# Japan vs 江戸ものさし

The clearest difference is in-app purchases: 江戸ものさし at none against Japan's 1. Japan's advantage is update cadence (weekly vs every 6 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. 江戸ものさし asks for nothing beyond the download.

Japan ships an update weekly, 江戸ものさし every 6 weeks. The most recent releases landed on November 4, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Japan | 江戸ものさし |
| --- | --- | --- |
| 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 | Yes |
| Update frequency | **Weekly** | Every 6 weeks |
| Monetization | Free with in-app purchases | — |
| Size | 18 MB | 7 MB |
| Requires iOS | **16.2** | 17.1 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Koya Nambo](https://appshunter.io/developer/1633778504) | [Yusuke Kiyoi](https://appshunter.io/developer/1670887880) |

## 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 |


### 江戸ものさし

[App page](https://appshunter.io/ios/app/id6742149184)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Japan free?

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

### Is 江戸ものさし free?

江戸ものさし is free to download, with no in-app purchases.

### Do Japan or 江戸ものさし have ads?

Both Japan and 江戸ものさし show ads.

### Which is updated more often, Japan or 江戸ものさし?

Japan ships an update weekly, and 江戸ものさし every 6 weeks. Most recently, Japan was updated on November 4, 2026 and 江戸ものさし on October 30, 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.*