# Prime Unit Converter vs SafeKey

The clearest difference is price: Prime Unit Converter at Free against SafeKey's $0.99. SafeKey's advantage is iOS requirement (13.0 vs 16.6). On ads, in-app purchases and device support there is nothing between them.

Prime Unit Converter is free to download; SafeKey costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | Prime Unit Converter | SafeKey |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | — | Weekly |
| Size | 1 MB | 22 MB |
| Requires iOS | 16.6 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Nirav Parmar](https://appshunter.io/developer/1596410760) | [昌奇 尹](https://appshunter.io/developer/1525046260) |

## What reviewers say

### Prime Unit Converter

[App page](https://appshunter.io/ios/app/prime-unit-converter/id6742789692)

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

**In-app purchases:** none


### SafeKey

[App page](https://appshunter.io/ios/app/safekey-password-manager/id6760553300)

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

**In-app purchases:** none


## Frequently asked questions

### Is Prime Unit Converter free?

Prime Unit Converter is free to download, with no in-app purchases.

### Is SafeKey free?

SafeKey costs $0.99, with no in-app purchases.

### Do Prime Unit Converter or SafeKey have ads?

Neither Prime Unit Converter nor SafeKey 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.*