# CWI Welding Exam Prep vs NDT Cert Study

The clearest difference is device support: NDT Cert Study at 3 against CWI Welding Exam Prep's 1. NDT Cert Study also leads on iOS requirement (15.1 vs 17.0). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. CWI Welding Exam Prep sells 3 in-app purchases, starting at $9.99 per month and NDT Cert Study sells 10 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | CWI Welding Exam Prep | NDT Cert Study |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (14 ratings)](https://appshunter.io/ios/app/cwi-welding-exam-prep/id6758101756/reviews)** | — |
| Number of ratings | **14** | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | Every 3 weeks |
| Monetization | Freemium | — |
| Size | 6 MB | 35 MB |
| Requires iOS | 17.0 | **15.1** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Deeun Inc.](https://appshunter.io/developer/1691824695) | [Simon Shih](https://appshunter.io/developer/1870707682) |

## What reviewers say

### CWI Welding Exam Prep

[App page](https://appshunter.io/ios/app/cwi-welding-exam-prep/id6758101756)

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:** macOS Compatibility, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Access | $9.99 | per month |
| Annual Access | $24.99 | per year |
| CWI Prep  - Lifetime Pro | $49.99 | one-time |


### NDT Cert Study

[App page](https://appshunter.io/ios/app/ndt-cert-study/id6785204471)

**Features:** macOS Compatibility

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| CGSB / MT Level II | $9.99 | one-time |
| CGSB / MT Level I | $9.99 | one-time |
| CGSB / RT Level I | $9.99 | one-time |
| CGSB / PT Level II | $9.99 | one-time |
| CGSB / PT Level I | $9.99 | one-time |
| CGSB / RT Level II | $9.99 | one-time |
| CGSB / UT Level II | $9.99 | one-time |
| CGSB / UT Level I | $9.99 | one-time |
| CGSB / PAUT Level I | $9.99 | one-time |
| CGSB / PAUT Level II | $9.99 | one-time |


## Frequently asked questions

### Is CWI Welding Exam Prep free?

CWI Welding Exam Prep is free to download, with in-app purchases available.

### Is NDT Cert Study free?

NDT Cert Study is free to download, with in-app purchases available.

### Do CWI Welding Exam Prep or NDT Cert Study have ads?

Neither CWI Welding Exam Prep nor NDT Cert Study shows ads.

### Which is updated more often, CWI Welding Exam Prep or NDT Cert Study?

CWI Welding Exam Prep ships an update every 3 weeks, and NDT Cert Study every 3 weeks. Most recently, CWI Welding Exam Prep was updated on October 24, 2026 and NDT Cert Study on October 25, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*