10 Best API 510 Certification Study Resources

How this list is ordered, and what actually decides it

The order below is by how well each option serves the question in the title, which is what the best API 510 certification study resource is for a candidate in 2026. Each option is judged on published features and prices, and every price and date was checked on 2026-09-15. There is no review score here and no third party tested anything on this list.

API 510 is a reference heavy exam: 7.5 hours in two halves, 110 closed book questions then 60 open book, with the pertinent codes supplied as PDFs on screen. That shape asks three separate things of you. You need the free Body of Knowledge to know what is examinable, a question bank to rehearse with under a clock, and the standard itself for the clause work. Work out which of those three is missing before you spend anything.

1. API 510 Prep: best for focused mobile practice with an explanation for every answer

API 510 Prep is a phone based question bank aimed at the closed book half in particular. It is out now on Google Play, with the iOS version still to come, so Android users can install it today and iPhone users cannot. The API 510 Prep app carries 613 original practice questions across all 11 Body of Knowledge domains, weighted the way the exam weights them, and every answer comes with a written explanation rather than a bare key.

There are 170 question timed mocks in two sections that mirror the real paper, 110 closed book in 165 minutes then 60 open book in 225 minutes, and a predicted score against a 75 percent target on the scored blueprint, with the caveat that API does not publish a pass mark. Calculation walkthroughs cover corrosion rate, remaining life, inspection interval, MAWP, static head, hydrotest pressure and weld sizing, and the bank works offline with spaced review of missed questions. It is free to download, with Pro at 14.99 GBP per month after a 3 day trial or 69.99 GBP once.

Where it wins

• 613 original questions across all 11 Body of Knowledge domains, weighted as the exam weights them
• 170 question timed mocks split 110 closed book in 165 minutes then 60 open book
• A written explanation for every answer plus step by step calculation walkthroughs
• Spaced review of missed questions and a full bank that works offline
• A predicted score against a 75 percent target, with the caveat that API publishes no pass mark

Where it falls short

• Android only at the moment. The app is live on Google Play but there is no iOS release yet, so iPhone users cannot use it today
• A question bank is not a taught course. There is no instructor, no live teaching and no substitute for working through the actual API 510 and ASME code books
• The Google Play listing shows 0+ downloads and no ratings yet, so there is no independent review history to lean on

The most complete mobile option for API 510 if you are on Android and want explanations rather than an answer key, but the missing iOS release and the absence of any taught content are real gaps.

2. API 510 Practice Test: best for free full length mocks on either phone platform

API 510 Practice Test from Power Engineering 101 Ltd. is free on both the App Store and Google Play, which is more than most API 510 apps manage, and it needs no sign up. Three modes cover a timed full length final exam, a practice exam with immediate right or wrong feedback, and flashcards, and the timed mock returns a performance report broken down so you can see where you are weak.

On price there is nothing to argue with: no cost to download and no in app purchase shown on the Play listing. Freshness is the catch. It ships as version 1.0, released 30 June 2025, and had not been updated more than a year later. There are no ratings or reviews on either store, no calculation walkthroughs and no clause navigation practice, so the practice questions with worked reasoning will teach you more than it will.

Where it wins

• Free on the App Store and on Google Play, with no sign up
• Timed full length final exam mode plus a practice mode and flashcards
• Performance report after the timed mock, broken down by area
• No in app purchase shown on the Play listing

Where it falls short

• Version 1.0 released 30 June 2025 and not updated more than a year later, so content freshness is unproven
• No user ratings or reviews on either store
• No calculation walkthroughs, no clause navigation practice and no study library

A genuinely useful free mock exam app and the closest direct rival on the stores, but it stops at testing you and never teaches the underlying code work.

3. API 510 Helpmate: best for building your own quizzes from a Body of Knowledge aligned bank

API 510 Helpmate from Austenite Pty Ltd is the closest like for like cross platform rival to a question bank app. It is listed on both the App Store and Google Play, free to download with in app purchases on each, and the developer says its knowledge base is aligned with the current Body of Knowledge for the pressure vessel inspector certification. Progress tracking and custom quizzes let you build a session around the areas you keep missing, and the iOS build is recent: version 1.2, released 22 April 2026.

