# Müller vs ZeroZip

The clearest difference is in-app purchases: Müller at none against ZeroZip's 1. ZeroZip's advantage is ads (none vs shown) and update cadence (every 2 months vs every 9 months). On price, device support and iOS requirement there is nothing between them.

Both are free to download. ZeroZip sells 1 one-off in-app purchase. Müller asks for nothing beyond the download.

Müller ships an update every 9 months, ZeroZip every 2 months. The most recent releases landed on October 27, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Müller | ZeroZip |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 9 months | **Every 2 months** |
| Size | 30 MB | 28 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [SOCIA LABO, K.K.](https://appshunter.io/developer/1688326248) | [genghong Xie](https://appshunter.io/developer/1785558382) |

## What reviewers say

### Müller

[App page](https://appshunter.io/ios/app/muller-lyer-illusion-app/id6450165949)

**Features:** macOS Compatibility

**In-app purchases:** none


### ZeroZip

[App page](https://appshunter.io/ios/app/zerozip/id6755241805)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Ad-Free | $1.99 | one-time |


## Frequently asked questions

### Is Müller free?

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

### Is ZeroZip free?

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

### Do Müller or ZeroZip have ads?

Müller shows ads; ZeroZip does not.

### Which is updated more often, Müller or ZeroZip?

Müller ships an update every 9 months, and ZeroZip every 2 months. Most recently, Müller was updated on October 27, 2026 and ZeroZip on October 24, 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.*