# Engineering Converter vs iUnits Converter

The clearest difference is ads: iUnits Converter at none against Engineering Converter's shown. iUnits Converter also leads on update cadence (every 6 days vs every 42 months). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Engineering Converter ships an update every 42 months, iUnits Converter every 6 days. The most recent releases landed on September 30, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Engineering Converter | iUnits Converter |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 42 months | **Every 6 days** |
| Size | 6 MB | 6 MB |
| Requires iOS | 15.0 | **14.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Brook Wallace](https://appshunter.io/developer/1234097174) | [Alessandro Manilii](https://appshunter.io/developer/743902887) |

## What reviewers say

### Engineering Converter

[App page](https://appshunter.io/ios/app/engineering-converter/id1234097175)

**Features:** macOS Compatibility

**In-app purchases:** none


### iUnits Converter

[App page](https://appshunter.io/ios/app/iunits-converter/id1535769643)

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

**In-app purchases:** none


## Frequently asked questions

### Is Engineering Converter free?

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

### Is iUnits Converter free?

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

### Do Engineering Converter or iUnits Converter have ads?

Engineering Converter shows ads; iUnits Converter does not.

### Which is updated more often, Engineering Converter or iUnits Converter?

Engineering Converter ships an update every 42 months, and iUnits Converter every 6 days. Most recently, Engineering Converter was updated on September 30, 2026 and iUnits Converter on October 8, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*