# KemoDoku vs Protocol 4

The clearest difference is price: Protocol 4 at Free against KemoDoku's $0.99. KemoDoku's advantage is in-app purchases (none vs 7) and ads (none vs shown). On device support and iOS requirement there is nothing between them.

Protocol 4 is free to download; KemoDoku costs $0.99 up front. Protocol 4 sells 7 one-off in-app purchases. KemoDoku asks for nothing beyond the download.

KemoDoku ships an update every 2 days, Protocol 4 every 3 months. The most recent releases landed on October 24, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | KemoDoku | Protocol 4 |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | **[4.5 (2 ratings)](https://appshunter.io/ios/app/kemodoku/id6752019675/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 2 days** | Every 3 months |
| Monetization | Paid | — |
| Size | 14 MB | 12 MB |
| Requires iOS | **16.6** | 17.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Martin Hanske](https://appshunter.io/developer/1716050508) | [HAKAN OZGER](https://appshunter.io/developer/1855495033) |

## What reviewers say

### KemoDoku

[App page](https://appshunter.io/ios/app/kemodoku/id6752019675)

This logic game offers a charming twist on classic Sudoku, replacing numbers with adorable animal icons. It provides a variety of difficulty levels and modes suitable for both beginners and experienced players, all playable offline. Enjoy hours of engaging brain training with delightful animal graphics.

**Highlights:** Classic and animal icon Sudoku, Multiple difficulty levels, Offline play support, Beautiful animal graphics, Brain training and logic development

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

**In-app purchases:** none


### Protocol 4

[App page](https://appshunter.io/ios/app/protocol-4-code-breaker-pvp/id6755742805)

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

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pocket Change | $0.99 | one-time |
| Starter Kit | $1.99 | one-time |
| Agent License | $2.99 | one-time |
| Hacker's Stash | $4.99 | one-time |
| Pro Kit | $4.99 | one-time |
| Trust Fund | $9.99 | one-time |
| Master Kit | $9.99 | one-time |


## Frequently asked questions

### Is KemoDoku free?

KemoDoku costs $0.99, with no in-app purchases.

### Is Protocol 4 free?

Protocol 4 is free to download, with in-app purchases available.

### Do KemoDoku or Protocol 4 have ads?

Protocol 4 shows ads; KemoDoku does not.

### Which is updated more often, KemoDoku or Protocol 4?

KemoDoku ships an update every 2 days, and Protocol 4 every 3 months. Most recently, KemoDoku was updated on October 24, 2026 and Protocol 4 on October 8, 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.*