# Protocol 4 vs Mayor 4000

The clearest difference is in-app purchases: Mayor 4000 at none against Protocol 4's 7. Mayor 4000 also leads on ads (none vs shown) and update cadence (every 3 days vs every 3 months). On price and device support there is nothing between them.

Both are free to download. Protocol 4 sells 7 one-off in-app purchases. Mayor 4000 asks for nothing beyond the download.

Protocol 4 ships an update every 3 months, Mayor 4000 every 3 days. The most recent releases landed on October 8, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Protocol 4 | Mayor 4000 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.8 (50 ratings)](https://appshunter.io/ios/app/mayor-4000-city-builder/id6782534123/reviews)** |
| Number of ratings | — | **50** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 3 months | **Every 3 days** |
| Monetization | — | Free with in-app purchases |
| Size | 12 MB | 460 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 9+ |
| Developer | [HAKAN OZGER](https://appshunter.io/developer/1855495033) | [婉媚 邵](https://appshunter.io/developer/1297240696) |

## What reviewers say

### 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 |


### Mayor 4000

[App page](https://appshunter.io/ios/app/mayor-4000-city-builder/id6782534123)

Build, zone, and manage your dream city from a small town to a thriving metropolis. Simulate citizens, jobs, and traffic, and balance the books while surviving disasters. Enjoy deep, offline-friendly gameplay with no timers or resource grinding.

**Highlights:** Zone and grow residential, commercial, and industrial areas, Build essential infrastructure like roads and utilities, Manage city services such as police and schools, Balance the economy with taxes and ordinances, Survive and rebuild from natural disasters, Deep offline-friendly sandbox gameplay

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

**In-app purchases:** none


## Frequently asked questions

### Is Protocol 4 free?

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

### Is Mayor 4000 free?

Mayor 4000 is free to download, with no in-app purchases.

### Do Protocol 4 or Mayor 4000 have ads?

Protocol 4 shows ads; Mayor 4000 does not.

### Which is updated more often, Protocol 4 or Mayor 4000?

Protocol 4 ships an update every 3 months, and Mayor 4000 every 3 days. Most recently, Protocol 4 was updated on October 8, 2026 and Mayor 4000 on October 31, 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.*