# i vs Red Sheet

i and Red Sheet both sit at 4.2 stars, but that hides the real split: 80% of Red Sheet's written reviews are positive against 43% of i's. Red Sheet also leads on device support (4 vs 2) and iOS requirement (13.0 vs 18.0). On price, rating, ratings volume and update cadence there is nothing between them.

Both are free to download. i sells 10 one-off in-app purchases 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.

On the App Store both sit at effectively the same score — 4.2 for i against 4.2 for Red Sheet. Both are backed by a comparable volume of ratings — 10 and 5 respectively. Written reviews are what separate them: 43% of i's written reviews are positive against 80% of Red Sheet's.

i ships an update every 6 days, Red Sheet every 3 days. Both last shipped on September 22, 2026.

## The numbers

| Metric | i | Red Sheet |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.2 (10 ratings)](https://appshunter.io/ios/app/i-memorize-sheet/id803026043/reviews) | [4.2 (5 ratings)](https://appshunter.io/ios/app/red-sheet-pdf-study-app/id1580506756/reviews) |
| Number of ratings | **10** | 5 |
| Positive reviews | 42.9% of reviews | **80.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 6 days | **Every 3 days** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 67 MB | 193 MB |
| Requires iOS | 18.0 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [BrainApp LLC](https://appshunter.io/developer/726018559) | [Foodmenu.world Inc.](https://appshunter.io/developer/1438351063) |

## What reviewers say

### i

[App page](https://appshunter.io/ios/app/i-memorize-sheet/id803026043)

This app allows users to hide text in study materials using a filter, mimicking a red sheet for effective memorization. It supports photos and PDFs, enabling studying anytime, anywhere with just a smartphone.

**Highlights:** Hide text with red filter effect, Study photos and PDFs, Add check marks for progress, Efficient study with navigation, Use anytime, anywhere

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| i-Memorize Sheet Remove ADs Option | $0.99 | one-time |
| imc00010 | $0.99 | one-time |
| imc00020 | $0.99 | one-time |
| i-Mem-Contents imc00030 | $0.99 | one-time |
| i-Mem-Contents imc00040 | $0.99 | one-time |
| i-Mem-Contents imc00010 | $0.99 | one-time |
| i-memorize Sheet File-Limit release add-on | $2.99 | one-time |
| i-memorize Sheet PDF page-Limit release add-on | $4.99 | one-time |
| Pro licence(campaign) | $5.99 | one-time |
| i-memorize Sheet Limit release add-on | $6.99 | one-time |


### 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 i free?

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

### Is Red Sheet free?

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

### Which has better reviews, i or Red Sheet?

i and Red Sheet are both rated 4.2 out of 5 on the App Store, from 10 and 5 ratings respectively.

### Do i or Red Sheet have ads?

Both i and Red Sheet show ads.

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

i ships an update every 6 days, and Red Sheet every 3 days. Most recently, i was updated on September 22, 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.*