# i-Memorize Sheet — Japanese memorise method

> Memorization study app that hides text using image analysis and filters. (iPhone/iPad app by BrainApp LLC.)

- Source: https://appshunter.io/ios/app/i-memorize-sheet/id803026043 (this page in markdown: same URL + `.md`)
- Developer: [BrainApp LLC](https://appshunter.io/developer/726018559)
- Category: Education, Photo & Video
- Price: Free with in-app purchases
- Rating: 4.20/5 from 10 App Store ratings · 77 written reviews indexed
- Age rating: 4+
- Requires: iOS 18.0 · 67 MB
- Released: 2014-02-20
- Data updated: 2026-09-06
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/i-memorize-sheet/id803026043/reviews.md

## What is i?

【Ranked #1 in the Education category (free)】
【Over 1 million downloads】

Featured in various media:
・Fuji TV "Minna no News (2017/2/9)": Red-sheet generation stunned! A revolution in memorization methods
・Benesse Manapla: Make high school life even more fun! 3 useful apps
・Nikkei Trendy Net "TODA Satoru’s Deep-Dive Report on Gadgets": How working adults use iPad and handwriting apps for learning

i-Memorization Sheet is an app for memorization study that hides words, sentences, dates, etc. using a filter so you can study them.
The app uses image analysis to reproduce the same effect as using a real red filter. Therefore, red text in reference books can be hidden simply by photographing it.
You can also import entire reference books by converting them to PDF. With just an iPhone, you can study anytime, anywhere.

【Benefits of i-Memorization Sheet】
- Study anytime, anywhere—e.g., easily memorize with one hand on the train.
- Carry as many pages as you want just by bringing your smartphone.
- Disappears better than real red sheets. All reddish colors are hidden. Green is fine if it's a fluorescent highlighter.
- You can add check marks anywhere. Double-tap where you want to place a mark. There is also a function to jump to the next check mark, making studying very efficient.

【Supported materials】
- Photos and PDFs can be used.

【Pricing】
You can use the app for free for up to 10 pages in total.
If you want to use more files/pages, please purchase an add-on.
Ads are displayed, but purchasing the add-on can disable them.

## Key features

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

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| i-memorize Sheet Limit release add-on | $6.99 | one-time |
| i-Memorize Sheet Remove ADs Option | $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 |
| 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 |
| Pro licence(campaign) | $5.99 | one-time |


## Recent user reviews (10 of 77)

All indexed reviews: https://appshunter.io/ios/app/i-memorize-sheet/id803026043/reviews.md

### 2/5 — すごく良さそうなのに

*2026-05-07, version 6.0.7*

暗記画面からホーム画面や設定を開けない
強制終了しても無理。
無料プランだからですか？ipad第10世代です

### 3/5 — 任意のマーカー作成がやりにくい

*2026-03-09, version 6.0.6*

赤文字に反応して自動マーカー作ってくれる機能はありがたい。自分でマーカー作ろうとするとやりにくい。

### 1/5 — 確実に改悪。

*2026-02-15, version 6.0.3*

従来は、赤字部分を「赤シート」で自然に消して透明化できる仕様で、とても使いやすく重宝していました。ところがアップデート後は、赤字部分を黒塗りする方式に変更されています。

しかしその認識精度が十分ではなく、「黒字に赤い下線」が引かれている箇所まで黒塗りされてしまいます。本来消したい「赤字」だけを選んで隠すことができず、学習には使えないと判断しました。黒塗りをするということだけでいえば、他のアプリの方が精度が高いと感じます。

特に残念なのは、以前の仕様にあった「白地補正・黒字補正」なスタンプ・タグ機能などが削除されている点です。便利だった機能がなくなったことで、実質的に機能が後退した印象を受けました。

また、他の人も指摘している通り、「イルカの暗記シート」への誘導を意図した変更のようにも感じられ、ユーザーとしては改悪と受け止めざるを得ません。

以前のシンプルで使いやすい仕様への復活を強く希望します。

### 1/5 — 変な改悪アプデ入った？

*2026-02-02, version 6.0.1*

アプリ開いて過去に読み込んでたファイルを開いて進めていると何回何十回やってもアプリが落ちます。もう消します。前までこんな事なかった。

### 1/5 — 使いにくくなった

*2026-02-02, version 6.0.1*

無駄に凝ったui になって見にくい、消し方がとても雑になって見にくくなった、もう使わない

### 1/5 — 最悪のアプデ

*2026-02-02, version 6.0.1*

自動でアップデートされてしまい、アプリが重すぎて旧ファイルも移行できない状態。
試験前に勘弁してほしい。

### 1/5 — あまりにも改悪

*2026-01-30, version 6.0.0*

間違えてアップデートしてしまって、全てのデータが消えた。イルカに移行させるために改悪したとしか思えない。本当に残念です。

### 5/5 — Miracle

*2025-12-14*

Unbelievable app for Memorizing pdf text or anything els

### 1/5 — It makes you pay at a small limit

*2025-08-25*

Thats all i have to say

### 5/5 — Pretty decent app

*2025-08-12*

Thats all i have to say

## Frequently asked questions about i

### How does i-Memorize Sheet hide text?

i-Memorize Sheet uses image analysis to reproduce the effect of a red filter, hiding reddish colors in reference books when photographed. It can also hide green fluorescent highlighter marks.

### What materials can I use with i-Memorize Sheet?

You can use photos of your study materials or import entire reference books by converting them to PDF. This flexibility allows for diverse study content.

### Can I track my progress with i-Memorize Sheet?

Yes, you can add check marks anywhere on the page by double-tapping. The app also has a function to jump to the next check mark, enhancing study efficiency.

### What is the free version of i-Memorize Sheet limited to?

The free version allows you to use up to 10 pages in total. For more files or pages, an add-on purchase is required.

### Does i-Memorize Sheet have ads?

Yes, advertisements are displayed in the app. Purchasing the add-on can disable these ads.

### Is i-Memorize Sheet available on multiple devices?

Yes, i-Memorize Sheet is supported on both iPhone and iPad, allowing for versatile study sessions across Apple devices.

### How often is i-Memorize Sheet updated?

The app was last updated on February 20, 2026, indicating regular maintenance and potential feature additions.

### What is the user sentiment for i-Memorize Sheet?

The app has a rating of 4.2 stars from 10 ratings, suggesting generally positive user experiences with its memorization features.

## Version history (last 5 releases)

### 6.0.7 — 2026-04-13

bug fix.

### 6.0.6 — 2026-02-20

- Improved editing features: Enhanced marker application method and added a hole-punch feature (create areas that remain visible even when using the red sheet).
- Bug fixes

### 6.0.5 — 2026-02-17

Free plan users can now create books by watching ads.

### 6.0.4 — 2026-02-16

Free plan users can now create books by watching ads.

### 6.0.3 — 2026-02-06

bug fix.

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| [Flash Cards & Dictionary](https://appshunter.io/ios/app/flash-cards-and-dictionary/id1632848452) | — | Free | Education |
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## More apps by BrainApp LLC

- [Dolphin English Flashcard](https://appshunter.io/ios/app/dolphin-english-flashcard/id1470810497)
- [Dolphin Memorize](https://appshunter.io/ios/app/dolphin-memorize/id1483320043)
- [Campus Calendar 授業日程がわかる時間割アプリ](https://appshunter.io/ios/app/campus-calendar/id6753108364)

All apps by BrainApp LLC: https://appshunter.io/developer/726018559

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-06.*