# i vs RedSheetCamera

The clearest difference is ads: RedSheetCamera at none against i's shown. i's advantage is update cadence (every 6 days vs every 15 months). On price, review sentiment, in-app purchases and monetization model there is nothing between them.

Both are free to download. i sells 10 one-off in-app purchases and RedSheetCamera sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

i ships an update every 6 days, RedSheetCamera every 15 months. The most recent releases landed on October 22, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | i | RedSheetCamera |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.2 (10 ratings)](https://appshunter.io/ios/app/i-memorize-sheet/id803026043/reviews)** | — |
| Number of ratings | **10** | — |
| Positive reviews | 42.9% of reviews | 42.9% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 6 days** | Every 15 months |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 67 MB | 9 MB |
| Requires iOS | 18.0 | **17.0** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [BrainApp LLC](https://appshunter.io/developer/726018559) | [taishin miyamoto](https://appshunter.io/developer/1570395608) |

## 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 |


### RedSheetCamera

[App page](https://appshunter.io/ios/app/redsheetcamera/id6451382182)

This study support app uses your camera to hide key information in your notes or textbooks. It then facilitates active recall practice to strengthen retention for exams, language learning, and certifications.

**Highlights:** Camera-based review of learning material, Adjustable information visibility, Uninterrupted study flow with simple controls, Supports consistent daily review, Active recall practice

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| RedSheetCamera - Remove Ads | $1.99 | one-time |


## Frequently asked questions

### Is i free?

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

### Is RedSheetCamera free?

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

### Do i or RedSheetCamera have ads?

i shows ads; RedSheetCamera does not.

### Which is updated more often, i or RedSheetCamera?

i ships an update every 6 days, and RedSheetCamera every 15 months. Most recently, i was updated on October 22, 2026 and RedSheetCamera 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.*