# 回転してるのな〜んだ？ vs ChatAnki/Helpful App for Study

The clearest difference is review sentiment: ChatAnki/Helpful App for Study at 50% against 回転してるのな〜んだ？'s 0%. ChatAnki/Helpful App for Study also leads on update cadence (daily vs weekly). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

回転してるのな〜んだ？ ships an update weekly, ChatAnki/Helpful App for Study daily. The most recent releases landed on September 18, 2026 and June 1, 2026 respectively.

## The numbers

| Metric | 回転してるのな〜んだ？ | ChatAnki/Helpful App for Study |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | **50.0% of reviews** |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | Weekly | **Daily** |
| Monetization | — | Ad-supported |
| Size | 39 MB | 22 MB |
| Requires iOS | **15.2** | 16.2 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Toshiyuki Susa](https://appshunter.io/developer/1556426603) | [Kodai Nakade](https://appshunter.io/developer/1679722037) |

## What reviewers say

### 回転してるのな〜んだ？

[App page](https://appshunter.io/ios/app/id1611895973)

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

**In-app purchases:** none


### ChatAnki/Helpful App for Study

[App page](https://appshunter.io/ios/app/chatankihelpful-app-for-study/id6739839734)

Create custom study materials with a personalized character that quizzes you. Import question data from your computer for efficient learning management. Set test parameters like question count and time limits.

**Highlights:** Character creation, Custom question/answer creation, Character-led quizzing, Folder organization for questions, CSV file import for questions, Adjustable test settings

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is 回転してるのな〜んだ？ free?

回転してるのな〜んだ？ is free to download, with no in-app purchases.

### Is ChatAnki/Helpful App for Study free?

ChatAnki/Helpful App for Study is free to download, with no in-app purchases.

### Do 回転してるのな〜んだ？ or ChatAnki/Helpful App for Study have ads?

Both 回転してるのな〜んだ？ and ChatAnki/Helpful App for Study show ads.

### Which is updated more often, 回転してるのな〜んだ？ or ChatAnki/Helpful App for Study?

回転してるのな〜んだ？ ships an update weekly, and ChatAnki/Helpful App for Study daily. Most recently, 回転してるのな〜んだ？ was updated on September 18, 2026 and ChatAnki/Helpful App for Study on June 1, 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.*