# CodeAB vs Protocol 4

The clearest difference is ads: CodeAB at none against Protocol 4's shown. CodeAB also leads on update cadence (every 6 weeks vs every 4 months). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. CodeAB sells 1 one-off in-app purchase and Protocol 4 sells 7 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

CodeAB ships an update every 6 weeks, Protocol 4 every 4 months. The most recent releases landed on September 17, 2026 and September 6, 2026 respectively.

## The numbers

| Metric | CodeAB | Protocol 4 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/codeab-logic-number-puzzle/id1616021619/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 6 weeks** | Every 4 months |
| Monetization | Free | — |
| Size | 3 MB | 12 MB |
| Requires iOS | 17.6 | **17.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [EssentialCapture Inc](https://appshunter.io/developer/1558967478) | [HAKAN OZGER](https://appshunter.io/developer/1855495033) |

## What reviewers say

### CodeAB

[App page](https://appshunter.io/ios/app/codeab-logic-number-puzzle/id1616021619)

Test your logic and deduction skills in this addictive number puzzle game. Figure out the secret 4-digit code using hints after each guess. It's a fresh take on a classic puzzle, perfect for quick brain training.

**Highlights:** Deduction and logic gameplay, Secret 4-digit code challenge, Clues after every guess, No leading zeros or repeating digits, Quick brain training rounds, Classic Bulls & Cows style

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| CodeAB | $2.99 | 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 CodeAB free?

CodeAB 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 CodeAB or Protocol 4 have ads?

Protocol 4 shows ads; CodeAB does not.

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

CodeAB ships an update every 6 weeks, and Protocol 4 every 4 months. Most recently, CodeAB was updated on September 17, 2026 and Protocol 4 on September 6, 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.*