# ZX81 vs CRJ Checklists

The clearest difference is price: ZX81 at Free against CRJ Checklists's $0.99. ZX81 also leads on update cadence (every 10 days vs every 2 months) and device support (4 vs 2). On ads and in-app purchases there is nothing between them.

ZX81 is free to download; CRJ Checklists costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ZX81 ships an update every 10 days, CRJ Checklists every 2 months. Both last shipped on November 2, 2026.

## The numbers

| Metric | ZX81 | CRJ Checklists |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| 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** | Every 2 months |
| Monetization | Free | — |
| Size | 86 MB | 3 MB |
| Requires iOS | **15.0** | 17.5 |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, iPad |
| Age rating | 9+ | 4+ |
| Developer | [Kevin Palser](https://appshunter.io/developer/1180117433) | [Lukasz Musial](https://appshunter.io/developer/670046692) |

## 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


### CRJ Checklists

[App page](https://appshunter.io/ios/app/crj-checklists/id1350762953)

**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 CRJ Checklists free?

CRJ Checklists costs $0.99, with no in-app purchases.

### Do ZX81 or CRJ Checklists have ads?

Neither ZX81 nor CRJ Checklists shows ads.

### Which is updated more often, ZX81 or CRJ Checklists?

ZX81 ships an update every 10 days, and CRJ Checklists every 2 months. Most recently, ZX81 was updated on November 2, 2026 and CRJ Checklists on November 2, 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.*