# Subtraction App vs 回転漢字クイズ

The clearest difference is in-app purchases: 回転漢字クイズ at none against Subtraction App's 1. Subtraction App's advantage is iOS requirement (14.0 vs 16.6). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Subtraction App sells 1 in-app purchase, starting at $1.99 per month. 回転漢字クイズ asks for nothing beyond the download.

Subtraction App ships an update every 2 weeks, 回転漢字クイズ weekly. The most recent releases landed on October 11, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Subtraction App | 回転漢字クイズ |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | Every 2 weeks | **Weekly** |
| Size | 26 MB | 26 MB |
| Requires iOS | **14.0** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Foodmenu.world Inc.](https://appshunter.io/developer/1438351063) | [YUKI WATANABE](https://appshunter.io/developer/1724288537) |

## What reviewers say

### Subtraction App

[App page](https://appshunter.io/ios/app/subtraction-app/id1622934481)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium | $1.99 | per month |


### 回転漢字クイズ

[App page](https://appshunter.io/ios/app/1/id6740872345)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Subtraction App free?

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

### Is 回転漢字クイズ free?

回転漢字クイズ is free to download, with no in-app purchases.

### Do Subtraction App or 回転漢字クイズ have ads?

Both Subtraction App and 回転漢字クイズ show ads.

### Which is updated more often, Subtraction App or 回転漢字クイズ?

Subtraction App ships an update every 2 weeks, and 回転漢字クイズ weekly. Most recently, Subtraction App was updated on October 11, 2026 and 回転漢字クイズ on October 6, 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.*