# Unit Converter For Engineers vs BoltSpec Pro

The clearest difference is price: Unit Converter For Engineers at Free against BoltSpec Pro's $1.99. BoltSpec Pro's advantage is in-app purchases (none vs 2). On ads, device support and iOS requirement there is nothing between them.

Unit Converter For Engineers is free to download; BoltSpec Pro costs $1.99 up front. Unit Converter For Engineers sells 2 in-app purchases, starting at $9.99 per year. BoltSpec Pro asks for nothing beyond the download.

## The numbers

| Metric | Unit Converter For Engineers | BoltSpec Pro |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/unit-converter-for-engineers/id6752224915/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 9 days | — |
| Monetization | Freemium | — |
| Size | 5 MB | 2 MB |
| Requires iOS | **16.2** | 17.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [Amanuel Abebaw](https://appshunter.io/developer/1766393564) | [Qixin Net (Beijing) Technology Co., Ltd.](https://appshunter.io/developer/1886626064) |

## What reviewers say

### Unit Converter For Engineers

[App page](https://appshunter.io/ios/app/unit-converter-for-engineers/id6752224915)

This app provides a comprehensive unit conversion tool specifically designed for engineers, offering specialized units not found in standard converters. It features offline functionality, fast search, and a clean interface, replacing the need for multiple reference materials.

**Highlights:** Specialized engineering units, Offline functionality, Fast search and instant conversion, Fraction input mode, Ad-free interface, Scientific notation support

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Annual Subscription | $9.99 | per year |
| Lifetime Access | $29.99 | one-time |


### BoltSpec Pro

[App page](https://appshunter.io/ios/app/boltspec-pro/id6762735091)

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

**In-app purchases:** none


## Frequently asked questions

### Is Unit Converter For Engineers free?

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

### Is BoltSpec Pro free?

BoltSpec Pro costs $1.99, with no in-app purchases.

### Do Unit Converter For Engineers or BoltSpec Pro have ads?

Neither Unit Converter For Engineers nor BoltSpec 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.*