# NDT Worldwide vs NDT Cert Study

The clearest difference is update cadence: NDT Cert Study at every 2 months against NDT Worldwide's every 16 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. NDT Worldwide sells 10 one-off in-app purchases and NDT Cert Study sells 9 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

NDT Worldwide ships an update every 16 months, NDT Cert Study every 2 months. The most recent releases landed on October 7, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | NDT Worldwide | NDT Cert Study |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 16 months | **Every 2 months** |
| Size | 265 MB | 35 MB |
| Requires iOS | 15.6 | **15.1** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [WWNDT SERVICES PRIVATE LIMITED](https://appshunter.io/developer/1570208273) | [Simon Shih](https://appshunter.io/developer/1870707682) |

## What reviewers say

### NDT Worldwide

[App page](https://appshunter.io/ios/app/ndt-worldwide/id1607234047)

**Features:** macOS Compatibility, Apple Wallet

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ASTM E165 | $44.99 | one-time |
| ASTM E2582 | $44.99 | one-time |
| ASTM E2375 | $54.99 | one-time |
| ASTM E709 | $54.99 | one-time |
| ASTM E2375 | $69.99 | one-time |
| ASNT MT Level III Examination | $219.99 | one-time |
| ASNT NDT Level III-BASIC | $299.99 | one-time |
| ASNT UT Level III Examination | $299.99 | one-time |
| ASNT ML Level III Examination | $399.99 | one-time |
| ASNT NDT Level III BASIC | $449.99 | 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 NDT Worldwide free?

NDT Worldwide 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 NDT Worldwide or NDT Cert Study have ads?

Neither NDT Worldwide nor NDT Cert Study shows ads.

### Which is updated more often, NDT Worldwide or NDT Cert Study?

NDT Worldwide ships an update every 16 months, and NDT Cert Study every 2 months. Most recently, NDT Worldwide was updated on October 7, 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.*