The problem is price transparency. Neither listing publishes what the in app items cost, so the real price of the full knowledge base is unknown until you have installed it and reached a paywall. There are no ratings or reviews in the UK store, the release is recent enough that there is no track record, and question quality, explanation depth and code referencing cannot be verified from the listing.

Where it wins

• Knowledge base the developer says is aligned with the current Body of Knowledge
• Progress tracking and custom quizzes aimed at your weakest areas
• Listed on both the App Store and Google Play
• Recent iOS build: version 1.2 released 22 April 2026

Where it falls short

• No price published for the in app purchases, so the real cost is unknown until you install it
• No ratings or reviews in the UK store and a very short version history
• Question quality, explanation depth and code referencing are not verifiable from the listing

The closest cross platform rival on breadth and custom quizzes, but the opaque in app pricing makes it hard to compare value before you download.

4. API 510 Highlights Practices: best for a free taster of closed book question style on an iPhone

API 510 Highlights Practices from Nguyen Hieu is a free taster on iPhone only. The download includes a small sample, described in the listing as 15 practice and 15 exam questions, and the full question set is a paid upgrade whose price is not published. The developer describes the full version as more than 1000 questions covering every section of the API 510 closed book test, a claim that is the developer's own and is not independently verified.

Age is what rules it out as a primary resource. The last update was August 2018, version 1.2, so it cannot reflect the current Body of Knowledge or the current API 510 edition. There is no Android version on Google Play, and no ratings or reviews. It remains one of the longest standing API 510 apps in the UK storefront, so it works as a free look at question style and nothing more.

Where it wins

• Free to try, with sample practice and exam style questions
• The full version is described as more than 1000 questions covering every closed book section
• One of the longest standing API 510 apps still listed in the UK storefront
• No sign up and no cost to look at the sample

Where it falls short

• Effectively abandoned: last updated August 2018 for version 1.2, so it cannot reflect the current Body of Knowledge or the current API 510 edition
• The free download is only a taster, so it is not usable as a study plan on its own
• No Android version found on Google Play, no ratings and no reviews

Worth a look only as a free sample. The 2018 last update makes it unsafe as a primary study resource for a 2026 or 2027 exam window.

5. CASTI API ICP Exam Preparation (API 510): best for a live instructor and a fixed programme

CASTI's API ICP Exam Preparation is for a candidate who wants a live instructor and a programme anchored to a specific exam window. It comes in two formats: five days of live instructor led training, in person or remote, or self study with online lessons and email support from an e-instructor. Online practice exams are included in both, the instructor led option adds a live practice exam review, and cohorts line up with real windows, with separate start dates quoted for the September 2026 and January 2027 exams.

Cost is the whole story. It is listed at 1,995 instructor led and 995 self study, against a few tens of pounds for an app, and the page shows the dollar symbol only without spelling out the currency, so treat the currency as unverified. There is no app and no offline practice, the self study format is browser based, and the notebook ships within Canada only. Price the whole certification route before booking.

Where it wins

• Two formats: 5 days of live instructor led training in person or remote, or self study with an e-instructor
• Online practice exams included in both formats, with a live practice exam review on the instructor led option
• Cohorts scheduled against specific API windows, with start dates quoted for September 2026 and January 2027
• A course notebook is included with the instructor led option, shipping within Canada only

Where it falls short

• By far the most expensive route here: 1,995 against a few tens of pounds for an app, and the page shows the dollar symbol only, so the currency is unverified
• No mobile app and no offline practice; the self study format is browser based
• Dates and exam windows are fixed, and the notebook cannot be shipped outside Canada

A serious, structured option if your employer is paying and you want taught content plus practice exams, but it is priced for company training budgets rather than self funded candidates.

6. PetroKnowledge API 510 course: best for five day classroom or online teaching with published dates

PetroKnowledge's API 510: Pressure Vessel Inspection Code course is a well documented five day programme with transparent pricing. It covers the examinable ground including API 571, API 572, API 576 and API 577, ASME Section V and ASME Section IX, plus head and shell calculations, and a brochure and detailed daily agenda are published on the course page so you can read the syllabus before you pay.

