# 暗記シート vs Red Sheet

The clearest difference is in-app purchases: 暗記シート at none against Red Sheet's 9. Red Sheet's advantage is review sentiment (80% vs 47%) and update cadence (every 3 days vs every 2 months). On price, ads, monetization model and device support there is nothing between them.

Both are free to download. Red Sheet sells 7 in-app purchases, starting at $2.99 per month. 暗記シート asks for nothing beyond the download.

暗記シート ships an update every 2 months, Red Sheet every 3 days. The most recent releases landed on September 20, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | 暗記シート | Red Sheet |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.2 (5 ratings)](https://appshunter.io/ios/app/red-sheet-pdf-study-app/id1580506756/reviews)** |
| Number of ratings | — | **5** |
| Positive reviews | 46.9% of reviews | **80.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 2 months | **Every 3 days** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 15 MB | 193 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Shigeaki Harada](https://appshunter.io/developer/897400523) | [Foodmenu.world Inc.](https://appshunter.io/developer/1438351063) |

## What reviewers say

### 暗記シート

[App page](https://appshunter.io/ios/app/fight/id1233490505)

Create your own flashcards by masking text from photos or camera input. This free app helps you memorize information through repetition and focused study sessions. Save and organize your study materials with custom categories and notes.

**Highlights:** Create flashcards from photos/camera, Mask and reveal text for memorization, Adjustable sheet and pen properties, Unlimited file saving, Categorize and organize study files, iCloud Drive integration

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

**In-app purchases:** none


### Red Sheet

[App page](https://appshunter.io/ios/app/red-sheet-pdf-study-app/id1580506756)

Create and study flashcards from your PDFs, notes, and images. This app lets you hide and reveal text to transform study materials into interactive flashcards for faster memorization. Supports various import options and flexible study tools.

**Highlights:** Create flashcards from PDFs, Import from note apps and cloud storage, Hide and reveal text for study, Create flashcards from photos and images, Vocabulary and word list flashcards, One-tap show/hide for quick review

**Features:** Vision Pro support

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Special plan | $2.99 | per month |
| Monthly Super Saver Plan | $2.99 | per month |
| Monthly Value Plan | $3.99 | per month |
| Basic Plan | $5.99 | per month |
| 3 Month Plan - V 3.1.5 needed | $9.99 | per 3 months |
| Half year plan (Sale) | $17.99 | per 6 months |
| Half year plan - V2.9.0 needed | $22.99 | per 6 months |


## Frequently asked questions

### Is 暗記シート free?

暗記シート is free to download, with no in-app purchases.

### Is Red Sheet free?

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

### Do 暗記シート or Red Sheet have ads?

Both 暗記シート and Red Sheet show ads.

### Which is updated more often, 暗記シート or Red Sheet?

暗記シート ships an update every 2 months, and Red Sheet every 3 days. Most recently, 暗記シート was updated on September 20, 2026 and Red Sheet on September 22, 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.*