# API 510 Highlights Practices vs NDT Worldwide

The clearest difference is in-app purchases: API 510 Highlights Practices at none against NDT Worldwide's 10. API 510 Highlights Practices also leads on update cadence (every 2 months vs every 16 months) and iOS requirement (9.1 vs 15.6). On price, ads and device support there is nothing between them.

Both are free to download. NDT Worldwide sells 10 one-off in-app purchases. API 510 Highlights Practices asks for nothing beyond the download.

API 510 Highlights Practices ships an update every 2 months, NDT Worldwide every 16 months. The most recent releases landed on October 1, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | API 510 Highlights Practices | NDT Worldwide |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 16 months |
| Size | 16 MB | 265 MB |
| Requires iOS | **9.1** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Nguyen Hieu](https://appshunter.io/developer/1323491316) | [WWNDT SERVICES PRIVATE LIMITED](https://appshunter.io/developer/1570208273) |

## What reviewers say

### API 510 Highlights Practices

[App page](https://appshunter.io/ios/app/api-510-highlights-practices/id1362433334)

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is API 510 Highlights Practices free?

API 510 Highlights Practices is free to download, with no in-app purchases.

### Is NDT Worldwide free?

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

### Do API 510 Highlights Practices or NDT Worldwide have ads?

Neither API 510 Highlights Practices nor NDT Worldwide shows ads.

### Which is updated more often, API 510 Highlights Practices or NDT Worldwide?

API 510 Highlights Practices ships an update every 2 months, and NDT Worldwide every 16 months. Most recently, API 510 Highlights Practices was updated on October 1, 2026 and NDT Worldwide on October 7, 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.*