# ClearKey Calc vs Calculator Ultra

The clearest difference is iOS requirement: ClearKey Calc at 15.1 against Calculator Ultra's 17.0. On price, ads, in-app purchases and device support 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 | ClearKey Calc | Calculator Ultra |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Size | 30 MB | 4 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [鹏飞 陈](https://appshunter.io/developer/1891216752) | [phakin chatngamapichat](https://appshunter.io/developer/6792130022) |

## What reviewers say

### ClearKey Calc

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

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

**In-app purchases:** none


### Calculator Ultra

[App page](https://appshunter.io/ios/app/calculator-ultra-smart-math/id6792903428)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is ClearKey Calc free?

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

### Is Calculator Ultra free?

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

### Do ClearKey Calc or Calculator Ultra have ads?

Neither ClearKey Calc nor Calculator Ultra 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.*