It runs repeatedly through 2026 and 2027, with dates including 19 to 23 October 2026 in Dubai and online, 15 to 19 March 2027 in Barcelona, and 18 to 22 October 2027 in Dubai and online. The classroom fee is 5,950 USD and the online option is 4,950 USD, which saves 1,000 USD and the trip. Travel and accommodation sit on top, dates are fixed, and nothing persists after the week: no app, no question bank and no spaced review.

Where it wins

• Covers the examinable ground including API 571, API 572, API 576, API 577, ASME Section V and ASME Section IX, plus head and shell calculations
• Runs repeatedly through 2026 and 2027 in Dubai, Barcelona and online
• A brochure and a detailed daily agenda are published before you pay
• The online option is 1,000 USD cheaper than travelling to a classroom venue

Where it falls short

• Premium price, and travel, visa and accommodation costs are on top of the fee for classroom dates
• Only a handful of dates a year, and they are fixed
• Nothing persists after the week ends. There is no app, no ongoing question bank and no spaced review

A well documented five day course with transparent pricing and plenty of 2026 and 2027 dates, but it is a week out of your life and the cost dwarfs any app.

7. Wilkinson Coutts API 510 course: best for a UK blended programme with a long eLearning runway

Wilkinson Coutts runs a blended UK programme with a long runway: about four months of eLearning with question sets, followed by an intensive classroom week delivered as a virtual classroom over MS Teams. The published cohort runs eLearning from 4 September 2026 with classroom training 7 to 11 December 2026, deliberately scheduled immediately before the API exam window, and the application deadline and exam window are listed alongside the booking.

The price is 2,540 GBP excluding VAT, and API exam fees are not included, so the true cost is higher than the headline figure. The provider states a first time pass rate above 95 percent and gives the API published pass rate of about 50 percent for context, but that figure is the vendor's own and is not independently audited. The course page is also internally inconsistent, describing the classroom block as 8 days in one place and 5 days in another.

Where it wins

• Delegates complete a four month eLearning syllabus with question sets before the classroom week
• The classroom block is timed immediately before the API exam window, with the application deadline published next to the booking
• UK based in Aberdeen with virtual classroom delivery, so no travel is strictly necessary
• The provider publishes its first time pass rate claim and the API published pass rate of about 50 percent for context

Where it falls short

• The price excludes VAT and excludes the API exam fee, so the true cost is higher than the headline figure
• It is not a short course: expect roughly four months of eLearning before the classroom week, plus the exam fee
• The 95 percent pass rate claim is the vendor's own and is not independently audited, and the page describes the classroom block as both 5 days and 8 days

The strongest UK option for a candidate whose employer will fund a proper programme, provided you can commit to the four month eLearning run up.

8. The API 510 code book and free Body of Knowledge: best for the authoritative clause wording and the free syllabus

The API 510 code book with the free official Body of Knowledge and Publications Effectivity Sheet is the only genuinely authoritative option here. The Body of Knowledge PDF lists the specific topics in the exam and the Publications Effectivity Sheet lists exactly which sections of which documents are available in the open book half. Both are free from api.org, and the current Body of Knowledge covers the September 2026 to May 2027 windows.

The document itself costs money. The API 510 standard is 266.97 EUR for a DRM protected English PDF from the NSAI standards shop, and the exam fee is 875 USD for API members and 1,125 USD for non members, with recertification at 745 USD or 855 USD. A code book teaches nothing by itself: there are no questions, no explanations and no worked calculations, and DRM limits printing and annotation. Read what is in the API 510 code PDF before buying a copy.

