# Prime Unit Converter vs Unit Converter Engineering Pro

The clearest difference is in-app purchases: Prime Unit Converter at none against Unit Converter Engineering Pro's 2. Unit Converter Engineering Pro's advantage is iOS requirement (13.0 vs 16.6). On price, ads and device support there is nothing between them.

Both are free to download. Unit Converter Engineering Pro sells 2 in-app purchases, starting at $5.99 per 7 days. Prime Unit Converter asks for nothing beyond the download.

## The numbers

| Metric | Prime Unit Converter | Unit Converter Engineering Pro |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/unit-converter-engineering-pro/id6757166485/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | — | Weekly |
| Monetization | — | Free with in-app purchases |
| Size | 1 MB | 77 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) | [Kaiguri Tech](https://appshunter.io/developer/1864995084) |

## 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


### Unit Converter Engineering Pro

[App page](https://appshunter.io/ios/app/unit-converter-engineering-pro/id6757166485)

This app provides precise unit conversions for engineers, scientists, and students. It supports over 100 units across 35 categories, including scientific notation and 9-digit decimal precision. The tool works offline and adheres to SI, NIST, and ISO standards.

**Highlights:** Over 100 units in 35+ categories, Scientific notation support, 9-digit decimal precision, SI, NIST, ISO compliant, Offline functionality, Specialized units included

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 3-Day Trial | $5.99 | per 7 days |
| Yearly Plan | $19.99 | per year |


## Frequently asked questions

### Is Prime Unit Converter free?

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

### Is Unit Converter Engineering Pro free?

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

### Do Prime Unit Converter or Unit Converter Engineering Pro have ads?

Neither Prime Unit Converter nor Unit Converter Engineering 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.*