# ZX81 vs Mu

The clearest difference is price: ZX81 at Free against Mu's $5.99. ZX81 also leads on device support (4 vs 2). Mu's advantage is iOS requirement (12.0.0 vs 15.0). On ads and in-app purchases there is nothing between them.

ZX81 is free to download; Mu costs $5.99 up front. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | ZX81 | Mu |
| --- | --- | --- |
| Price | **Free** | $5.99 |
| Rating | **[4.9 (92 ratings)](https://appshunter.io/ios/app/zx81/id1180117434/reviews)** | — |
| Number of ratings | **92** | — |
| Positive reviews | 98.4% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 10 days | — |
| Monetization | Free | — |
| Size | 90 MB | 24 MB |
| Requires iOS | 15.0 | **12.0.0** |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, iPod |
| Age rating | 9+ | 12+ |
| Developer | [Kevin Palser](https://appshunter.io/developer/1180117433) | [Thaw Soe](https://appshunter.io/developer/1546485238) |

## What reviewers say

### ZX81

[App page](https://appshunter.io/ios/app/zx81/id1180117434)

Experience early 1980s home computing with this app, focusing on the Sinclair ZX81. It includes example software and syncs sessions between your iPhone and Apple Watch.

**Highlights:** Sinclair ZX80/ZX81 emulation, Timex Sinclair 1000/1500 emulation, Includes example software, watchOS app included, Session syncing between devices

**Features:** macOS Compatibility, Game Controller support, Apple Watch app, Vision Pro support, iPhone Duo support

**In-app purchases:** none


### Mu

[App page](https://appshunter.io/ios/app/mu-multi-system-emulator/id6744273029)

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

**In-app purchases:** none


## Frequently asked questions

### Is ZX81 free?

ZX81 is free to download, with no in-app purchases.

### Is Mu free?

Mu costs $5.99, with no in-app purchases.

### Do ZX81 or Mu have ads?

Neither ZX81 nor Mu shows ads.

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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.*