Final state over success screens
It treats “payment succeeded” as unfinished until access, credits, and records end in the right state.
Free interactive lab · no login · no file upload
Most AI-built apps do not fail because the demo looks bad. They fail when the first real user hits the boring parts: auth, payment state, webhooks, plan access, data boundaries, AI output trust, and support recovery.
The hook
The simulator forces the app through real launch situations: delayed webhooks, duplicate payment events, canceled subscriptions, user data boundaries, AI hallucinations, missing logs, and client delivery pressure. The result is a risk profile and a 72-hour rescue plan, not vague advice.
It treats “payment succeeded” as unfinished until access, credits, and records end in the right state.
It checks whether AI output, private data, and user permissions have understandable limits.
It asks whether the first broken user can be diagnosed and recovered without guessing.
Run the lab
Answer honestly. “Not sure” is treated as risk because real users do not care whether the failure was planned to be fixed later.
If you want to self-fix
Worksheets for buyer interviews, one-page offers, scope boundaries, and a simple lead and revenue ledger.
Get the kitIf one flow can break money or trust
Pick one risky flow. I run 10 focused checks and send back evidence, repro notes, and a smallest-fix-first action plan within 2 days.
Book the one-flow reviewIf you need the full method
A deeper guide for getting paid before you overbuild: buyer evidence, paid pilots, delivery boundaries, and practical worksheets.
Read the guideWant a human second pass?
If the simulator exposed a money, access, data, or AI-output risk, send the app URL and the flow you are worried about. Do not send passwords, API keys, private customer data, or sensitive files.