# Units Converter for Engineers vs Conversion Calculator Plus

The clearest difference is rating: Conversion Calculator Plus at 4.7 against Units Converter for Engineers's 3.0. Conversion Calculator Plus also leads on update cadence (every 6 days vs every 5 weeks) and ratings volume (15K vs 2). Units Converter for Engineers's advantage is ads (none vs shown). On price, in-app purchases, monetization model and device support there is nothing between them.

Both are free to download. Units Converter for Engineers sells 2 one-off in-app purchases and Conversion Calculator Plus sells 1 in-app purchase, starting at $9.99 per year. Whichever you choose, the download price is not the number that matters.

Conversion Calculator Plus holds the better App Store score, 4.7 against 3.0. That said, the two scores are not equally well evidenced: Conversion Calculator Plus has 15K ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 50% of Units Converter for Engineers's written reviews are positive against 69% of Conversion Calculator Plus's.

Units Converter for Engineers ships an update every 5 weeks, Conversion Calculator Plus every 6 days. The most recent releases landed on September 19, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | Units Converter for Engineers | Conversion Calculator Plus |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.0 (2 ratings)](https://appshunter.io/ios/app/units-converter-for-engineers/id1018604081/reviews) | **[4.7 (15K ratings)](https://appshunter.io/ios/app/conversion-calculator-plus/id1113920724/reviews)** |
| Number of ratings | 2 | **15K** |
| Positive reviews | 50.0% of reviews | **69.4% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 5 weeks | **Every 6 days** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 5 MB | 58 MB |
| Requires iOS | **16.6** | 17.0 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | +4 |
| Developer | [Lucy Enterprises](https://appshunter.io/developer/1656612108) | [Adysseus](https://appshunter.io/developer/447444997) |

## What reviewers say

### Units Converter for Engineers

[App page](https://appshunter.io/ios/app/units-converter-for-engineers/id1018604081)

This tool allows professionals and students to convert units and currencies using dimensional analysis. It supports a vast number of unit combinations and includes physical constants. Currency rates are updated monthly.

**Highlights:** Free-form unit conversion via dimensional analysis, Supports over 300 single units, Supports over 165 currencies with automatic updates, Includes dozens of physical constants, Identifies unit mismatches, Glossary of available units

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock all features | $0.99 | one-time |
| Remove ads | $1.99 | one-time |


### Conversion Calculator Plus

[App page](https://appshunter.io/ios/app/conversion-calculator-plus/id1113920724)

This app is a versatile unit and currency converter with a user-friendly interface. It supports a wide range of conversion categories, including real-world and crypto currencies, with automatic exchange rate updates. Customize your experience with design options, dark mode, and adjustable home screen layouts.

**Highlights:** Unit and currency conversion, Supports 160+ currencies (real & crypto), Automatic currency exchange rate updates, Simple or carousel design options, Dark Mode support, Customizable home screen layout, Split screen mode on iPad

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| No Ads For One Year | $9.99 | per year |

**What reviewers like**

- 🚀 Great app
- 👍 Easy to use
- 🚀 Comprehensive conversions
- 👍 Intuitive interface
- 🚀 Useful tool

**What reviewers complain about**

- 🐛 Consent required for tracking
- 🐛 Update problems
- 🐛 Currency not updating
- 🔒 Forced to allow tracking
- 🔒 Forced to subscribe or view ads

**Reported bugs**

- Currency conversion not working
- App gets stuck on consent page
- Unable to get past ads/subscription page

**Requested features**

- Add running pace conversions
- Add shoe size converter
- Provide paid ad-free version


## Frequently asked questions

### Is Units Converter for Engineers free?

Units Converter for Engineers is free to download, with in-app purchases available.

### Is Conversion Calculator Plus free?

Conversion Calculator Plus is free to download, with in-app purchases available.

### Which has better reviews, Units Converter for Engineers or Conversion Calculator Plus?

Conversion Calculator Plus is rated higher. Units Converter for Engineers averages 3.0 out of 5 from 2 ratings, while Conversion Calculator Plus averages 4.7 from 15K ratings.

### Do Units Converter for Engineers or Conversion Calculator Plus have ads?

Conversion Calculator Plus shows ads; Units Converter for Engineers does not.

### Which is updated more often, Units Converter for Engineers or Conversion Calculator Plus?

Units Converter for Engineers ships an update every 5 weeks, and Conversion Calculator Plus every 6 days. Most recently, Units Converter for Engineers was updated on September 19, 2026 and Conversion Calculator Plus on October 19, 2026.

---

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