# UnitConverter byNSDev vs Japan

The clearest difference is in-app purchases: UnitConverter byNSDev at none against Japan's 1. UnitConverter byNSDev also leads on ads (none vs shown). Japan's advantage is update cadence (weekly vs every 5 months). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Japan sells 1 one-off in-app purchase. UnitConverter byNSDev asks for nothing beyond the download.

UnitConverter byNSDev ships an update every 5 months, Japan weekly. The most recent releases landed on October 4, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | UnitConverter byNSDev | Japan |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.8 (18 ratings)](https://appshunter.io/ios/app/japan-us-unit-conversion/id6450624167/reviews)** |
| Number of ratings | — | **18** |
| Positive reviews | 20.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 5 months | **Weekly** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 4 MB | 18 MB |
| Requires iOS | **15.6** | 16.2 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [NIHON SYSTEM DEVELOPER CORPORATION](https://appshunter.io/developer/1198103734) | [Koya Nambo](https://appshunter.io/developer/1633778504) |

## 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


### Japan

[App page](https://appshunter.io/ios/app/japan-us-unit-conversion/id6450624167)

Easily convert between Japanese and US units for length, weight, speed, volume, temperature, area, currency, and time zones. This tool is useful for travel, daily life, work, and study, offering a wide range of conversion categories.

**Highlights:** Length conversion, Weight conversion, Speed conversion, Volume conversion, Temperature conversion, Area conversion, Currency conversion, Timezone conversion

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium | $3.99 | one-time |


## Frequently asked questions

### Is UnitConverter byNSDev free?

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

### Is Japan free?

Japan is free to download, with in-app purchases available.

### Do UnitConverter byNSDev or Japan have ads?

Japan shows ads; UnitConverter byNSDev does not.

### Which is updated more often, UnitConverter byNSDev or Japan?

UnitConverter byNSDev ships an update every 5 months, and Japan weekly. Most recently, UnitConverter byNSDev was updated on October 4, 2026 and Japan on October 6, 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.*