# SafeKey Mobile vs Unit Converter

The clearest difference is in-app purchases: SafeKey Mobile at none against Unit Converter's 2. Unit Converter's advantage is update cadence (every 2 weeks vs every 5 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Unit Converter sells 2 in-app purchases, starting at $2.49 per month. SafeKey Mobile asks for nothing beyond the download.

SafeKey Mobile ships an update every 5 months, Unit Converter every 2 weeks. The most recent releases landed on November 8, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | SafeKey Mobile | Unit Converter |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 2 weeks** |
| Size | 38 MB | 49 MB |
| Requires iOS | 15.5 | **15.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [SAFETECH](https://appshunter.io/developer/1471425229) | [Petrichka Yaroslav](https://appshunter.io/developer/1032980882) |

## What reviewers say

### SafeKey Mobile

[App page](https://appshunter.io/ios/app/safekey-mobile/id6479244282)

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

**In-app purchases:** none


### Unit Converter

[App page](https://appshunter.io/ios/app/unit-converter-univerter/id6738687525)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Monthly | $2.49 | per month |
| Yearly Premium | $14.99 | per year |


## Frequently asked questions

### Is SafeKey Mobile free?

SafeKey Mobile is free to download, with no in-app purchases.

### Is Unit Converter free?

Unit Converter is free to download, with in-app purchases available.

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

Neither SafeKey Mobile nor Unit Converter shows ads.

### Which is updated more often, SafeKey Mobile or Unit Converter?

SafeKey Mobile ships an update every 5 months, and Unit Converter every 2 weeks. Most recently, SafeKey Mobile was updated on November 8, 2026 and Unit Converter on October 30, 2026.

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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.*