# Red Sheet vs メモハック 暗記カード

The clearest difference is update cadence: Red Sheet at every 3 days against メモハック 暗記カード's weekly. Red Sheet also leads on iOS requirement (13.0 vs 15.1). On price, ads, in-app purchases 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 and メモハック 暗記カード sells 6 in-app purchases, starting at $1.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Red Sheet ships an update every 3 days, メモハック 暗記カード weekly. The most recent releases landed on October 16, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Red Sheet | メモハック 暗記カード |
| --- | --- | --- |
| 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 | 77.8% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | **Every 3 days** | Weekly |
| Monetization | Free with in-app purchases | — |
| Size | 193 MB | 48 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Foodmenu.world Inc.](https://appshunter.io/developer/1438351063) | [Hinata Tomoda](https://appshunter.io/developer/1790192988) |

## What reviewers say

### 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 |


### メモハック 暗記カード

[App page](https://appshunter.io/ios/app/ai/id6759282044)

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| メモハック PRO 週額 | $1.99 | per 7 days |
| メモハックPro 月額 | $5.99 | per month |
| メモハックULTRA週額 | $5.99 | per 7 days |
| メモハック Ultra 月額 | $19.99 | per month |
| メモハックPro 年額 | $59.99 | per year |
| メモハック Ultra 年額 | $199.99 | per year |


## Frequently asked questions

### Is Red Sheet free?

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

### Is メモハック 暗記カード free?

メモハック 暗記カード is free to download, with in-app purchases available.

### Do Red Sheet or メモハック 暗記カード have ads?

Both Red Sheet and メモハック 暗記カード show ads.

### Which is updated more often, Red Sheet or メモハック 暗記カード?

Red Sheet ships an update every 3 days, and メモハック 暗記カード weekly. Most recently, Red Sheet was updated on October 16, 2026 and メモハック 暗記カード on October 10, 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.*