Codex, VS Code or any MCP client — in plain English, in a checkout of your repository — for the things Firetrail knows about a pull request. The agent does the local work on your account; Firetrail brings the analysis and hosts the result.
Rework a PR
BusinessFiretrail plans how to split one big PR into smaller, single-intent PRs with the findings fixed. Your agent shows you the plan and, only after you confirm, opens one draft PR per step and links them back on the original.
Review Brief
Every planOne page that explains a whole PR before you approve it: endpoints and contracts, the schema diff, the change mix, intent drift, the review team's findings, the key changes per file and a wireframe of every screen. Your agent reads the diff; Firetrail renders and hosts the page.
Security Audit
Every planA verified, evidence-only pass over your whole application (or one PR) for the five security failures that hurt teams most — data not fenced per customer, permissions only checked in the browser, records reachable by changing an ID, secrets in the code, user input rendered as HTML. Your agent reads the code; Firetrail renders a page that ranks what to fix first, explains each failure in plain words, and hands you ready-to-file issues.
Business Case
Every planEvidence for the people who decide whether a change is worth shipping, in their language. The facts — what the PR does to revenue, cost, retention, acquisition, risk or speed, each with its source and how sure it is — and what the customer will feel, the part no dashboard shows but that decides whether they buy again. Your agent reads the change; Firetrail brings the numbers from its analysis and your history, renders the page and hosts it.
coming next — same connection, more to ask for
Specialist Deep Dive
Coming nextA full report on the PR from one member of the review team in their lane — Priya on privacy, Sarah on operations, Mike on tests, Alex on performance — instead of the short verdict they give during review.
One token, one server, two minutes to set up — and every new capability is one more thing to ask for, with nothing new to install. Connect your agent → · Read the docs
Firetrail gives you the plan. You stay in control.
A mixed, risky PR doesn't need a lecture — it needs the better version. Firetrail plans it: an ordered chain of small, single-purpose PRs with the findings fixed. Your own coding agent does the work through the Firetrail MCP. You decide what ships.
Rework · PR #412
The PII fix Priya caught, alone — two lines, ships first.
The undisclosed config change, with the p99 that justifies it.
Endpoint + CSV builder + job, N+1 fixed. Reviewable without the UI.
Builds on the API PR. Loading and error states Jim asked for.
Right after the analysis, Firetrail writes the split: one intent per PR, the findings each one fixes, and what "done" means — checkable, not vibes.
One sentence in your terminal. Claude Code, Cursor, Codex or any MCP client fetches the plan through the Firetrail MCP, shows it, and — only after you say yes — opens one draft PR per step. On your account, with your credentials.
Skip a step. Tell Firetrail "do X instead of Y" and it re-plans. Nothing ever touches the original branch, nothing merges itself, and Firetrail never writes to your repository.
The new PRs get analyzed like any other. The original links to its parts — and you can see the Future Debug Cost of each piece next to the whole.
Business plan · uses the Firetrail MCP · your agent runs on your own subscription.
Understand the whole PR before you approve it.
One page from Firetrail's analysis: the endpoints and their contracts, the schema diff, the refactor-vs-feature mix, intent drift with evidence, the review team's findings, coverage, the key changes per file, and a wireframe of every screen it changes — drawn from the diff, not screenshotted. On Business, Firetrail writes it for every PR and links it from the comment; on any plan, your own coding agent writes it from a checkout. Firetrail renders and hosts it. Scannable first, zoom into anything.
Review Brief · PR #412
Endpoints and contracts, the schema diff table, the review team's findings, intent drift with evidence, coverage, and the load-bearing change in each file — with a wireframe of every screen the PR changes.
The taxonomy, the drift and the findings come straight from Firetrail's analysis of the PR. Firetrail (on Business) or your own agent reads the diff for the rest and draws the screens as wireframes, so nothing is guessed and nothing waits on the app.
