A 200 OK does not mean checkout, signup, or billing still works. Keep the business-critical journeys running after merge so your team finds the regression before support does.
“We found out a critical purchase path was broken because a customer tweeted about it. That was a bad Monday.”
Engineering lead, Series B fintechsource
“Synthetic monitoring tells us the homepage loads. It doesn't tell us if a user can actually complete a purchase.”
SRE, e-commerce platformsource
“Our staging environment is a lie. Half the bugs that hit production are from things that work perfectly in staging.”
CTO, B2B SaaSsource
68% of production outages are discovered by users, not monitoring (Slack State of Incidents)
Third-party API failures account for 35% of user-facing incidents
Mean time to detection for checkout failures: 47 minutes without E2E monitoring
Synthetic monitoring (Datadog, Pingdom) checks if pages load, not if user flows work
Uptime monitoring misses functional regressions entirely — your site is ‘up’ but checkout is broken
Building custom production smoke tests requires maintaining a separate test suite from CI
Most teams only run E2E tests pre-merge, leaving production unmonitored between deploys
A third-party dependency changes behavior on a Saturday. Your checkout page loads fine because Pingdom says 200 OK, but the purchase flow is broken. A customer emails support on Monday morning. The on-call engineer spends 2 hours debugging. Revenue lost: 36 hours of failed checkouts.
Zerocheck runs approved critical tests against production after a production URL is configured. At 2:14am Saturday, an approved checkout smoke test fails. The Slack alert includes the recording, screenshots, and step trace the team needs to fix the regression before the next business day.
Keep approved critical journeys running against production
Use tighter schedules for revenue paths and quieter schedules for lower-risk checks
Confirm failures before waking the team
Alert Slack with browser evidence engineers can act on
Keep a record of what failed, when, and what the browser saw
Other tools prove their own platform is secure. Zerocheck produces JSON evidence from your executed application tests.
Get coverage on the flows customers will notice when they break, without turning testing into a quarter-long infrastructure project.
Guard the only code path where a bug is measured in lost dollars per minute.
Synthetic monitors check if a page loads or an API returns 200. Zerocheck runs approved browser tests against real user flows such as checkout smoke, sign-in, onboarding, and billing. It catches functional regressions that synthetic pings miss entirely.
Use dedicated test accounts and non-destructive approved flows. Production monitoring tests should observe critical functionality without using real payment data or destructive account actions.
Keep production monitors to approved, high-signal critical flows and use the run evidence to separate a real broken journey from a transient network issue. The alert should show what the browser saw, not just that a check failed.
Zerocheck runs a real browser against your production URL, similar to a single user session. Use dedicated test accounts and non-destructive flows so monitoring verifies the journey without creating business data or load surprises.
Your CI passed. Your PR merged. Do not wait for customers to discover the regression.
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