# Japan vs Unit Converter

The clearest difference is in-app purchases: Unit Converter at none against Japan's 1. Unit Converter also leads on ads (none vs shown). Japan's advantage is update cadence (weekly vs monthly). 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. Unit Converter asks for nothing beyond the download.

Japan ships an update weekly, Unit Converter monthly. The most recent releases landed on November 4, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Japan | Unit Converter |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (20 ratings)](https://appshunter.io/ios/app/japan-us-unit-conversion/id6450624167/reviews)** | — |
| Number of ratings | **20** | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Weekly** | Monthly |
| Monetization | Free with in-app purchases | — |
| Size | 18 MB | 6 MB |
| Requires iOS | **16.2** | 17.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Koya Nambo](https://appshunter.io/developer/1633778504) | [SANWA Inc.](https://appshunter.io/developer/1878028373) |

## What reviewers say

### 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 |


### Unit Converter

[App page](https://appshunter.io/ios/app/unit-converter-tanicon/id6760239210)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Japan free?

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

### Is Unit Converter free?

Unit Converter is free to download, with no in-app purchases.

### Do Japan or Unit Converter have ads?

Japan shows ads; Unit Converter does not.

### Which is updated more often, Japan or Unit Converter?

Japan ships an update weekly, and Unit Converter monthly. Most recently, Japan was updated on November 4, 2026 and Unit Converter on October 31, 2026.

---

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