# Catdoku vs Image Brain

The clearest difference is update cadence: Catdoku at every 3 weeks against Image Brain's every 7 months. Catdoku also leads on chart position (#196 vs unranked) and price ($1.99 vs $2.99). Image Brain's advantage is iOS requirement (11.0 vs 16.6). On ads, in-app purchases and device support there is nothing between them.

Catdoku costs $1.99 and Image Brain $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Catdoku ships an update every 3 weeks, Image Brain every 7 months. Both last shipped on October 27, 2026.

## The numbers

| Metric | Catdoku | Image Brain |
| --- | --- | --- |
| Price | **$1.99** | $2.99 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 7 months |
| Monetization | Paid | — |
| Best chart rank | **#196** | — |
| Size | 55 MB | 12 MB |
| Requires iOS | 16.6 | **11.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Sergio Marin](https://appshunter.io/developer/1731012600) | [Hamster Force Multimedia Ltd.](https://appshunter.io/developer/443416476) |

## What reviewers say

### Catdoku

[App page](https://appshunter.io/ios/app/catdoku/id6477891720)

**Currently charting:** #196 Top Paid · Casual (US App Store)

This puzzle game reimagines Sudoku by replacing numbers with cute cats. It offers various grid sizes and daily challenges to keep players engaged. Enjoy a relaxing yet mentally stimulating experience with a feline twist.

**Highlights:** Cat-themed Sudoku gameplay, Multiple grid sizes (4x4, 6x6, 9x9), Daily puzzle challenges, Suitable for beginners and pros, Relaxing and mentally stimulating

**Features:** macOS Compatibility

**In-app purchases:** none


### Image Brain

[App page](https://appshunter.io/ios/app/image-brain/id6479590387)

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

**In-app purchases:** none


## Frequently asked questions

### Is Catdoku free?

Catdoku costs $1.99, with no in-app purchases.

### Is Image Brain free?

Image Brain costs $2.99, with no in-app purchases.

### Do Catdoku or Image Brain have ads?

Neither Catdoku nor Image Brain shows ads.

### Which is updated more often, Catdoku or Image Brain?

Catdoku ships an update every 3 weeks, and Image Brain every 7 months. Most recently, Catdoku was updated on October 27, 2026 and Image Brain on October 27, 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.*