# Unit Converter HD. vs Japan

The clearest difference is update cadence: Japan at weekly against Unit Converter HD.'s every 2 months. Unit Converter HD.'s advantage is ratings volume (645 vs 20) and iOS requirement (13.0 vs 16.2). On price, rating, ads and in-app purchases there is nothing between them.

Both are free to download. Unit Converter HD. sells 1 one-off in-app purchase and Japan sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 4.7 for Unit Converter HD. against 4.8 for Japan. That said, the two scores are not equally well evidenced: Unit Converter HD. has 645 ratings behind it against 20, so its average is the more settled of the two.

Unit Converter HD. ships an update every 2 months, Japan weekly. The most recent releases landed on November 1, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | Unit Converter HD. | Japan |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (645 ratings)](https://appshunter.io/ios/app/unit-converter-hd/id481973377/reviews) | **[4.8 (20 ratings)](https://appshunter.io/ios/app/japan-us-unit-conversion/id6450624167/reviews)** |
| Number of ratings | **645** | 20 |
| Positive reviews | 93.8% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 2 months | **Weekly** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 86 MB | 18 MB |
| Requires iOS | **13.0** | 16.2 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [良峰 侯](https://appshunter.io/developer/654444245) | [Koya Nambo](https://appshunter.io/developer/1633778504) |

## What reviewers say

### Unit Converter HD.

[App page](https://appshunter.io/ios/app/unit-converter-hd/id481973377)

Easily convert over 700 units across 30 categories with this powerful tool. It offers a user-friendly interface, dark mode support, and a backspace key for quick corrections. Save time on all your measurement conversion needs.

**Highlights:** 700+ Units of Measure, 30 Conversion Categories, Easy-to-Use Interface, Dark Mode Support, Backspace Key

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads Pack | $1.99 | one-time |

**What reviewers like**

- 👍 Easy to use
- 🚀 Handy and convenient
- 💡 Comprehensive set of conversions
- 🚀 Very useful app
- 👍 Intuitive design

**What reviewers complain about**

- 🐛 Occasional crashes or freezing issues
- 💡 Could be more intuitive for some users
- 🔒 Requires horizontal orientation

**Reported bugs**

- Freezing or crashing on some devices
- Display issues with certain units

**Requested features**

- Add support for US weights (tons, lbs., oz.)
- Implement portrait mode support
- Provide more customization options


### 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 Unit Converter HD. free?

Unit Converter HD. is free to download, with in-app purchases available.

### Is Japan free?

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

### Which has better reviews, Unit Converter HD. or Japan?

Japan is rated higher. Unit Converter HD. averages 4.7 out of 5 from 645 ratings, while Japan averages 4.8 from 20 ratings.

### Do Unit Converter HD. or Japan have ads?

Both Unit Converter HD. and Japan show ads.

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

Unit Converter HD. ships an update every 2 months, and Japan weekly. Most recently, Unit Converter HD. was updated on November 1, 2026 and Japan on November 4, 2026.

---

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