Collapsed by default: skim the shape of the change in a minute, then expand a single endpoint, table or finding when you want the detail. Flows and handshakes are drawn out for you.
A brief is your analysis, surfaced. It's as rich as your plan — and on an already-analyzed PR it costs nothing extra to generate.
Automatic on Business · any plan through the Firetrail MCP, where your agent runs on your own subscription.
From pull request to risk insight, automatically.
Firetrail meets your developers where they already work — inside the PR.
Connect your repo
Install the Firetrail GitHub App and pick your repositories. No CI changes, no config files.
Every PR is analyzed automatically
On open and on every push, Firetrail fetches the diff and runs its classifiers to compute a Future Debug Cost score.
Risk + coaching land on the PR
A check and a single, tidy comment show the score, what drove it, the evidence, and a coaching suggestion — never blame.
A risk lens on every change
Deterministic facts plus AI classification — tuned to detect real production risk, not superficial churn. Pick a feature to see how it works.
Future Debug Cost score
One explainable 0–100 score per PR
One explainable 0–100 score per PR with a transparent breakdown — Low, Moderate, High, or Critical — so risk is comparable across your whole team.
- Every classifier that fires adds or subtracts visible points — no black-box number.
- A coaching headline tells the author what to do about it, not just what's wrong.
- Advisory by default: it informs the merge, never blocks it.
on the PR — the score card
Coaching, not a gate.
Firetrail is advisory by design. It surfaces risk and how to address it, while your team stays in control of the merge.
- ✓A native check shows the Future Debug Cost on the commit — pass/neutral, never a surprise block.
- ✓A single comment is updated in place on every push (no thread spam) with the score breakdown and top findings.
- ✓Your review team weighs in right in the comment — each reviewer's verdict and satisfaction at a glance.
- ✓Every finding says what caused it, what breaks if it ships as-is, and the one fix — plus the file evidence and false-positive notes.
- ✓Re-run on demand, or let it re-analyze automatically as the PR evolves.
🟠 Future Debug Cost: 62 (High)
High risk — Firetrail Risk Score 62/100.
👥 team review
🔍 what to watch
Test relevance — the failed-charge path ships untested.
- Cause: the new retry branch in
payments.rbhas no test in the diff. - Consequence: the first failed charge in production is where this branch gets tested.
- Solution: add a test for the failed-charge path before merging.
Coaching signal, not a gate · View the full analysis in Firetrail →
Not another review bot
CodeRabbit and Greptile answer “what's wrong with these lines?” — and they're good at it. Firetrail answers the question nobody was answering: what is this change likely to cost you later?
AI review bots · CodeRabbit, Greptile & friends
Review the lines
- Read the diff and comment on it, line by line
- Great at local issues — bugs on the changed lines, naming, style
- Many inline comments per PR, inside the PR
- Each review starts from zero; the judgment stays in that thread
Firetrail · change-impact intelligence
Judge the change
- Scores the change itself — one explainable Future Debug Cost, comparable across your team
- Up to ten senior reviewer verdicts on the whole change, not line nitpicks
- Remembers: bugfixes traced back to the PRs that caused them, a scar map of your repo
- Rolls up: engineering health, risk trends, and the dollars your CFO asks about
Keep your review bot — Firetrail runs happily alongside it and won't argue about naming. We're building the layer that remembers what changes cost, not a second voice in the line-comment pile-up.
The full side-by-sides, with prices: CodeRabbit · Greptile · every AI code review tool · and for agent-written PRs, how to review AI-generated code.
Prove the value — from your own bug history
Firetrail doesn't just flag risk; it proves the score predicts real bugs and estimates the debugging cost you avoid. The slide that justifies the renewal writes itself.
See your impactAverage Future Debug Cost per merged PR, weekly
Weekly average across merged PRs. The baseline is your own pre-Firetrail history — the score you were shipping at before.
Pay for the developers who ship.
