# COJ Library vs BookPro Reader

The clearest difference is update cadence: COJ Library at fortnightly against BookPro Reader's every 31 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.

COJ Library ships an update fortnightly, BookPro Reader every 31 months. Both last shipped on November 7, 2026.

## The numbers

| Metric | COJ Library | BookPro Reader |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 31 months |
| Size | 30 MB | 20 MB |
| Requires iOS | **10.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 12+ |
| Developer | [Loxley Orbit Public Company Limited](https://appshunter.io/developer/950919208) | [Prajuab Sahaporn-udomgarn](https://appshunter.io/developer/1597075593) |

## What reviewers say

### COJ Library

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

**In-app purchases:** none


### BookPro Reader

[App page](https://appshunter.io/ios/app/bookpro-reader/id6450408133)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is COJ Library free?

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

### Is BookPro Reader free?

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

### Do COJ Library or BookPro Reader have ads?

Neither COJ Library nor BookPro Reader shows ads.

### Which is updated more often, COJ Library or BookPro Reader?

COJ Library ships an update fortnightly, and BookPro Reader every 31 months. Most recently, COJ Library was updated on November 7, 2026 and BookPro Reader on November 7, 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.*