# ReadDi E vs COJ Library

The clearest difference is update cadence: COJ Library at fortnightly against ReadDi E's every 8 months. COJ Library also leads on iOS requirement (10.0 vs 13.0). 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.

ReadDi E ships an update every 8 months, COJ Library fortnightly. The most recent releases landed on September 17, 2026 and September 12, 2026 respectively.

## The numbers

| Metric | ReadDi E | COJ Library |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 8 months | **Fortnightly** |
| Size | 8 MB | 30 MB |
| Requires iOS | 13.0 | **10.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 17+ |
| Developer | [BOOKDOSE COMPANY LIMITED](https://appshunter.io/developer/459445000) | [Loxley Orbit Public Company Limited](https://appshunter.io/developer/950919208) |

## What reviewers say

### ReadDi E

[App page](https://appshunter.io/ios/app/readdi-e-library/id1603809674)

**Features:** macOS Compatibility

**In-app purchases:** none


### COJ Library

[App page](https://appshunter.io/ios/app/coj-library/id6447178622)

**In-app purchases:** none


## Frequently asked questions

### Is ReadDi E free?

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

### Is COJ Library free?

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

### Do ReadDi E or COJ Library have ads?

Neither ReadDi E nor COJ Library shows ads.

### Which is updated more often, ReadDi E or COJ Library?

ReadDi E ships an update every 8 months, and COJ Library fortnightly. Most recently, ReadDi E was updated on September 17, 2026 and COJ Library on September 12, 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.*