# TextbookDojo vs Red Sheet

The clearest difference is update cadence: Red Sheet at every 3 days against TextbookDojo's every 9 days. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. TextbookDojo sells 3 in-app purchases, starting at $4.49 per month and Red Sheet sells 7 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

TextbookDojo ships an update every 9 days, Red Sheet every 3 days. The most recent releases landed on October 15, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | TextbookDojo | 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 | — | 77.8% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 9 days | **Every 3 days** |
| Monetization | — | Free with in-app purchases |
| Size | 102 MB | 193 MB |
| Requires iOS | 14.0 | **13.0** |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [ROBOBO, K.K.](https://appshunter.io/developer/1338822905) | [Foodmenu.world Inc.](https://appshunter.io/developer/1438351063) |

## What reviewers say

### TextbookDojo

[App page](https://appshunter.io/ios/app/textbookdojo/id1338822906)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 month payment | $4.49 | per month |
| 1 year payment | $19.99 | per year |
| プレミアム年払い（期間限定特別価格） | $19.99 | per year |


### 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 TextbookDojo free?

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

### Is Red Sheet free?

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

### Do TextbookDojo or Red Sheet have ads?

Both TextbookDojo and Red Sheet show ads.

### Which is updated more often, TextbookDojo or Red Sheet?

TextbookDojo ships an update every 9 days, and Red Sheet every 3 days. Most recently, TextbookDojo was updated on October 15, 2026 and Red Sheet on October 24, 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.*