# AI Study Sheet vs 날벼락

The clearest difference is in-app purchases: 날벼락 at none against AI Study Sheet's 1. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. AI Study Sheet sells 1 one-off in-app purchase. 날벼락 asks for nothing beyond the download.

AI Study Sheet ships an update every 4 days, 날벼락 every 3 days. The most recent releases landed on October 24, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | AI Study Sheet | 날벼락 |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 4 days | **Every 3 days** |
| Monetization | Free with in-app purchases | — |
| Size | 9 MB | 52 MB |
| Requires iOS | 16.0 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Masaki Iino](https://appshunter.io/developer/6778272211) | [eunhyeok yang](https://appshunter.io/developer/6795759066) |

## What reviewers say

### AI Study Sheet

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

Transform existing study materials into active-recall quizzes with AI. Snap photos or import PDFs, and the app automatically masks key terms for spaced repetition. Review materials with an auto-reveal mode that adapts to your learning behavior.

**Highlights:** Import photos and PDFs, Automatic AI masking of key terms, Review reminders, Auto Study Mode with sequential reveal, Adaptive learning based on study behavior, Organized study material library, Flexible material viewing and editing

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

**In-app purchases (1)**

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


### 날벼락

[App page](https://appshunter.io/ios/app/id6795970069)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is AI Study Sheet free?

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

### Is 날벼락 free?

날벼락 is free to download, with no in-app purchases.

### Do AI Study Sheet or 날벼락 have ads?

Neither AI Study Sheet nor 날벼락 shows ads.

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

AI Study Sheet ships an update every 4 days, and 날벼락 every 3 days. Most recently, AI Study Sheet was updated on October 24, 2026 and 날벼락 on October 6, 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.*