Billed per seat — everyone you invite gets one, and owners can switch a seat off for anyone who doesn't need Firetrail that month. Start free and upgrade when you're ready; ~2 months off when billed annually.
Solo projects & trying it out.
- ✓1 repository
- ✓4 core risk classifiers
- ✓PR checks & comments
- ✓Team review — 1 Judge, picked per project
- ✓🔎 Review Brief via the Firetrail MCP
- ✓🛡️ Security Audit via the Firetrail MCP
- ✓📈 Business Case via the Firetrail MCP
- ✓50 PRs / month
For small teams getting started.
- ✓2 repositories
- ✓50 PRs / seat / mo, then $1 / PR
- ✓⚡ 1 Turbo Analysis / seat / mo
- ✓4 core risk classifiers + analytics
- ✓Team review — 3 Judges, picked per project
- ✓6 Judges, coverage & more on Pro
For teams shipping every day.
- ✓Unlimited repositories
- ✓50 PRs / seat / mo, then $1 / PR
- ✓⚡ 3 Turbo Analyses / seat / mo
- ✓All 10 classifiers + 10 custom
- ✓Review team — 6 Judges you pick from all 10
- ✓AI patch coverage · Historical Chat · Team Comparison
Scaling orgs at full throttle.
- ✓Everything in Pro
- ✓All 10 Judges on every PR
- ✓50 PRs / seat / mo, then $0.75 / PR
- ✓⚡ 5 Turbo Analyses / seat / mo
- ✓Origin tracing (bugfix forensics)
- ✓🔧 Rework plans via the Firetrail MCP
- ✓🔎 Automatic Review Brief on every PR
- ✓Unlimited custom classifiers
- ✓Priority support
Every seat includes 50 analyzed PRs per month; beyond that it's a small per-PR rate, so a busy month is a predictable add-on rather than a surprise bill. Only distinct PRs count — pushes and re-analyses of the same PR are free (teams average ~2.2 analysis runs per PR; you pay for the PR once). Billed per active developer (only those who opened a PR), with ~2 months free on annual plans.
Want to know exactly what you'd spend?
Model your team size and PR volume — seats, overage, annual, all of it — on the same math our billing runs on.
Firetrail, in plain words
Six answers with the exact facts, for anyone who wants them spelled out before the FAQ.
- What Firetrail is
- A code review assistant for GitHub pull requests. When a PR opens, Firetrail reads the diff, scores how much future debugging the change is likely to cause (the Future Debug Cost, 0 to 100), lists what added points, and has a team of AI reviewers with different specialties read the whole change and say whether they would ship it. The result is one comment and one neutral check on the PR, with the full detail in the app.
- Who it is for
- Software teams that review pull requests on GitHub: a solo developer on the Free plan, a small team on Starter, an engineering organization on Pro or Business. It helps most where code is written or generated faster than reviewers can read it, and where nobody wants a bot that blocks merges.
- What makes it different
- Most review bots comment on lines. Firetrail judges the change as a whole: what it will likely cost later, whether the PR does things its description never mentioned, how much of the new code its own tests exercise and, on Business, which past PRs a bugfix traces back to. It is advisory by default and only blocks a merge if you turn on Merge Checks yourself.
- Integrations
- GitHub, installed as a GitHub App on the repositories you choose; GitLab and Bitbucket are not supported today. Claude Code, Cursor, Codex, VS Code or any other MCP client can connect to the Firetrail MCP server for Review Briefs, Security Audits and, on Business, Rework plans. No CI changes and no configuration files.
- Languages
- Any language and any framework. The analysis is done by AI reading the diff, not by language-specific parsers, so there is nothing to set up. It also means every number is an informed estimate rather than a measurement, which is why each one comes with the evidence behind it.
