# 無限漢字ドリル vs Ruidaichan

The clearest difference is ads: Ruidaichan at none against 無限漢字ドリル's shown. Ruidaichan also leads on iOS requirement (16.6 vs 18.5). On price, update cadence, in-app purchases and device support there is nothing between them.

Both are free to download. 無限漢字ドリル sells 2 in-app purchases, starting at $1.99 per month and Ruidaichan sells 2 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

無限漢字ドリル ships an update every 4 days, Ruidaichan every 5 days. The most recent releases landed on August 23, 2026 and September 15, 2026 respectively.

## The numbers

| Metric | 無限漢字ドリル | Ruidaichan |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 4 days** | Every 5 days |
| Size | 21 MB | 18 MB |
| Requires iOS | 18.5 | **16.6** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Yumi Mochizuki](https://appshunter.io/developer/1859858468) | [Naoki Ohashi](https://appshunter.io/developer/1880818831) |

## What reviewers say

### 無限漢字ドリル

[App page](https://appshunter.io/ios/app/ai-and/id6756286848)

**Features:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| プレミアムプラン（月額） | $1.99 | per month |
| 生成無制限&広告非表示プラン（買い切り） | $9.99 | one-time |


### Ruidaichan

[App page](https://appshunter.io/ios/app/ruidaichan-extra-math-practice/id6759811359)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Light Plan | $1.99 | per month |
| Premium Plan | $4.99 | per month |


## Frequently asked questions

### Is 無限漢字ドリル free?

無限漢字ドリル is free to download, with in-app purchases available.

### Is Ruidaichan free?

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

### Do 無限漢字ドリル or Ruidaichan have ads?

無限漢字ドリル shows ads; Ruidaichan does not.

### Which is updated more often, 無限漢字ドリル or Ruidaichan?

無限漢字ドリル ships an update every 4 days, and Ruidaichan every 5 days. Most recently, 無限漢字ドリル was updated on August 23, 2026 and Ruidaichan on September 15, 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.*