Cofactor / Manifest 001 Rev. 2026.05 SF · NYC Confidential
⚠ AI ships faster than your test suite can keep up

Ship Fast.
And don’t break things.

Testing made easy across the whole SDLC and your whole team.

Talk to the team See how it works
94%
flake reduction
vs. Cypress
<3min
PR sandbox boot
p50
8.2×
test coverage
after 30 days
Built for teams using →
Claude CodeCursorGitHub CopilotContinueAiderWindsurfZed Agent
LOCAL → PR → SUITES

One platform.
Three checkpoints.

Cofactor shows up wherever your team already works — your editor, your PRs, and your test dashboard — without asking anyone to learn a new tool.

PRODUCT 01 — LOCAL

Pair with Claude & Cursor in a real browser.

Spin up a session from your editor. The agent drives a live browser alongside you — clicking, typing, asserting — and turns the trace into a reusable test.

  • MCP server for Claude, Cursor, Codex
  • Driven by Playwright under the hood
  • Captures HAR, console, and screenshots
  • Exports to your existing test runner
Read the local docs
localhost:3000 · paired with cofactor
LOCAL SESSION
Checkout/cart/checkout
Email — taylor@acme.co
Card · 4242 4242 4242 4242
ZIP · 94110
step 01 / 05·happy path
▸_cofactor agent · live
you→ test checkout with invalid zip
·opened localhost:3000
·filled email, card, zip
·expect inline error
saw 500 from /validate-zip
cofactor→ captured network HAR
cofactor→ drafted regression in PR #482
§03 / The hard problem
FLAKE & SCALE
⚠ The dirty secret of E2E testing

Flaky tests are trust debt.

The reason most teams stop running E2E tests isn't because they're slow. It's because they lie. A failing build that passes on retry teaches your team to ignore the dashboard.

Cofactor uses a model trained on millions of real test runs to tell you, with a confidence score, whether a failure is your code or your infrastructure. Then we run it on enough hardware to never make you wait for the answer.

FLAKE CLASSIFIER · LIVE
race-condition · network suppress
animation · timing dependent suppress
real bug · null reference fail PR
3rd-party API · sentry SDK suppress
real bug · tax calc rounding fail PR
model · cofactor-flake-v3 updated 14 min ago
Distributed by default
Suites shard across 64 ephemeral workers per run. The full suite finishes in the time of the slowest test.
Real browsers, real APIs
No headless tricks. Every sandbox is a full Chrome stack with your real services seeded from production fixtures.
Deterministic replay
Tests record traces, not selectors. A DOM rewrite doesn't break the test if the user-visible behavior didn't.
WORKS WITH YOUR STACK

Fits the way
your team works.

Cofactor isn't another dashboard to check. It plugs into the tools you already live in — and routes the right signal to the right human, automatically.

+ Discord, Teams, PagerDuty,
Datadog, Sentry, Notion
Slack integration
Triage from your standup channel
Failures route to the channel that owns the code. Reply with /cofactor rerun, /cofactor own, or /cofactor explain.
# eng-checkout
Cofactor APP · 11:42
🚨 PR #4127 introduced 3 regressions in checkout.
discount-code · invalid coupon shows toast
Expected: toast "code not found" · got: 500 error
Likely cause: apps/checkout/promo.ts:47
ReplayOpen in IDEDismiss
👤 maya: /cofactor own #4127
§05 / The math
VS. EVERYTHING ELSE

The honest
comparison.

We're not a faster Cypress. We're what you'd build if you started from "AI is writing the code now" and asked what testing should look like. Spoiler: not a directory of .spec.ts files.

Capability
No tests
Traditional E2E
Cofactor
Generated by AI from your editor
Tests are deterministic traces, not selectors
Real isolated sandbox per PR
Distributed across 64+ workers
Flake classifier with confidence scores
Auto-curated regression suite
Slack / Linear / Jira routing
Tests stay green when DOM is rewritten
Time to bootstrap suite
∞ months
~2 weeks
~2 days
Engineer hours per week to maintain
8–20h
2–4h
<30 min
§06 / In the wild
WHAT TEAMS SAY

Receipts from the private beta.

QUOTE 01 VERIFIED
“We deleted our Cypress repo in week three. Cofactor is the first testing tool I've actually wanted to open the dashboard for.”
Priya Anand
Staff Eng, infra
Halcyon
QUOTE 02 VERIFIED
“Our PR cycle dropped from 'merge Friday, find out Monday' to 'merge and forget'. The flake classifier alone is worth the contract.”
Marcus Liu
VP Engineering
Frame.dev
QUOTE 03 VERIFIED
“I asked Claude to add a test for the new onboarding step. It used the Cofactor MCP, recorded a real flow, and it just shipped. I didn't write a line of test code.”
Devon Park
Senior PM
Layer
§07 / FAQ
ANSWERED HONESTLY

Things you'll
probably ask.

Don't see your question? Email hello@cofactor.dev — a real human responds within 24h.

Playwright is a browser driver. Cofactor is a platform: AI generates the tests for you, every PR gets a full sandboxed environment, a model decides what counts as a real failure, and tests are continuously curated into a regression suite. You can wire Playwright into a YAML file. You cannot wire it into your team's judgment.
§09 / Take it for a run
⚠ Limited cohort · 12 teams per month

Stop hoping
your AI got it right.

Join the private beta. We onboard 12 teams a month — you'll be paired with a founder for setup. First month is on us.

↳ no credit card ↳ founder-led onboarding ↳ first month free