# Key Calculator vs CalcKing Pro

The clearest difference is in-app purchases: Key Calculator at none against CalcKing Pro's 1. Key Calculator also leads on iOS requirement (12.0 vs 15.0). On price, ads and device support there is nothing between them.

Both are free to download. CalcKing Pro sells 1 one-off in-app purchase. Key Calculator asks for nothing beyond the download.

## The numbers

| Metric | Key Calculator | CalcKing Pro |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | — | Weekly |
| Size | 27 MB | 2 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [瑞勤 李](https://appshunter.io/developer/1401713785) | [文娟 唐](https://appshunter.io/developer/1870722016) |

## What reviewers say

### Key Calculator

[App page](https://appshunter.io/ios/app/key-calculator/id6740821637)

**Features:** macOS Compatibility

**In-app purchases:** none


### CalcKing Pro

[App page](https://appshunter.io/ios/app/calcking-pro-professional/id6758431895)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 解锁功能 | $3.99 | one-time |


## Frequently asked questions

### Is Key Calculator free?

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

### Is CalcKing Pro free?

CalcKing Pro is free to download, with in-app purchases available.

### Do Key Calculator or CalcKing Pro have ads?

Neither Key Calculator nor CalcKing Pro 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.*