Comparison

API 510 Highlights Practices vs API Inspector Cert Prep

Price, ratings, monetisation and update history for both apps, side by side โ€” with what reviewers say about each.

Head to head
About

API 510 Highlights Practices

Features
Read full description

This Free version only has 15 practices and 15 exams questions to show you the general view of the app. The Full Exams version includes more than 1000 questions that cover the whole sections of API 510 Closed-book test.

About

API Inspector Cert Prep

Features
Read full description

API Inspector Cert Prep helps you study for the API individual certification exams โ€” 510 (Pressure Vessel), 570 (Piping), and 653 (Aboveground Storage Tank) โ€” 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 โ€“ Pressure Vessel Inspector: 323 questions API 570 โ€“ Piping Inspector: 291 questions API 653 โ€“ 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 โ€” 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.

Screenshots

API 510 Highlights Practices4 screens
API Inspector Cert Prep4 screens

Verdict

The call

The clearest difference is in-app purchases: API 510 Highlights Practices at none against API Inspector Cert Prep's 3. API 510 Highlights Practices also leads on iOS requirement (9.1 vs 15.1). On price, update cadence, ads and device support there is nothing between them.

Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS

CostPrice ยท In-app purchases ยท Ads ยท Monetization

Both are free to download. API Inspector Cert Prep sells 3 one-off in-app purchases. API 510 Highlights Practices asks for nothing beyond the download.

UpkeepUpdate frequency

API 510 Highlights Practices ships an update every 2 months, API Inspector Cert Prep every 3 months. The most recent releases landed on October 1, 2026 and October 2, 2026 respectively.

Scorecard2 real differences ยท 4 level
API 510 Highlights Practices versus API Inspector Cert Prep: the parameters behind the verdict, then further details
ParameterAPI 510 Highlights PracticesAPI Inspector Cert Prep
PriceFreeFree
Update frequencyEvery 2 months โ€” betterEvery 3 months
AdsNoNo
In-app purchasesNo โ€” betterYes
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS9.1 โ€” better15.1
Further details โ€” not scored
Size16 MB32 MB
Age rating4+4+
DeveloperNguyen HieuSimon Shih

In-app purchases

None

API 510 Highlights Practices

No in-app purchases

3 purchases

API Inspector Cert Prep

One-time3
  • API 510 โ€“ Pressure Vessel Inspector$19.99
  • API 570 โ€“ Piping Inspector$19.99
  • API 653 โ€“ Storage Tank Inspector$19.99

Questions

Is API 510 Highlights Practices free?
API 510 Highlights Practices is free to download, with no in-app purchases.
Is API Inspector Cert Prep free?
API Inspector Cert Prep is free to download, with in-app purchases available.
Do API 510 Highlights Practices or API Inspector Cert Prep have ads?
Neither API 510 Highlights Practices nor API Inspector Cert Prep shows ads.
Which is updated more often, API 510 Highlights Practices or API Inspector Cert Prep?
API 510 Highlights Practices ships an update every 2 months, and API Inspector Cert Prep every 3 months. Most recently, API 510 Highlights Practices was updated on October 1, 2026 and API Inspector Cert Prep on October 2, 2026.

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