# Müller vs MoonScope

The clearest difference is in-app purchases: Müller at none against MoonScope's 1. Müller also leads on iOS requirement (12.0 vs 16.0). MoonScope's advantage is update cadence (monthly vs every 9 months). On price, ads and device support there is nothing between them.

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

Müller ships an update every 9 months, MoonScope monthly. The most recent releases landed on October 27, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Müller | MoonScope |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 9 months | **Monthly** |
| Size | 30 MB | 161 MB |
| Requires iOS | **12.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [SOCIA LABO, K.K.](https://appshunter.io/developer/1688326248) | [Hajime Suzuki](https://appshunter.io/developer/1615906018) |

## What reviewers say

### Müller

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

**Features:** macOS Compatibility

**In-app purchases:** none


### MoonScope

[App page](https://appshunter.io/ios/app/moonscope/id6747671746)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| No Ads | $4.99 | one-time |


## Frequently asked questions

### Is Müller free?

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

### Is MoonScope free?

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

### Do Müller or MoonScope have ads?

Both Müller and MoonScope show ads.

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

Müller ships an update every 9 months, and MoonScope monthly. Most recently, Müller was updated on October 27, 2026 and MoonScope on October 25, 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.*