# BookBook vs KRIZ

The clearest difference is in-app purchases: KRIZ at none against BookBook's 2. KRIZ also leads on iOS requirement (15.1 vs 18.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. BookBook sells 2 in-app purchases, starting at $3.99 per month. KRIZ asks for nothing beyond the download.

BookBook ships an update every 3 weeks, KRIZ fortnightly. The most recent releases landed on October 14, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | BookBook | KRIZ |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Fortnightly** |
| Size | 48 MB | 46 MB |
| Requires iOS | 18.0 | **15.1** |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [UZEYIR GULAC](https://appshunter.io/developer/6777392134) | [Kateryna Dimitrashko](https://appshunter.io/developer/6797778450) |

## What reviewers say

### BookBook

[App page](https://appshunter.io/ios/app/bookbook-reading-tracker/id6787627083)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| BookBook Premium – Monthly | $3.99 | per month |
| BookBook Premium - Yearly | $29.99 | per year |


### KRIZ

[App page](https://appshunter.io/ios/app/kriz-reading-diary/id6797778448)

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

**In-app purchases:** none


## Frequently asked questions

### Is BookBook free?

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

### Is KRIZ free?

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

### Do BookBook or KRIZ have ads?

Neither BookBook nor KRIZ shows ads.

### Which is updated more often, BookBook or KRIZ?

BookBook ships an update every 3 weeks, and KRIZ fortnightly. Most recently, BookBook was updated on October 14, 2026 and KRIZ on October 4, 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.*