# US単位コンバーター vs Japan

The clearest difference is in-app purchases: US単位コンバーター at none against Japan's 1. Japan's advantage is update cadence (weekly vs every 3 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Japan sells 1 one-off in-app purchase. US単位コンバーター asks for nothing beyond the download.

US単位コンバーター ships an update every 3 weeks, Japan weekly. The most recent releases landed on June 20, 2026 and July 18, 2026 respectively.

## The numbers

| Metric | US単位コンバーター | Japan |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.8 (16 ratings)](https://appshunter.io/ios/app/japan-us-unit-conversion/id6450624167/reviews)** |
| Number of ratings | — | **16** |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 3 weeks | **Weekly** |
| Monetization | — | Free with in-app purchases |
| Size | 41 MB | 18 MB |
| Requires iOS | 16.4 | **16.2** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Taiki Saito](https://appshunter.io/developer/995768398) | [Koya Nambo](https://appshunter.io/developer/1633778504) |

## What reviewers say

### US単位コンバーター

[App page](https://appshunter.io/ios/app/us/id1607728774)

**Features:** macOS Compatibility

**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

**In-app purchases (1)**

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


## Frequently asked questions

### Is US単位コンバーター free?

US単位コンバーター is free to download, with no in-app purchases.

### Is Japan free?

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

### Do US単位コンバーター or Japan have ads?

Both US単位コンバーター and Japan show ads.

### Which is updated more often, US単位コンバーター or Japan?

US単位コンバーター ships an update every 3 weeks, and Japan weekly. Most recently, US単位コンバーター was updated on June 20, 2026 and Japan on July 18, 2026.

---

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