# Dark Digits vs ClearKey Calc

The clearest difference is device support: ClearKey Calc at 3 against Dark Digits's 1. ClearKey Calc also leads on iOS requirement (15.1 vs 17.6). On price, ads 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.

## The numbers

| Metric | Dark Digits | ClearKey Calc |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | — |
| Size | 4 MB | 30 MB |
| Requires iOS | 17.6 | **15.1** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [YMMV](https://appshunter.io/developer/1224453829) | [鹏飞 陈](https://appshunter.io/developer/1891216752) |

## What reviewers say

### Dark Digits

[App page](https://appshunter.io/ios/app/dark-digits/id6744330793)

**Features:** macOS Compatibility

**In-app purchases:** none


### ClearKey Calc

[App page](https://appshunter.io/ios/app/clearkey-calc/id6761746376)

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

**In-app purchases:** none


## Frequently asked questions

### Is Dark Digits free?

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

### Is ClearKey Calc free?

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

### Do Dark Digits or ClearKey Calc have ads?

Neither Dark Digits nor ClearKey Calc 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.*