# Qdeck vs Ruidaichan

The clearest difference is update cadence: Qdeck at daily against Ruidaichan's every 5 days. Qdeck also leads on iOS requirement (13.0 vs 16.6). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Qdeck sells 1 one-off in-app purchase 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.

Qdeck ships an update daily, Ruidaichan every 5 days. The most recent releases landed on May 19, 2026 and September 15, 2026 respectively.

## The numbers

| Metric | Qdeck | Ruidaichan |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Daily** | Every 5 days |
| Size | 71 MB | 18 MB |
| Requires iOS | **13.0** | 16.6 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [FRAGMENT, LLC.](https://appshunter.io/developer/1488058907) | [Naoki Ohashi](https://appshunter.io/developer/1880818831) |

## What reviewers say

### Qdeck

[App page](https://appshunter.io/ios/app/qdeck-ocr/id6755375805)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Print out | $0.99 | 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 Qdeck free?

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

### Is Ruidaichan free?

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

### Do Qdeck or Ruidaichan have ads?

Neither Qdeck nor Ruidaichan shows ads.

### Which is updated more often, Qdeck or Ruidaichan?

Qdeck ships an update daily, and Ruidaichan every 5 days. Most recently, Qdeck was updated on May 19, 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.*