Where it wins

• The Body of Knowledge PDF lists the specific exam topics and the Publications Effectivity Sheet lists what is available in the open book half, both free
• The certification page states the exam structure plainly: 7.5 hours, 110 closed book and 60 open book questions
• Current editions covered, with a Body of Knowledge for the September 2026 to May 2027 exam windows
• Exam and recertification fees are published, so the whole process can be budgeted

Where it falls short

• A code book teaches nothing by itself. There are no questions, no explanations and no worked calculations
• The standard is expensive for a single user and the NSAI copy is DRM protected, which limits printing and annotation
• Finding the right clause quickly under a 3.75 hour open book clock is a skill the documents do not teach you

Non negotiable for anyone serious about API 510, and the free Body of Knowledge is the single most useful page on the internet for this exam, but it is reference material rather than preparation.

9. A Quick Guide to API 510 (Matthews): best for a cheap paper walk through the syllabus

A Quick Guide to API 510 Certified Pressure Vessel Inspector Syllabus by Clifford Matthews, published by Elsevier under the Woodhead imprint, is a short paper walk through the syllabus. It supplies multiple example questions with worked answers rather than theory alone, and its chapters map to the body of knowledge references including API 510, API 572, API RP 571, API RP 577, ASME VIII, ASME V and ASME IX. Print ISBN 9781845697556 and eBook ISBN 9780857091024 cover both formats.

The author runs API 510, 570 and 653 training, and the publisher bio states his training has achieved a first time pass rate in the region of 90 percent, which is a publisher claim rather than an audited figure. The bigger issue is date: the first edition is 22 October 2010 with no later edition listed, so it predates the current API 510 edition and its code cross references. There is no question bank and no timed mock.

Where it wins

• Works through the API 510 syllabus with multiple example questions and worked answers
• Maps its chapters to the body of knowledge references including API 510, API 572, API RP 571, API RP 577, ASME VIII, ASME V and ASME IX
• Short, cheap next to a five day course, and a paper resource you can annotate
• The author runs API 510, 570 and 653 training, and the publisher bio claims a first time pass rate in the region of 90 percent

Where it falls short

• The first edition is dated 22 October 2010 and no later edition is listed, so it predates the current API 510 edition and its code cross references
• No practice exam engine, no question bank and no timed mocks
• The publisher does not display a price, so the cost depends on the retailer and the format

Cheap paper support that still explains the syllabus clearly, but the 2010 publication date means it has to be read alongside the current code rather than trusted on its own.

10. OpenExamPrep API 510 guide: best for a free first diagnostic in a browser

OpenExamPrep's API 510 study guide and practice questions is a free web resource you can use on a laptop without installing anything. It offers a chapter by chapter study guide following the Body of Knowledge sections, including inspection practices, repairs and rerating, plus flashcards and a quick facts summary covering eligibility routes. It also covers the related inspector exams in the same family, which helps if you are weighing API 510 against API 570 or API 653.

Two things hold it back. The page does not say who writes or reviews the questions, which matters in an exam where clause accuracy is everything, and the question counts on the page disagree with each other, with the title claiming 200 questions while a card on the same page lists 212. It is also web only, with no app, no offline mode and no timed mock in the real 110 plus 60 format.

Where it wins

• Free to use in a browser with no download and no account
• A chapter by chapter study guide following the Body of Knowledge sections
• Flashcards and a quick facts summary covering eligibility routes
• Covers the related inspector exams in the same family

Where it falls short

• Web only: no app, no offline mode and no timed mock matching the 110 plus 60 split
• The page does not say who writes or reviews the questions
• The question counts on the page disagree with each other, at 200 in the title and 212 on a card

A legitimate free starting point for a diagnostic, but the anonymous authorship and inconsistent question counts mean it should not be the backbone of a study plan.

Which API 510 study resource to pick

Match the resource to the gap rather than buying the biggest bundle. If you need timed practice on an Android phone, the app at the top of this list is the most complete mobile option, with an explanation for every answer and calculation walkthroughs, and it is free to try. If you are on iPhone and want free mocks today, API 510 Practice Test is free on both stores, though it has not been updated since mid 2025.

If you are buying teaching, the classroom courses explain the code better than any app here: PetroKnowledge has transparent pricing and a published agenda, Wilkinson Coutts offers a UK blended route with a four month eLearning runway, and CASTI supplies a live instructor with practice exams. If money is tight, start with the free Body of Knowledge and what the exam questions look like, then buy the single thing you are missing.