Comparison

API 510 Highlights Practices vs CWI Welding Exam Prep

Price, ratings, monetisation and update history for both apps, side by side — 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

CWI Welding Exam Prep

Prepare for all three parts of the AWS CWI exam with this comprehensive study tool. Features include a weld symbol decoder, discontinuity reference, and over 490 practice questions covering fundamentals, practical inspection, and code book navigation. Access a free overview and daily questions.

Highlights
  • Three-part exam preparation (Fundamentals, Practical, Code Book)
  • Weld symbol decoder based on AWS A2.4
  • Discontinuity reference with causes and acceptance criteria
  • 490+ practice questions
  • Covers welding processes, metallurgy, NDT, and safety
  • Code navigation assistance
Features
Read full description

CWI WELDING EXAM PREP: PASS ALL THREE PARTS OF THE AWS CWI EXAM The CWI exam has a 30 percent first-attempt pass rate. Most candidates fail because they treat it as a single test. It is three separate exams — Part A (Fundamentals), Part B (Practical), and Part C (Code Book) — each requiring different preparation. This app is built around all three. WELD SYMBOL DECODER Weld symbols are tested heavily on Part A and appear throughout Part C. This tool lets you build any symbol and get an instant plain-English interpretation based on AWS A2.4. Select your weld type: fillet, groove (V, bevel, U, J, square), plug, slot, spot, seam, surfacing. Choose position: arrow side, other side, both sides. Add supplementary symbols: field weld, weld all around, melt-through. Set contour and finishing requirements. Get the decoded meaning instantly. The same symbols you will interpret on blueprints every day on the job. Source: AWS A2.4 Standard Symbols for Welding, Brazing, and Nondestructive Examination — https://www.aws.org/standards DISCONTINUITY REFERENCE Identifying and classifying weld discontinuities is the core of Part B. This reference covers every discontinuity type. Covered: porosity, slag inclusion, incomplete fusion, incomplete joint penetration, undercut, overlap, cracks (longitudinal, transverse, crater), arc strikes, underfill, laminations. For each: visual description, probable causes, prevention, and AWS D1.1 acceptance criteria for both prequalified and qualified welds. Source: AWS D1.1 Structural Welding Code — https://www.aws.org/standards 490+ PRACTICE QUESTIONS Part A — Fundamentals (150 questions on actual exam): Welding processes: SMAW, GMAW, GTAW, FCAW, SAW — parameters, applications, limitations. Welding metallurgy: heat-affected zones, preheat, interpass temperature, post-weld heat treatment. Weld symbols: AWS A2.4 interpretation, construction, and supplementary symbols. Welding terminology: AWS A3.0 standard terms and definitions. NDT methods: VT, PT, MT, RT, UT — capabilities, limitations, applications. Welding safety: fire watch, PPE, fumes, electrical hazards, confined space. Part B — Practical (50 questions on actual exam): Visual inspection procedure and sequence. Discontinuity identification from descriptions and specifications. Measurement: fillet weld gauges, undercut depth, reinforcement, throat. Acceptance criteria application: when to accept, when to reject. Part C — Code Book (50 questions on actual exam): AWS D1.1 Structural Welding Code: general requirements, design, prequalification, qualification, fabrication, inspection. WPS (Welding Procedure Specification): required variables, essential variables, format. PQR (Procedure Qualification Record): test required, acceptance, documentation. Welder qualification: positions, test weld types, retesting requirements. Code navigation: finding the right clause under exam time pressure. FREE: 5 questions per day, symbol type reference, Part A overview. No account required. MONTHLY ($9.99/month): Full 490+ question bank, complete Weld Symbol Decoder, Discontinuity Reference, D1.1 Code Navigator, progress tracking by exam part, 3-day free trial. ANNUAL ($24.99/year): Everything in Monthly. Save over 75 percent. Best value. LIFETIME ($49.99): One payment. Permanent access. PASS PROMISE: Complete all questions with 80% or higher average, hold active subscription for 3 months, still do not pass. We extend your access by 4 months at no charge. voltexam.com/pass-promise AWS, CWI, and AWS D1.1 are trademarks of the American Welding Society. Not affiliated with or endorsed by AWS. Privacy Policy: https://www.voltexam.com/privacy Terms of Service: https://www.voltexam.com/terms

Screenshots

API 510 Highlights Practices4 screens
CWI Welding Exam Prep4 screens

Verdict

The call

The clearest difference is in-app purchases: API 510 Highlights Practices at none against CWI Welding Exam Prep's 3. API 510 Highlights Practices also leads on device support (3 vs 1) and iOS requirement (9.1 vs 17.0). CWI Welding Exam Prep's advantage is update cadence (every 3 weeks vs every 2 months). On price and ads 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. CWI Welding Exam Prep sells 3 in-app purchases, starting at $9.99 per month. API 510 Highlights Practices asks for nothing beyond the download.

UpkeepUpdate frequency

API 510 Highlights Practices ships an update every 2 months, CWI Welding Exam Prep every 3 weeks. The most recent releases landed on October 1, 2026 and October 16, 2026 respectively.

Scorecard4 real differences · 5 level
API 510 Highlights Practices versus CWI Welding Exam Prep: the parameters behind the verdict, then further details
ParameterAPI 510 Highlights PracticesCWI Welding Exam Prep
PriceFreeFree
Rating—5.0 (7 ratings) — better
Number of ratings—7 — better
Update frequencyEvery 2 monthsEvery 3 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
Monetization—Freemium
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS9.1 — better17.0
Further details — not scored
Size16 MB6 MB
Age rating4+4+
DeveloperNguyen HieuDeeun Inc.

In-app purchases

None

API 510 Highlights Practices

No in-app purchases

3 purchases

CWI Welding Exam Prep

Subscriptions2
  • Monthly Access3 Days trial$9.991 Month
  • Annual Access$24.991 Year
One-time1
  • CWI Prep - Lifetime Pro$49.99

Questions

Is API 510 Highlights Practices free?
API 510 Highlights Practices is free to download, with no in-app purchases.
Is CWI Welding Exam Prep free?
CWI Welding Exam Prep is free to download, with in-app purchases available.
Do API 510 Highlights Practices or CWI Welding Exam Prep have ads?
Neither API 510 Highlights Practices nor CWI Welding Exam Prep shows ads.
Which is updated more often, API 510 Highlights Practices or CWI Welding Exam Prep?
API 510 Highlights Practices ships an update every 2 months, and CWI Welding Exam Prep every 3 weeks. Most recently, API 510 Highlights Practices was updated on October 1, 2026 and CWI Welding Exam Prep on October 16, 2026.

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