# AI Study Sheet vs 문득

The clearest difference is review sentiment: AI Study Sheet at 100% against 문득's 50%. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. AI Study Sheet sells 1 one-off in-app purchase and 문득 sells 2 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

AI Study Sheet ships an update every 4 days, 문득 every 3 days. Both last shipped on November 1, 2026.

## The numbers

| Metric | AI Study Sheet | 문득 |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | **100.0% of reviews** | 50.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 4 days | **Every 3 days** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 9 MB | 66 MB |
| Requires iOS | **16.0** | 17.2 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 12+ |
| Developer | [Masaki Iino](https://appshunter.io/developer/6778272211) | [JIHWAN YEOM](https://appshunter.io/developer/6805761199) |

## What reviewers say

### AI Study Sheet

[App page](https://appshunter.io/ios/app/ai-study-sheet-flashcards/id6782023263)

Transform your study materials into interactive flashcards without retyping. This app uses AI to hide key terms in photos and PDFs, helping you memorize information for exams and courses. It offers customizable study modes and personalized review recommendations.

**Highlights:** AI-powered term masking, Import from photos and PDFs, Customizable study modes, Personalized review recommendations, Organize with folders and search, Share editable study materials, On-device AI processing

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlimited Saves | $4.99 | one-time |


### 문득

[App page](https://appshunter.io/ios/app/ai-pdf/id6805761197)

This app helps students review study materials without dedicated study time. It uses AI to generate quizzes from PDFs, Notion pages, or photos, and presents them on your lock screen for effortless learning. Track your progress and get customized quizzes to reinforce weak areas.

**Highlights:** AI quiz generation from PDFs, Notion, and photos, Lock screen review cards, Automated question and answer creation, Learning reports and weakness analysis, Customized quiz generation for weak areas, No manual card creation required

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 문득 베이직 | $1.99 | per month |
| 크레딧 10개 | $1.99 | one-time |


## Frequently asked questions

### Is AI Study Sheet free?

AI Study Sheet is free to download, with in-app purchases available.

### Is 문득 free?

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

### Do AI Study Sheet or 문득 have ads?

Neither AI Study Sheet nor 문득 shows ads.

### Which is updated more often, AI Study Sheet or 문득?

AI Study Sheet ships an update every 4 days, and 문득 every 3 days. Most recently, AI Study Sheet was updated on November 1, 2026 and 문득 on November 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.*