# CWI Exam Prep vs NDT Cert Study

The clearest difference is update cadence: CWI Exam Prep at fortnightly against NDT Cert Study's every 2 months. NDT Cert Study's advantage is iOS requirement (15.1 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. CWI Exam Prep sells 6 in-app purchases, starting at $7.99 per 7 days and NDT Cert Study sells 9 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

CWI Exam Prep ships an update fortnightly, NDT Cert Study every 2 months. The most recent releases landed on October 17, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | CWI Exam Prep | NDT Cert Study |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (7 ratings)](https://appshunter.io/ios/app/cwi-exam-prep/id6757098883/reviews)** | — |
| Number of ratings | **7** | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 2 months |
| Monetization | Free with in-app purchases | — |
| Size | 21 MB | 35 MB |
| Requires iOS | 17.0 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Forwa Elade Wunde](https://appshunter.io/developer/1685241344) | [Simon Shih](https://appshunter.io/developer/1870707682) |

## What reviewers say

### CWI Exam Prep

[App page](https://appshunter.io/ios/app/cwi-exam-prep/id6757098883)

Master essential topics for your Certified Welding Inspector exam with fun and engaging quizzes. This app boosts knowledge, confidence, and skills for students, practitioners, and enthusiasts in the welding field.

**Highlights:** Comprehensive quiz coverage, Engaging learning experience, Boosts knowledge and confidence, Covers all essential CWI topics, Ideal for students and professionals

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 Week | $7.99 | per 7 days |
| 1 Month | $19.99 | per month |
| 1 Year | $29.99 | per year |
| 1500 | $1.99 | one-time |
| 3500 | $2.99 | one-time |
| 9000 | $4.99 | one-time |


### NDT Cert Study

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

**Features:** macOS Compatibility

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 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 Exam Prep free?

CWI 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 Exam Prep or NDT Cert Study have ads?

Neither CWI Exam Prep nor NDT Cert Study shows ads.

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

CWI Exam Prep ships an update fortnightly, and NDT Cert Study every 2 months. Most recently, CWI Exam Prep was updated on October 17, 2026 and NDT Cert Study on October 8, 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.*