# Ykjam Terjime vs API Inspector Cert Prep

The clearest difference is in-app purchases: Ykjam Terjime at none against API Inspector Cert Prep's 3. API Inspector Cert Prep's advantage is update cadence (every 3 months vs every 7 months). 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. Ykjam Terjime asks for nothing beyond the download.

Ykjam Terjime ships an update every 7 months, API Inspector Cert Prep every 3 months. The most recent releases landed on October 6, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | Ykjam Terjime | API Inspector Cert Prep |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 3 months** |
| Size | 36 MB | 32 MB |
| Requires iOS | 15.1 | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Seydi Charyyev](https://appshunter.io/developer/1870725690) | [Simon Shih](https://appshunter.io/developer/1870707682) |

## What reviewers say

### Ykjam Terjime

[App page](https://appshunter.io/ios/app/ykjam-terjime/id6758071845)

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

**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 Ykjam Terjime free?

Ykjam Terjime 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 Ykjam Terjime or API Inspector Cert Prep have ads?

Neither Ykjam Terjime nor API Inspector Cert Prep shows ads.

### Which is updated more often, Ykjam Terjime or API Inspector Cert Prep?

Ykjam Terjime ships an update every 7 months, and API Inspector Cert Prep every 3 months. Most recently, Ykjam Terjime was updated on October 6, 2026 and API Inspector Cert Prep on October 19, 2026.

---

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