Cairn
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Introduction

Cairn is an agentic end-to-end testing platform. You connect a GitHub repository and Cairn does the work a QA engineer would: it learns your app, writes the tests, keeps them in sync as you ship, runs them, and when something breaks it tells you why and opens a fix.

The loop

Connect → Map flows → Generate tests → Sync on push → Run → Detect → Fix
  1. Connect — install the Cairn GitHub App on a repo. No CI config.
  2. Map — Cairn reads your pages, layouts, and routes and surfaces the real user flows (sign-in, checkout, settings…).
  3. Generate — each flow becomes a complete Playwright spec — selectors, assertions, and session auth included.
  4. Sync — on every push to main or staging, Cairn diffs the change, updates the affected tests, and writes new specs for new pages.
  5. Run — tests run on a schedule and on every merge in real Chromium, with video + trace captured.
  6. Detect — a failure becomes a root-caused issue: Cairn reads the network layer, names the failing API call, and spots contract drift.
  7. Fix — Claude triages the root cause and opens a merge-ready PR.

What else Cairn watches

  • API contract tracking — Cairn fingerprints every API response your flows touch and watches it for breaking drift, so a UI failure comes with the backend reason, not just a red X.
  • Security recon — a deterministic pass probes each deploy for exposed files, source maps, leaked storage, and access-control gaps, filed by severity.
  • Weekly recap — a Monday digest of what Cairn observed (pass-rate trend, regressions caught, auto-fix rate, new exposures, API drift), emailed to your team.

Who it's for

Teams that ship a web app and want real E2E coverage without writing or maintaining the tests — and engineers who want failures that come with a root cause and a fix, not just an alert.

Next steps