# i vs スマホで赤シート

The clearest difference is in-app purchases: スマホで赤シート at none against i's 10. スマホで赤シート also leads on ads (none vs shown) and update cadence (daily vs every 6 days). On price, device support and iOS requirement there is nothing between them.

Both are free to download. i sells 10 one-off in-app purchases. スマホで赤シート asks for nothing beyond the download.

i ships an update every 6 days, スマホで赤シート daily. The most recent releases landed on October 15, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | i | スマホで赤シート |
| --- | --- | --- |
| 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 | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 6 days | **Daily** |
| Monetization | Free with in-app purchases | — |
| Size | 67 MB | 3 MB |
| Requires iOS | 18.0 | **17.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [BrainApp LLC](https://appshunter.io/developer/726018559) | [Keisuke Shibata](https://appshunter.io/developer/1791551970) |

## 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 |


### スマホで赤シート

[App page](https://appshunter.io/ios/app/id6468587251)

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

**In-app purchases:** none


## Frequently asked questions

### Is i free?

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

### Is スマホで赤シート free?

スマホで赤シート is free to download, with no in-app purchases.

### Do i or スマホで赤シート have ads?

i shows ads; スマホで赤シート does not.

### Which is updated more often, i or スマホで赤シート?

i ships an update every 6 days, and スマホで赤シート daily. Most recently, i was updated on October 15, 2026 and スマホで赤シート on October 14, 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.*