Comparison

暗記シート vs Red Sheet

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • 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
Features
Read full description

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

About

Red Sheet

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
Read full description

◆ All-in-One PDF Memorization App with Red Sheet Study Turn your PDFs, notes, textbooks, handouts, and images into powerful study materials. This app helps students memorize faster by hiding and revealing important parts of their own documents. Import PDF files, photos, scanned notes, class handouts, worksheets, and study materials, then create memorization blocks directly on the page. It works like a digital red sheet, flashcard maker, and PDF study tool in one simple app. ◆ PDF Memorization Made Simple ・Import PDF files and study directly from the page ・Hide words, definitions, formulas, diagrams, and answers ・Tap to reveal hidden areas while reviewing ・Use red sheet style memorization on PDF pages ・Study textbooks, school handouts, exam materials, and notes ・Create your own PDF memorization notebook If you already study with PDFs, this app turns them into active memorization tools. ◆ Red Sheet Style Study for PDFs and Images Use memorization blocks to cover the parts you want to remember. Place blocks over text, formulas, diagrams, definitions, answers, or explanations. ・Hide text like using a red sheet ・Reveal answers by tapping ・Create blocks anywhere on a PDF or image ・Adjust block size by dragging the edges ・Change the color and style of blocks ・Use blocks for notes, textbooks, worksheets, and scanned documents This is useful when you want to memorize from your own materials without rewriting everything into separate flashcards. ◆ Smooth Vertical Review for Memorization Review multiple PDF pages and images smoothly. Vertical scrolling makes it easy to study long documents, like moving a red sheet from top to bottom. ・Scroll vertically through study pages ・Review many PDF pages at once ・Memorize photos and handouts continuously ・Swipe between pages and cards ・Add more images when needed ・Study at your own pace Useful for test prep, school study, certification exams, language learning, and daily review. ◆ Useful Study Tools ・One-tap show and hide for fast review ・Multiple memorization blocks for one page ・Auto-align blocks for cleaner layouts ・Zoom in with two fingers to study small text ・Hidden areas stay aligned even when zooming ・Add memo text to support memorization ・Hide memo text for self-testing ・Organize study decks by title or subject Create separate study materials for English, science, history, math, medical terms, law, certification exams, or any subject that requires memorization. ◆ Great For ・Students preparing for tests and exams ・PDF study and textbook review ・Vocabulary memorization ・Language learning ・Science, history, math, and social studies ・Certification exam preparation ・Medical, legal, and technical study ・People who want a simple flashcards maker ・Students who use GoodNotes, notes apps, or PDF files ・Anyone who wants to memorize from their own materials ◆ How to Use 1. Import a PDF file, photo, or image 2. Place memorization blocks over the parts you want to hide 3. Tap to reveal the answer while studying 4. Repeat until you can remember it 5. Organize your materials by subject and review again ◆ Why This App Is Different This app focuses on PDF memorization and red sheet style study. You do not need to recreate every page from scratch. Use your own PDFs, notes, handouts, images, and textbooks as they are, then hide only the parts you want to memorize. It is a simple way to turn everyday study materials into flashcard-style memorization tools. ◆ Recommended If You Want ・A PDF study app for memorization ・A flashcards maker from PDFs ・A red sheet style study app ・A way to memorize school notes and handouts ・A simple tool for exam preparation ・A study app that works with your own materials ・A faster way to hide and reveal answers Start studying your own PDFs, notes, and images with red sheet style memorization. Make your study materials easier to review, repeat, and remember. Terms of Service https://hidevoicy.com/en/tos Privacy Policy https://hidevoicy.com/en/privacy

Screenshots

暗記シート3 screens
Red Sheet4 screens

Verdict

The call

The clearest difference is in-app purchases: 暗記シート at none against Red Sheet's 9. Red Sheet's advantage is review sentiment (80% vs 47%) and update cadence (every 3 days vs every 2 months). On price, ads, monetization model and device support 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Red Sheet sells 7 in-app purchases, starting at $2.99 per month. 暗記シート asks for nothing beyond the download.

UpkeepUpdate frequency

暗記シート ships an update every 2 months, Red Sheet every 3 days. The most recent releases landed on September 20, 2026 and September 22, 2026 respectively.

Scorecard4 real differences · 6 level
暗記シート versus Red Sheet: the parameters behind the verdict, then further details
Parameter暗記シートRed Sheet
PriceFreeFree
Rating—4.2 (5 ratings) — better
Positive reviews46.9% of reviews80.0% of reviews — better
Number of ratings—5 — better
Update frequencyEvery 2 monthsEvery 3 days — better
AdsYesYes
In-app purchasesNo — betterYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod, Mac — better
Requires iOS15.613.0 — better
Further details — not scored
Size15 MB193 MB
Age rating4+4+
DeveloperShigeaki HaradaFoodmenu.world Inc.

Customer experience

暗記シート

Written reviews32 reviews
Positive46.9%
Neutral15.6%
Negative37.5%

Red Sheet

All ratings5 ratings
Positive80.0%
Neutral0.0%
Negative20.0%
Written reviews35 reviews
Positive80.0%
Neutral8.6%
Negative11.4%

In-app purchases

None

暗記シート

No in-app purchases

7 purchases

Red Sheet

Subscriptions7
  • Monthly Special plan$2.991 Month
  • Monthly Super Saver Plan$2.991 Month
  • Monthly Value Plan$3.991 Month
Show 4 more
  • Basic Plan$5.991 Month
  • 3 Month Plan - V 3.1.5 needed$9.993 Months
  • Half year plan (Sale)$17.996 Months
  • Half year plan - V2.9.0 needed$22.996 Months

Questions

Is 暗記シート free?
暗記シート is free to download, with no in-app purchases.
Is Red Sheet free?
Red Sheet is free to download, with in-app purchases available.
Do 暗記シート or Red Sheet have ads?
Both 暗記シート and Red Sheet show ads.
Which is updated more often, 暗記シート or Red Sheet?
暗記シート ships an update every 2 months, and Red Sheet every 3 days. Most recently, 暗記シート was updated on September 20, 2026 and Red Sheet on September 22, 2026.

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