# 単位計算機 vs Metrivea

The clearest difference is in-app purchases: 単位計算機 at none against Metrivea's 1. 単位計算機 also leads on iOS requirement (12.0 vs 18.6). Metrivea's advantage is update cadence (every 5 months vs every 27 months). On price, ads and device support there is nothing between them.

Both are free to download. Metrivea sells 1 one-off in-app purchase. 単位計算機 asks for nothing beyond the download.

単位計算機 ships an update every 27 months, Metrivea every 5 months. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | 単位計算機 | Metrivea |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.7 (6 ratings)](https://appshunter.io/ios/app/id993194260/reviews)** | — |
| Number of ratings | **6** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 27 months | **Every 5 months** |
| Size | 8 MB | 5 MB |
| Requires iOS | **12.0** | 18.6 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Seiji Nagano](https://appshunter.io/developer/689628441) | [Yasuhiro Hamada](https://appshunter.io/developer/1825750232) |

## What reviewers say

### 単位計算機

[App page](https://appshunter.io/ios/app/id993194260)

**Features:** macOS Compatibility

**In-app purchases:** none


### Metrivea

[App page](https://appshunter.io/ios/app/metrivea/id6761003718)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 広告を削除 | $1.99 | one-time |


## Frequently asked questions

### Is 単位計算機 free?

単位計算機 is free to download, with no in-app purchases.

### Is Metrivea free?

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

### Do 単位計算機 or Metrivea have ads?

Both 単位計算機 and Metrivea show ads.

### Which is updated more often, 単位計算機 or Metrivea?

単位計算機 ships an update every 27 months, and Metrivea every 5 months. Most recently, 単位計算機 was updated on October 24, 2026 and Metrivea on October 25, 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.*