# J vs IUB eLibrary

The clearest difference is update cadence: J at every 2 months against IUB eLibrary's every 5 months. J also leads on iOS requirement (13.4 vs 16.6). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

J ships an update every 2 months, IUB eLibrary every 5 months. Both last shipped on September 17, 2026.

## The numbers

| Metric | J | IUB eLibrary |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 5 months |
| Size | 25 MB | 70 MB |
| Requires iOS | **13.4** | 16.6 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Informatics Publishing Limited](https://appshunter.io/developer/1490108702) | [Refread Solutions Private Limited](https://appshunter.io/developer/1495104123) |

## What reviewers say

### J

[App page](https://appshunter.io/ios/app/j-gate/id1670549103)

**In-app purchases:** none


### IUB eLibrary

[App page](https://appshunter.io/ios/app/iub-elibrary/id6451393696)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is J free?

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

### Is IUB eLibrary free?

IUB eLibrary is free to download, with no in-app purchases.

### Do J or IUB eLibrary have ads?

Neither J nor IUB eLibrary shows ads.

### Which is updated more often, J or IUB eLibrary?

J ships an update every 2 months, and IUB eLibrary every 5 months. Most recently, J was updated on September 17, 2026 and IUB eLibrary on September 17, 2026.

---

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