# QuizChat/Helpful App for Study vs 存在しない記憶.zip

The clearest difference is in-app purchases: QuizChat/Helpful App for Study at none against 存在しない記憶.zip's 4. QuizChat/Helpful App for Study also leads on update cadence (every 2 days vs every 2 months). 存在しない記憶.zip's advantage is iOS requirement (15.1 vs 26.2). On price, ads and device support there is nothing between them.

Both are free to download. 存在しない記憶.zip sells 4 one-off in-app purchases. QuizChat/Helpful App for Study asks for nothing beyond the download.

QuizChat/Helpful App for Study ships an update every 2 days, 存在しない記憶.zip every 2 months. The most recent releases landed on October 13, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | QuizChat/Helpful App for Study | 存在しない記憶.zip |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | **Every 2 days** | Every 2 months |
| Monetization | Ad-supported | — |
| Size | 24 MB | 131 MB |
| Requires iOS | 26.2 | **15.1** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Kodai Nakade](https://appshunter.io/developer/1679722037) | [Hikaru Sawada](https://appshunter.io/developer/1584988593) |

## What reviewers say

### QuizChat/Helpful App for Study

[App page](https://appshunter.io/ios/app/quizchathelpful-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


### 存在しない記憶.zip

[App page](https://appshunter.io/ios/app/zip-ai/id6757909429)

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 200coins | $1.99 | one-time |
| 500coins | $4.99 | one-time |
| 1000coins | $7.99 | one-time |
| 3000coins | $19.99 | one-time |


## Frequently asked questions

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

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

### Is 存在しない記憶.zip free?

存在しない記憶.zip is free to download, with in-app purchases available.

### Do QuizChat/Helpful App for Study or 存在しない記憶.zip have ads?

Both QuizChat/Helpful App for Study and 存在しない記憶.zip show ads.

### Which is updated more often, QuizChat/Helpful App for Study or 存在しない記憶.zip?

QuizChat/Helpful App for Study ships an update every 2 days, and 存在しない記憶.zip every 2 months. Most recently, QuizChat/Helpful App for Study was updated on October 13, 2026 and 存在しない記憶.zip on October 11, 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.*