# Online A Big vs PSU LibX

The clearest difference is in-app purchases: PSU LibX at none against Online A Big's 8. PSU LibX also leads on update cadence (every 4 days vs every 4 weeks) and iOS requirement (13.0 vs 15.1). On price, ads and device support there is nothing between them.

Both are free to download. Online A Big sells 5 one-off in-app purchases. PSU LibX asks for nothing beyond the download.

Online A Big ships an update every 4 weeks, PSU LibX every 4 days. The most recent releases landed on October 25, 2026 and September 28, 2026 respectively.

## The numbers

| Metric | Online A Big | PSU LibX |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 4 weeks | **Every 4 days** |
| Monetization | — | Free |
| Size | 31 MB | 50 MB |
| Requires iOS | 15.1 | **13.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [COURSE SQUARE COMPANY LIMITED](https://appshunter.io/developer/1131668582) | [PRINCE OF SONGKLA UNIVERSITY](https://appshunter.io/developer/1456089991) |

## What reviewers say

### Online A Big

[App page](https://appshunter.io/ios/app/online-a-big/id1493494981)

**Features:** macOS Compatibility

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ตะลุยโจทย์เคมี 9 วิชาสามัญ | $84.99 | one-time |
| ตะลุยโจทย์เคมี PAT2 | $84.99 | one-time |
| ตะลุยโจทย์เคมี 9 วิชาสามัญ | $89.99 | one-time |
| Org. Chem 1 เคมีมหาวิทยาลัย | $199.99 | one-time |
| Org. Chem 2 เคมีมหาวิทยาลัย | $199.99 | one-time |


### PSU LibX

[App page](https://appshunter.io/ios/app/psu-libx/id6470150838)

Enhance your library experience with this app, offering features like QR code entry, book searching across multiple campuses, and self-checkout. It also allows for fine payments and free eBook access.

**Highlights:** QR code/barcode for library entry, Search books across 5 campuses, Self-checkout books, Pay library fines, Read free eBooks, Face recognition entry, Biometric authentication

**In-app purchases:** none


## Frequently asked questions

### Is Online A Big free?

Online A Big is free to download, with in-app purchases available.

### Is PSU LibX free?

PSU LibX is free to download, with no in-app purchases.

### Do Online A Big or PSU LibX have ads?

Neither Online A Big nor PSU LibX shows ads.

### Which is updated more often, Online A Big or PSU LibX?

Online A Big ships an update every 4 weeks, and PSU LibX every 4 days. Most recently, Online A Big was updated on October 25, 2026 and PSU LibX on September 28, 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.*