# API Inspector Cert Prep vs NDT Exam Wizard

The clearest difference is ads: API Inspector Cert Prep at none against NDT Exam Wizard's shown. NDT Exam Wizard's advantage is update cadence (every 5 days vs every 3 months). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. API Inspector Cert Prep sells 3 one-off in-app purchases and NDT Exam Wizard sells 2 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

API Inspector Cert Prep ships an update every 3 months, NDT Exam Wizard every 5 days. The most recent releases landed on October 2, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | API Inspector Cert Prep | NDT Exam Wizard |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 3 months | **Every 5 days** |
| Size | 32 MB | 35 MB |
| Requires iOS | **15.1** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Simon Shih](https://appshunter.io/developer/1870707682) | [Alba Enterprises, LLC](https://appshunter.io/developer/6789434420) |

## What reviewers say

### API Inspector Cert Prep

[App page](https://appshunter.io/ios/app/api-inspector-cert-prep/id6785875538)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| API 510 – Pressure Vessel Inspector | $19.99 | one-time |
| API 570 – Piping Inspector | $19.99 | one-time |
| API 653 – Storage Tank Inspector | $19.99 | one-time |


### NDT Exam Wizard

[App page](https://appshunter.io/ios/app/ndt-exam-wizard/id6789434418)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Subscription | $9.99 | per month |
| Yearly Subscription | $399.99 | per year |


## Frequently asked questions

### Is API Inspector Cert Prep free?

API Inspector Cert Prep is free to download, with in-app purchases available.

### Is NDT Exam Wizard free?

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

### Do API Inspector Cert Prep or NDT Exam Wizard have ads?

NDT Exam Wizard shows ads; API Inspector Cert Prep does not.

### Which is updated more often, API Inspector Cert Prep or NDT Exam Wizard?

API Inspector Cert Prep ships an update every 3 months, and NDT Exam Wizard every 5 days. Most recently, API Inspector Cert Prep was updated on October 2, 2026 and NDT Exam Wizard on September 30, 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.*