865 exam-style questions across the pressure vessel, piping, and aboveground storage tank inspector certifications. Each question comes with a worked explanation and the relevant code reference.
API 510 Pressure Vessel Inspector with 323 questions. API 570 Piping Inspector with 291. API 653 Aboveground Storage Tank Inspector with 251. Each module is built from that exam's published Body of Knowledge and the codes it references.
Mock exams that mirror exam-day pace, with a running clock and a scored result. Exam history keeps a record of past attempts.
Every question includes a worked explanation with the relevant code reference, so you learn the reasoning behind each answer.
Per-topic and overall readiness show exactly where you stand. Practice mode orders questions to surface weak areas first.
Questions you keep missing come back on a schedule. Review missed questions and save the tricky ones for another pass.
Set your test date and get a daily target to cover the bank in time, with days remaining and current readiness at a glance.
The app runs fully offline with no account and no login. Everything stays on your device, and the only network use is purchases. Buy only the modules you need. A free sample of each module is available before you unlock it.
API Inspector Cert Prep is built by Simon Shih, who spent 20 years in oil and gas inspection, including a decade in QA at an AUT inspection firm. The question bank is written from that working knowledge of the codes.
API Inspector Cert Prep is an independent study aid. It is not affiliated with, endorsed by, or sponsored by the American Petroleum Institute.
865 across the three certifications: 323 for API 510, 291 for API 570, and 251 for API 653.
No. Each certification is its own module, and a free sample of each is available before you unlock it.
Yes. The app works fully offline with no account required. The only network use is purchases.
Each module is built from that exam's published Body of Knowledge and the codes and recommended practices it references.