# World Button vs Rot & Ferment

The clearest difference is in-app purchases: World Button at none against Rot & Ferment's 5. Rot & Ferment's advantage is update cadence (every 2 days vs every 4 days). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Rot & Ferment sells 5 one-off in-app purchases. World Button asks for nothing beyond the download.

World Button ships an update every 4 days, Rot & Ferment every 2 days. The most recent releases landed on September 19, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | World Button | Rot & Ferment |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 4 days | **Every 2 days** |
| Size | 220 MB | 154 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Celestial Pug LLC](https://appshunter.io/developer/1615114330) | [Nils Rohwer](https://appshunter.io/developer/6777538815) |

## What reviewers say

### World Button

[App page](https://appshunter.io/ios/app/world-button/id6742792580)

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

**In-app purchases:** none


### Rot & Ferment

[App page](https://appshunter.io/ios/app/rot-and-ferment/id6800438731)

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Time skip | $0.99 | one-time |
| Hire a trusted carter | $0.99 | one-time |
| Buy a crock | $1.99 | one-time |
| Remove ads | $2.99 | one-time |
| Permanent x2 income | $4.99 | one-time |


## Frequently asked questions

### Is World Button free?

World Button is free to download, with no in-app purchases.

### Is Rot & Ferment free?

Rot & Ferment is free to download, with in-app purchases available.

### Do World Button or Rot & Ferment have ads?

Both World Button and Rot & Ferment show ads.

### Which is updated more often, World Button or Rot & Ferment?

World Button ships an update every 4 days, and Rot & Ferment every 2 days. Most recently, World Button was updated on September 19, 2026 and Rot & Ferment on September 17, 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.*