PMI vs API Inspector Cert Prep
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
PMI
Prepare for your certification exam with practice questions and detailed explanations. Focus on areas needing improvement and simulate real exam conditions for increased confidence. Content is updated regularly to ensure relevance.
- Monthly updated questions for 2026
- Exact-filtering for mistake focus
- Save difficult questions offline
- Examination mode simulation
- Nearly 100% questions with explanations
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Non-Affiliation Disclaimer (PMI-ACP) This app is an independent exam preparation resource and is not affiliated with, endorsed by, or connected with the Project Management Institute (PMI). All practice materials are created solely for educational purposes. Trademark Notice (PMI-ACP) PMI, PMI-ACP, and related certification names are trademarks or registered trademarks of the Project Management Institute, Inc. Any references to PMI exams or terminology are for identification only and do not imply official endorsement. ===== There are many questions on the web that are either outdated or wrongly answered. I am trying here to filter all those questions and provide you with a nice tool to practice the exam similar to the real-life exam as much as possible. This small app was designed with love to help you 5 things: 1.question content is updated monthly in 2026, so you don’t have to worry that these question is outdated anymore. 2.With 2 EXACT-FILTERING features, you can focus easily on questions you are making mistakes or missing. 3.Save difficult questions offline. So you can practice them later when you have free time. 4.Examination mode will help you take test like a real exam. So you will be more confident. 5.NEARLY-100% questions are packed with straightforward explanations. You will know why it is correct or wrong. No more confusing. In sum, this app is simple and straight-to-the-point like description you are reading. Have fun and enjoy the app!
API Inspector Cert Prep
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API Inspector Cert Prep helps you study for the API individual certification exams — 510 (Pressure Vessel), 570 (Piping), and 653 (Aboveground Storage Tank) — with a large bank of exam-style practice questions and realistic timed mock exams. Each certification is its own module you can unlock, built from that exam's published Body of Knowledge and the codes and recommended practices it references. WHAT'S INSIDE API 510 – Pressure Vessel Inspector: 323 questions API 570 – Piping Inspector: 291 questions API 653 – Aboveground Storage Tank Inspector: 251 questions PRACTICE THE WAY YOU LEARN - Practice mode covers the whole module, ordered to surface your weak areas first - Drill any single topic on its own - Every question includes a worked explanation with the relevant code reference - Timed mock exams mirror exam-day pace, with a running clock and a scored result TRACK YOUR READINESS - Per-topic and overall readiness show exactly where you stand - Spaced-repetition scheduling brings back what you keep missing - Review any missed question, and save the tricky ones for later - Exam history keeps a record of your past mock exams PLAN AROUND YOUR TEST DATE - Set your exam date and get a daily target to cover the bank in time - See days remaining and current readiness at a glance BUILT TO JUST WORK - No account, no login — everything stays on your device - Works fully offline; the only network use is purchases - Light, dark, and system themes Buy only the modules you need. A free sample of each module is available before you unlock it.
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Verdict
The clearest difference is update cadence: API Inspector Cert Prep at every 3 months against PMI's every 12 months. PMI's advantage is iOS requirement (10.0 vs 15.1). On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. PMI sells 2 one-off in-app purchases and API Inspector Cert Prep sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.
PMI ships an update every 12 months, API Inspector Cert Prep every 3 months. The most recent releases landed on September 28, 2026 and October 25, 2026 respectively.
| Parameter | PMI | API Inspector Cert Prep |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 12 months | Every 3 months — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 10.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 25 MB | 32 MB |
| Age rating | 4+ | 4+ |
| Developer | Trieu Tran | Simon Shih |
In-app purchases
PMI
- 4.99$ For All Premium Features$4.99
- Unlock all premium content$7.99
API Inspector Cert Prep
- API 510 – Pressure Vessel Inspector$19.99
- API 570 – Piping Inspector$19.99
- API 653 – Storage Tank Inspector$19.99
Questions
Is PMI free?
Is API Inspector Cert Prep free?
Do PMI or API Inspector Cert Prep have ads?
Which is updated more often, PMI or API Inspector Cert Prep?
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