# NDT Cert Study vs Welding Study Guide

NDT Cert Study and Welding Study Guide are too close to call on the numbers: across 5 compared parameters — price, ads, in-app purchases and device support among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. NDT Cert Study sells 9 one-off in-app purchases and Welding Study Guide sells 3 in-app purchases, starting at $3.99 per 7 days. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | NDT Cert Study | Welding Study Guide |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | — |
| Size | 35 MB | 48 MB |
| Requires iOS | 15.1 | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Simon Shih](https://appshunter.io/developer/1870707682) | [Mobin Akhter](https://appshunter.io/developer/1812505286) |

## What reviewers say

### 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 |


### Welding Study Guide

[App page](https://appshunter.io/ios/app/welding-study-guide-gaugepass/id6800341288)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| GaugePass Weekly | $3.99 | per 7 days |
| GaugePass Annual | $29.99 | per year |
| GaugePass Lifetime | $59.99 | one-time |


## Frequently asked questions

### Is NDT Cert Study free?

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

### Is Welding Study Guide free?

Welding Study Guide is free to download, with in-app purchases available.

### Do NDT Cert Study or Welding Study Guide have ads?

Neither NDT Cert Study nor Welding Study Guide shows ads.

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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.*