# ZX81 vs Danger Fish

The clearest difference is ads: ZX81 at none against Danger Fish's shown. ZX81 also leads on device support (4 vs 1) and iOS requirement (15.0 vs 18.6). Danger Fish's advantage is update cadence (every 4 days vs every 10 days). On price and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ZX81 ships an update every 10 days, Danger Fish every 4 days. The most recent releases landed on October 26, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | ZX81 | Danger Fish |
| --- | --- | --- |
| Price | Free | Free |
| 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** | Yes |
| Update frequency | Every 10 days | **Every 4 days** |
| Monetization | Free | — |
| Size | 86 MB | 24 MB |
| Requires iOS | **15.0** | 18.6 |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone |
| Age rating | 9+ | 4+ |
| Developer | [Kevin Palser](https://appshunter.io/developer/1180117433) | [Robert Macrae](https://appshunter.io/developer/6793521392) |

## What reviewers say

### ZX81

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

Experience early 1980s home computing with this app dedicated to the Sinclair ZX80 and ZX81. It includes a wealth of example software, offering a nostalgic journey into the origins of personal computing.

**Highlights:** Sinclair ZX80/ZX81 emulation, Timex Sinclair 1000 support, Includes example software, Focuses on early 1980s computing, ROM code included with permission

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

**In-app purchases:** none


### Danger Fish

[App page](https://appshunter.io/ios/app/danger-fish/id6793887620)

**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 Danger Fish free?

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

### Do ZX81 or Danger Fish have ads?

Danger Fish shows ads; ZX81 does not.

### Which is updated more often, ZX81 or Danger Fish?

ZX81 ships an update every 10 days, and Danger Fish every 4 days. Most recently, ZX81 was updated on October 26, 2026 and Danger Fish 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.*