i vs 暗記シート
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
i
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.
- Hide text with red filter effect
- Study photos and PDFs
- Add check marks for progress
- Efficient study with navigation
- Use anytime, anywhere
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【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.
暗記シート
Create your own flashcards by masking text from photos or camera input. This free app helps you memorize information through repetition and focused study sessions. Save and organize your study materials with custom categories and notes.
- Create flashcards from photos/camera
- Mask and reveal text for memorization
- Adjustable sheet and pen properties
- Unlimited file saving
- Categorize and organize study files
- iCloud Drive integration
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何度も反復して覚えることで記憶が定着! 自分で問題をつくって勉強できます。 試験勉強に最適な完全無料で使える暗記学習用アプリです。 アプリなら隙間時間を利用して勉強ができます。 文章をカメラまたはフォトライブラリからアプリに取り込み、 ペイント機能で暗記したい単語をなぞってマスキング 写真をスライドしてマスキングした単語がシートと重なっている 場合は非表示に、重なっていない場合は表示になります。 すべてのファイルを縦一列に連続表示することができるので、 集中して学習することができます。 変更した内容は、名前・カテゴリー・重要度・理解度・メモをつけて ファイル保存することができます。 ■充実の機能 下記の機能をご利用いただけます。 ・シートの色・透明度の調整機能 ・シートのサイズ調整機能 ・描画ペンの色・透明度・太さの調整機能 ・描画ペイントの全削除、アンドゥ、リドゥ、消しゴム機能 ・ピンチイン・ピンチアウト、ダブルタップで拡大・縮小 ・端末記憶容量内で無制限にファイル保存が可能 ・カテゴリー登録して、カテゴリー分類が可能 ・カテゴリー、重要度、理解度の設定 ・保存ファイルをカテゴリー、重要度、理解度で絞り込み ・メモ機能 ・縦向き表示・横向き表示 ・iCloud Driveへファイルの書き出し・読み込み機能
Screenshots
Verdict
The clearest difference is in-app purchases: 暗記シート at none against i's 10. 暗記シート also leads on iOS requirement (15.6 vs 18.0). i's advantage is update cadence (every 6 days vs every 2 months). On price, review sentiment, ads and monetization model there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. i sells 10 one-off in-app purchases. 暗記シート asks for nothing beyond the download.
i ships an update every 6 days, 暗記シート every 2 months. The most recent releases landed on September 22, 2026 and September 20, 2026 respectively.
| Parameter | i | 暗記シート |
|---|---|---|
| Price | Free | Free |
| Rating | 4.2 (10 ratings) — better | — |
| Positive reviews | 42.9% of reviews | 46.9% of reviews — better |
| Number of ratings | 10 — better | — |
| Update frequency | Every 6 days — better | Every 2 months |
| Ads | Yes | Yes |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 18.0 | 15.6 — better |
| Further details — not scored | ||
| Size | 67 MB | 15 MB |
| Age rating | 4+ | 4+ |
| Developer | BrainApp LLC | Shigeaki Harada |
Customer experience
i
暗記シート
In-app purchases
i
- i-Memorize Sheet Remove ADs Option$0.99
- imc00010$0.99
- imc00020$0.99
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- i-Mem-Contents imc00030$0.99
- i-Mem-Contents imc00040$0.99
- i-Mem-Contents imc00010$0.99
- i-memorize Sheet File-Limit release add-on$2.99
- i-memorize Sheet PDF page-Limit release add-on$4.99
- Pro licence(campaign)$5.99
- i-memorize Sheet Limit release add-on$6.99
暗記シート
No in-app purchases








