# SafetyEngine vs OptiUnit Lite

The clearest difference is iOS requirement: OptiUnit Lite at 13.0 against SafetyEngine's 15.6. On price, update cadence, 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.

SafetyEngine ships an update every 3 weeks, OptiUnit Lite every 2 weeks. The most recent releases landed on October 20, 2026 and October 22, 2026 respectively.

## The numbers

| Metric | SafetyEngine | OptiUnit Lite |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 2 weeks** |
| Size | 254 MB | 37 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Ramboll A/S](https://appshunter.io/developer/1522256210) | [OptiUnit ApS](https://appshunter.io/developer/1529437877) |

## What reviewers say

### SafetyEngine

[App page](https://appshunter.io/ios/app/safetyengine/id1598288000)

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

**In-app purchases:** none


### OptiUnit Lite

[App page](https://appshunter.io/ios/app/optiunit-lite/id6473189811)

**In-app purchases:** none


## Frequently asked questions

### Is SafetyEngine free?

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

### Is OptiUnit Lite free?

OptiUnit Lite is free to download, with no in-app purchases.

### Do SafetyEngine or OptiUnit Lite have ads?

Neither SafetyEngine nor OptiUnit Lite shows ads.

### Which is updated more often, SafetyEngine or OptiUnit Lite?

SafetyEngine ships an update every 3 weeks, and OptiUnit Lite every 2 weeks. Most recently, SafetyEngine was updated on October 20, 2026 and OptiUnit Lite on October 22, 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.*