# IPST Catalog vs Amarin eBooks

The clearest difference is in-app purchases: IPST Catalog at none against Amarin eBooks's 12. IPST Catalog also leads on iOS requirement (9.0 vs 11.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Amarin eBooks sells 12 one-off in-app purchases. IPST Catalog asks for nothing beyond the download.

IPST Catalog ships an update every 6 months, Amarin eBooks every 10 months. The most recent releases landed on May 16, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | IPST Catalog | Amarin eBooks |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 6 months** | Every 10 months |
| Monetization | — | Free with in-app purchases |
| Size | 75 MB | 103 MB |
| Requires iOS | **9.0** | 11.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [The Institute for the Promotion of Teaching Science and Technology (IPST)](https://appshunter.io/developer/643591471) | [MEB Corporation Public Company Limited](https://appshunter.io/developer/436964329) |

## What reviewers say

### IPST Catalog

[App page](https://appshunter.io/ios/app/ipst-catalog/id772847993)

**Features:** macOS Compatibility

**In-app purchases:** none


### Amarin eBooks

[App page](https://appshunter.io/ios/app/amarin-ebooks/id1443447767)

Access a vast library of novels, including Chinese, Thai, translated, and erotic genres, alongside business, psychology, and lifestyle books. Explore diverse collections from various publishers, offering a wide range of reading material.

**Highlights:** Extensive novel collection, Business and self-help books, Lifestyle and health titles, Diverse publisher content, Online reading platform

**Features:** Vision Pro support

**In-app purchases (12)**

| Purchase | Price | Billing |
| --- | --- | --- |
| หนังสือราคา 3.99 USD | $3.99 | one-time |
| หนังสือราคา 5.99 USD | $5.99 | one-time |
| หนังสือราคา 6.99 USD | $6.99 | one-time |
| หนังสือราคา 59.99 USD | $59.99 | one-time |
| หนังสือราคา 64.99 USD | $64.99 | one-time |
| หนังสือราคา 69.99 USD | $69.99 | one-time |
| หนังสือราคา 74.99 USD | $74.99 | one-time |
| หนังสือราคา 79.99 USD | $79.99 | one-time |
| หนังสือราคา 84.99 USD | $84.99 | one-time |
| หนังสือราคา 89.99 USD | $89.99 | one-time |
| หนังสือราคา 94.99 USD | $94.99 | one-time |
| หนังสือราคา 99.99 USD | $99.99 | one-time |


## Frequently asked questions

### Is IPST Catalog free?

IPST Catalog is free to download, with no in-app purchases.

### Is Amarin eBooks free?

Amarin eBooks is free to download, with in-app purchases available.

### Do IPST Catalog or Amarin eBooks have ads?

Neither IPST Catalog nor Amarin eBooks shows ads.

### Which is updated more often, IPST Catalog or Amarin eBooks?

IPST Catalog ships an update every 6 months, and Amarin eBooks every 10 months. Most recently, IPST Catalog was updated on May 16, 2026 and Amarin eBooks on September 24, 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.*