# 熊本かるたっと mini vs Optical Illusion Book

The clearest difference is in-app purchases: 熊本かるたっと mini at none against Optical Illusion Book's 1. 熊本かるたっと mini also leads on iOS requirement (15.6 vs 18.0). On price, ads and device support there is nothing between them.

Both are free to download. Optical Illusion Book sells 1 one-off in-app purchase. 熊本かるたっと mini asks for nothing beyond the download.

## The numbers

| Metric | 熊本かるたっと mini | Optical Illusion Book |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 weeks | — |
| Size | 158 MB | 4 MB |
| Requires iOS | **15.6** | 18.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Ichiro Iimura](https://appshunter.io/developer/1261291628) | [Mishima Design](https://appshunter.io/developer/373060551) |

## What reviewers say

### 熊本かるたっと mini

[App page](https://appshunter.io/ios/app/mini/id6739420659)

**Features:** macOS Compatibility

**In-app purchases:** none


### Optical Illusion Book

[App page](https://appshunter.io/ios/app/optical-illusion-book/id6801408868)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Complete Collection | $14.99 | one-time |


## Frequently asked questions

### Is 熊本かるたっと mini free?

熊本かるたっと mini is free to download, with no in-app purchases.

### Is Optical Illusion Book free?

Optical Illusion Book is free to download, with in-app purchases available.

### Do 熊本かるたっと mini or Optical Illusion Book have ads?

Neither 熊本かるたっと mini nor Optical Illusion Book shows ads.

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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.*