# EyeSight Challenge vs Protocol 4

The clearest difference is ads: EyeSight Challenge at none against Protocol 4's shown. EyeSight Challenge also leads on iOS requirement (15 vs 17.0). Protocol 4's advantage is update cadence (every 3 months vs every 24 months). On price, in-app purchases and device support there is nothing between them.

Both are free to download. EyeSight Challenge sells 3 in-app purchases, starting at $2.99 per month and Protocol 4 sells 7 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

EyeSight Challenge ships an update every 24 months, Protocol 4 every 3 months. The most recent releases landed on October 26, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | EyeSight Challenge | Protocol 4 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/eyesight-challenge-focus-game/id1045892052/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 24 months | **Every 3 months** |
| Monetization | Free | — |
| Size | 34 MB | 12 MB |
| Requires iOS | **15** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Nitin Gohel](https://appshunter.io/developer/363532420) | [HAKAN OZGER](https://appshunter.io/developer/1855495033) |

## What reviewers say

### EyeSight Challenge

[App page](https://appshunter.io/ios/app/eyesight-challenge-focus-game/id1045892052)

This brain training app focuses on improving visual skills through a variety of engaging games. It offers exercises for color perception, reaction time, eye movement, and memory, with progress tracking and achievements to motivate users.

**Highlights:** Color blind tests, Reaction speed training, Eye movement exercises, Pattern memory challenges, Progress tracking, Daily challenges and streaks

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Subscription Plan | $2.99 | per month |
| Remove Ads Plan | $3.99 | one-time |
| Lifetime Plan | $19.99 | one-time |


### 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 EyeSight Challenge free?

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

### Is Protocol 4 free?

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

### Do EyeSight Challenge or Protocol 4 have ads?

Protocol 4 shows ads; EyeSight Challenge does not.

### Which is updated more often, EyeSight Challenge or Protocol 4?

EyeSight Challenge ships an update every 24 months, and Protocol 4 every 3 months. Most recently, EyeSight Challenge was updated on October 26, 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.*