Ship Fast.
And don’t break things.

AI ships faster than your test suite can keep up. Cofactor is here to change that.

Talk to the team → See how it works
~2 days
to bootstrap a regression suite
from code, tickets or natural language
<3min
PR sandbox boot
p50
90%
flake reduction
compared to Playwright
Trusted by teams at
and many more
§02 / The flow
LOCAL → PR → SUITES

Shift Left.

Cofactor enables both engineers and product experts to build regression suites. Engineers can start testing locally, actually verify your PRs (not just review them), and easily build regression suites. Non-engineers can record agentic tests using our Chrome Extension or our natural language chat builder.

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 & CLI for Claude, Cursor, and Codex
  • ✓Run multiple sessions at once — no logging out and back in
  • ✓Signs in for you, automatically
  • ✓Tell Claude to verify its work, then promote it to a regression test in one click
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 / In the wild
WHAT TEAMS SAY

What teams are saying.

QUOTE 01
“As an engineering leader, you're constantly weighing coverage against velocity. Cofactor is one of the few tools that's genuinely given us both. It's been a force multiplier for the team.”
Tom Houman
VP of Technology
Colvin Run
QUOTE 02
“Cofactor is the future of E2E testing with AI.”
Matheus Icaro
Senior Software Engineer
Fintary
QUOTE 03
“Cofactor has changed how we approach testing. We used to rely heavily on manual QA to ensure our product was ready for enterprise customers, but now we rely on Cofactor.”
Dipesh Desai
CEO
AirBills
§04 / The pitch
DEVS · QA · PMs

The easiest regression
suite you’ve ever created.

For Devs CLI

Scaffold from your editor.

Our CLI plugs into Claude Code and Codex. Ask your agent to stand up Cofactor — it writes the first dozen cases against your real app.

For QA STUDIO

Author in plain English.

Testing experts contribute through the MCP-powered chat UI. Every conversation compiles to a deterministic, replayable case.

For PMs EXTENSION

Test once. Replay forever.

If you're already clicking through the product, our Chrome extension turns that session into a case that runs on every deploy.

§05 / Integrations
WORKS WITH YOUR STACK

Fits the way
your team works.

Cofactor runs end to end inside the tools your team already uses. Kick off a test from a Slack message, get the results back on the Jira ticket, and review the run in the pull request that started it. No extra dashboard to check.

+ more coming every month
Slack integration
Just ask the agent
Mention @cofactor to run a suite or test a specific feature — in plain English, right in the channel. Results post back in-thread with pass counts, the failures that matter, and a link to the full run.
# eng-checkout
👤 maya: @cofactor run the checkout suite against PR #4127
Cofactor APP · 11:42
Regression suite Checkout — full finished against PR #4127.
247
tests
244
passed
3
failed
discount-code · invalid coupon shows toast
Expected: toast "code not found" · got: 500 error
Likely cause: apps/checkout/promo.ts:47
View runReplayFile ticket
👤 maya: /cofactor own #4127
Built for teams using →
Claude CodeCodexCursorCopilot
— or managing testing with →
Azure Dev OpsJiraLinear & more
§06 / The comparison
VS. EVERYTHING ELSE

How we
stack up.

Automation was supposed to replace expensive manual testing — but it's hard to create, brittle in practice, and a pain to maintain. Cofactor is the next generation of software testing.

Capability
No tests
Traditional E2E
Cofactor
Generated by AI from your editor
○
●
●
Tests can be written in natural language
○
○
●
Tests are deterministic traces, not selectors
○
○
●
Real isolated sandbox per PR
○
●
●
Distributed across 64+ workers
○
○
●
Diagnostics and root cause analysis
○
○
●
Anyone can write a test
○
○
●
Slack / Linear / Jira routing
○
●
●
Tests stay green when DOM is rewritten
○
○
●
Time to bootstrap suite
never
~2 weeks
~2 days
Engineer hours per week to maintain
8–20h
2–4h
<30 min
§07 / FAQ
COMMON QUESTIONS

FAQ

Don't see your question? Email hello@runcofactor.com — 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.
No. We have both a CLI and an MCP for agents, but we also have our own chat bot, a Chrome extension, and a polished web app for creating tests. Anyone on the team can contribute to the test suite in the way that matches their workflow.
When a PR opens, we boot a hermetic copy of your environment — your services, your database (seeded from a sanitized fixture set), your background workers. The full E2E suite runs against this sandbox in parallel. The sandbox tears down on PR merge.
We have extensive audit logs — videos, the actual steps the agent took, and what it was thinking when it took them. Over time we bake these tests into deterministic sequences that only change if your app changes. Tests are easy to read and review, so you can be confident you're testing the most important parts of your app.
Cloud is the default. Dedicated single-tenant deployments are available on the Enterprise tier.
§08 / Take it for a run

Stop hoping
your coding agent got it right.

Join the private beta. We onboarded a limited number of teams per month. You'll be paired with a founder for setup.

Book time with us