# Bookii vs Book Brain

The clearest difference is in-app purchases: Book Brain at none against Bookii's 10. Bookii's advantage is ads (none vs shown) and update cadence (fortnightly vs every 5 weeks). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Bookii sells 9 one-off in-app purchases. Book Brain asks for nothing beyond the download.

Bookii ships an update fortnightly, Book Brain every 5 weeks. The most recent releases landed on October 18, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | Bookii | Book Brain |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | **Fortnightly** | Every 5 weeks |
| Size | 57 MB | 64 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Hoang Thuong Vu](https://appshunter.io/developer/1709848945) | [Nguyen Minh Duc](https://appshunter.io/developer/6779044112) |

## What reviewers say

### Bookii

[App page](https://appshunter.io/ios/app/bookii/id6468387653)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 25 coins | $0.29 | one-time |
| 20 coins | $0.29 | one-time |
| 50 coins | $0.49 | one-time |
| 100 coins | $0.99 | one-time |
| 200 coins | $1.99 | one-time |
| 300 coins | $2.99 | one-time |
| 500 coins | $4.99 | one-time |
| 700 coins | $6.99 | one-time |
| 1000 coins | $9.99 | one-time |


### Book Brain

[App page](https://appshunter.io/ios/app/book-brain/id6779572538)

**In-app purchases:** none


## Frequently asked questions

### Is Bookii free?

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

### Is Book Brain free?

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

### Do Bookii or Book Brain have ads?

Book Brain shows ads; Bookii does not.

### Which is updated more often, Bookii or Book Brain?

Bookii ships an update fortnightly, and Book Brain every 5 weeks. Most recently, Bookii was updated on October 18, 2026 and Book Brain on October 14, 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.*