# 単位計算機 vs UnitConverter byNSDev

The clearest difference is ads: UnitConverter byNSDev at none against 単位計算機's shown. UnitConverter byNSDev also leads on update cadence (every 5 months vs every 27 months) and review sentiment (20% vs 0%). 単位計算機's advantage is iOS requirement (12.0 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.

単位計算機 ships an update every 27 months, UnitConverter byNSDev every 5 months. The most recent releases landed on October 2, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | 単位計算機 | UnitConverter byNSDev |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.7 (6 ratings)](https://appshunter.io/ios/app/id993194260/reviews)** | — |
| Number of ratings | **6** | — |
| Positive reviews | 0.0% of reviews | **20.0% of reviews** |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 27 months | **Every 5 months** |
| Monetization | — | Free |
| Size | 8 MB | 4 MB |
| Requires iOS | **12.0** | 15.6 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Seiji Nagano](https://appshunter.io/developer/689628441) | [NIHON SYSTEM DEVELOPER CORPORATION](https://appshunter.io/developer/1198103734) |

## What reviewers say

### 単位計算機

[App page](https://appshunter.io/ios/app/id993194260)

**Features:** macOS Compatibility

**In-app purchases:** none


### 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


## Frequently asked questions

### Is 単位計算機 free?

単位計算機 is free to download, with no in-app purchases.

### Is UnitConverter byNSDev free?

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

### Do 単位計算機 or UnitConverter byNSDev have ads?

単位計算機 shows ads; UnitConverter byNSDev does not.

### Which is updated more often, 単位計算機 or UnitConverter byNSDev?

単位計算機 ships an update every 27 months, and UnitConverter byNSDev every 5 months. Most recently, 単位計算機 was updated on October 2, 2026 and UnitConverter byNSDev on October 4, 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.*