# API Inspector Cert Prep vs API 570 Piping Inspector Pro

API Inspector Cert Prep and API 570 Piping Inspector Pro 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. API Inspector Cert Prep sells 3 one-off in-app purchases and API 570 Piping Inspector Pro sells 2 in-app purchases, starting at $14.99 per month. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | API Inspector Cert Prep | API 570 Piping Inspector Pro |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | — |
| Size | 32 MB | 48 MB |
| Requires iOS | **15.1** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Simon Shih](https://appshunter.io/developer/1870707682) | [Cyber Phoenix LTD](https://appshunter.io/developer/1441923160) |

## 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 |


### API 570 Piping Inspector Pro

[App page](https://appshunter.io/ios/app/api-570-piping-inspector-pro/id6810439824)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| API 570 Pro Monthly | $14.99 | per month |
| API 570 Pro Lifetime | $69.99 | one-time |


## Frequently asked questions

### Is API Inspector Cert Prep free?

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

### Is API 570 Piping Inspector Pro free?

API 570 Piping Inspector Pro is free to download, with in-app purchases available.

### Do API Inspector Cert Prep or API 570 Piping Inspector Pro have ads?

Neither API Inspector Cert Prep nor API 570 Piping Inspector Pro shows ads.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*