# Doawise NDT Guide vs API Inspector Cert Prep

The clearest difference is in-app purchases: Doawise NDT Guide at none against API Inspector Cert Prep's 3. On price, ads, 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. Doawise NDT Guide asks for nothing beyond the download.

## The numbers

| Metric | Doawise NDT Guide | API Inspector Cert Prep |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | — | Every 3 months |
| Size | 59 MB | 32 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [CANER YAVUZ](https://appshunter.io/developer/1877125543) | [Simon Shih](https://appshunter.io/developer/1870707682) |

## What reviewers say

### Doawise NDT Guide

[App page](https://appshunter.io/ios/app/doawise-ndt-guide/id6759167647)

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is Doawise NDT Guide free?

Doawise NDT Guide is free to download, with no in-app purchases.

### Is API Inspector Cert Prep free?

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

### Do Doawise NDT Guide or API Inspector Cert Prep have ads?

Neither Doawise NDT Guide nor API Inspector Cert Prep 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.*