# ClearKey Calc vs Gradation Calculator

The clearest difference is device support: ClearKey Calc at 3 against Gradation Calculator's 1. ClearKey Calc also leads on iOS requirement (15.1 vs 18.2). 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 | ClearKey Calc | Gradation Calculator |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Size | 30 MB | 6 MB |
| Requires iOS | **15.1** | 18.2 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 12+ |
| Developer | [鹏飞 陈](https://appshunter.io/developer/1891216752) | [MASATO MISAWA](https://appshunter.io/developer/1609449895) |

## 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


### Gradation Calculator

[App page](https://appshunter.io/ios/app/gradation-calculator/id6777311428)

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

**In-app purchases:** none


## Frequently asked questions

### Is ClearKey Calc free?

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

### Is Gradation Calculator free?

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

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

Neither ClearKey Calc nor Gradation Calculator 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.*