- Pricing
- Free for one repository and up to 50 analyzed PRs a month, no card required. Paid plans are $24 (Starter), $39 (Pro) and $49 (Business) per active developer per month, each with 50 analyzed PRs per seat and a per-PR rate after that. Yearly billing charges 10 months for 12. Full pricing.
The questions you actually have
Including the awkward ones. If yours isn't here, the security page and docs go deeper.
Who is Firetrail for?
Teams that review pull requests on GitHub and want to know which changes deserve a careful read. A solo developer can use it free on one repository; small teams and engineering organizations run it across every repository on Starter, Pro or Business. It is most useful where code is written or generated faster than reviewers can read it.
Which languages and frameworks does it support?
All of them. The analysis is done by AI reading the diff, not by language-specific parsers, so a Ruby monolith, a TypeScript frontend, a Go service or an infrastructure repository get the same treatment with nothing to configure. The trade-off is that every number is an informed estimate, and Firetrail shows the evidence behind each one so you can judge it.
Does it work with GitLab or Bitbucket?
Not today. Firetrail installs as a GitHub App and only analyzes GitHub pull requests. If you need GitLab or Bitbucket, tell us at [email protected] so we know how many teams are waiting.
What exactly does Firetrail send to the AI?
The pull request's diff — the changed files' patches, title, description, and file metadata. Not your repository: we never clone it or read code the PR didn't touch. The full breakdown, including what we store and for how long, is on the security page.
Is my code used to train AI models?
No. Analysis runs on Anthropic's Claude models over their commercial API, where customer data is not used for training — and we don't train anything on your code either. Details on the security page.
“Future Debug Cost” — why should I trust an invented metric?
Every metric is invented — story points, code coverage, DORA, all of them. What matters is whether it points somewhere useful. FDC doesn't claim to be a peer-reviewed standard: it's years of engineering scar tissue distilled into a direction — imprecise, imperfect, and still the difference between walking into a risky change blind or warned. And it's never a black box: every point comes from a named classifier you can see, challenge with agree/disagree feedback, and watch it prove itself against your own bug history via origin tracing.
Are you SOC 2 certified?
Not yet — we're a young company and we'd rather say that plainly than hide it behind padlock icons. What we do today — minimal payloads, scoped GitHub access, self-serve export and deletion, a written DPA — is documented in specifics on the security page.
Will it spam my PRs or block my merges?
Neither. One comment per PR, updated in place on every push — no thread spam. And Firetrail is advisory by default: the check is always neutral, your team owns the merge. The only exception is Merge Checks on the Business plan — opt-in, bound to objective drivers, and required to prove themselves in simulation mode before they're allowed to block anything.
How is this different from CodeRabbit or Greptile?
They review the lines; we judge the change. Review bots comment on the diff — Firetrail scores what the change will likely cost you later, has a team of senior reviewers give verdicts, and remembers the outcome by tracing bugfixes back to the PRs that caused them. See the side-by-side — and yes, they run happily together.
How much does Firetrail cost?
Free covers one repository and up to 50 analyzed PRs a month, with no card. Paid plans are $24 (Starter), $39 (Pro) and $49 (Business) per active developer per month, each with 50 analyzed PRs per seat. Yearly billing charges 10 months for 12. The pricing page has the full comparison and a cost calculator.
What happens after my 50 included PRs in a month?
First: only distinct PRs count — pushes and re-analyses of a PR you've already used are free. Past the allowance, paid plans meter extra PRs at a small per-PR rate on the same invoice ($1 Starter and Pro, $0.75 Business) — analysis never stops. On Free there's no metering at all: analysis pauses at 50 and resumes next month, so it can never become a surprise bill. Model your exact number in the cost calculator.
What happens when the AI gets it wrong?
It sometimes will, and the product is built for that: every verdict lists its own false-positive considerations (the model argues against itself), agree/disagree feedback tunes what your team sees, and because everything is advisory, a wrong call costs you a glance — never a blocked merge.
More depth: Security & privacy · Documentation · Full pricing
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