# UnitConverter byNSDev vs Engineering Calculator

The clearest difference is ads: UnitConverter byNSDev at none against Engineering Calculator's shown. UnitConverter byNSDev also leads on monetization model (free vs ad-supported). Engineering Calculator's advantage is update cadence (monthly vs every 5 months) and iOS requirement (12.2 vs 15.6). On price, in-app purchases and device support there is nothing between them.

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

UnitConverter byNSDev ships an update every 5 months, Engineering Calculator monthly. The most recent releases landed on October 4, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | UnitConverter byNSDev | Engineering Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.5 (2 ratings)](https://appshunter.io/ios/app/engineering-calculator/id1395510375/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | 20.0% of reviews | — |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 5 months | **Monthly** |
| Monetization | **Free** | Ad-supported |
| Size | 4 MB | 1 MB |
| Requires iOS | 15.6 | **12.2** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [NIHON SYSTEM DEVELOPER CORPORATION](https://appshunter.io/developer/1198103734) | [Masato Kanazawa](https://appshunter.io/developer/1110570349) |

## What reviewers say

### UnitConverter byNSDev

[App page](https://appshunter.io/ios/app/unitconverter-bynsdev/id1229121492)

This tool converts between 26 different types of units, displaying conversion rates and allowing you to specify decimal places. It supports a vast array of units across categories like length, mass, volume, and more.

**Highlights:** Converts 26 types of units, Displays conversion rates, Customizable decimal places, Supports numerous units in various categories, User-submitted unit requests

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

**In-app purchases:** none


### Engineering Calculator

[App page](https://appshunter.io/ios/app/engineering-calculator/id1395510375)

This utility app helps users convert units and calculate tips, primarily for those in the US. It operates offline and aims for minimal user interaction to provide quick results. Useful for avoiding misunderstandings in business dealings due to unit differences.

**Highlights:** Unit conversion, Tip calculation, Offline functionality, Minimalist interface, Business negotiation aid

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

**In-app purchases:** none


## Frequently asked questions

### Is UnitConverter byNSDev free?

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

### Is Engineering Calculator free?

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

### Do UnitConverter byNSDev or Engineering Calculator have ads?

Engineering Calculator shows ads; UnitConverter byNSDev does not.

### Which is updated more often, UnitConverter byNSDev or Engineering Calculator?

UnitConverter byNSDev ships an update every 5 months, and Engineering Calculator monthly. Most recently, UnitConverter byNSDev was updated on October 4, 2026 and Engineering Calculator on September 23, 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.*