Red Sheet vs メモハック 暗記カード
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- 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
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◆ 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
メモハック 暗記カード
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【教科書を1ページ撮るだけ。AIが穴埋めの一問一答と解説にします】 宅建・行政書士・社労士の条文も、簿記の勘定科目も、日本史の年号も、撮れば問題になります。解説つきで、赤シートでも4択でも解けます。 「覚えたはずなのに、テスト本番で思い出せない」。その原因は“復習のタイミング”にあります。メモハックは、AI×科学的な間隔反復学習で「本番で思い出せる記憶」をつくる暗記学習アプリです。 ■ 3ステップでかんたん スキャン:教科書・ノート・参考書をカメラで撮影 AIが出題:要点を読み取り、一問一答やクイズを自動生成 最適なタイミングで復習:忘れかけた頃にAIが出題し、記憶に定着 ■ メモハックが選ばれる理由 ・撮るだけAI出題 … 面倒な単語帳・問題集づくりはもう不要 ・科学的な間隔反復(SRS)… あなたの記憶度に合わせて復習日を自動調整 ・アクティブリコール … “思い出す”練習で、使える知識に ・習熟度の可視化 … どこまで覚えたか一目でわかる ・目標に合わせた学習 … 志望校・資格試験に最適化 ・学習ストリーク … 毎日続く仕組みで習慣化 ・ランキング … 仲間と競って、やる気アップ ・オフライン復習 … 移動中でもサクサク ■ こんな方におすすめ ・英単語・古文単語・用語をとにかく覚えたい人 ・資格試験・国家試験を控えた社会人 ・暗記が苦手、勉強が続かない人 ■ 料金 ・無料プランで今すぐスタート ・PRO / ULTRA … AI出題をたっぷり使える有料プラン。より高性能なAIで、本気の受験・資格対策に。 ※有料プランは自動更新サブスクリプションです。詳細はアプリ内、プライバシーポリシー・利用規約をご確認ください。 スキマ時間を、暗記の時間に。 「覚える」をラクにする、メモハックを今すぐ無料で。
Screenshots
Verdict
The clearest difference is update cadence: Red Sheet at every 3 days against メモハック 暗記カード's weekly. Red Sheet also leads on iOS requirement (13.0 vs 15.1). On price, ads, in-app purchases 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
Both are free to download. Red Sheet sells 7 in-app purchases, starting at $2.99 per month and メモハック 暗記カード sells 6 in-app purchases, starting at $1.99 per 7 days. Whichever you choose, the download price is not the number that matters.
Red Sheet ships an update every 3 days, メモハック 暗記カード weekly. The most recent releases landed on October 16, 2026 and October 10, 2026 respectively.
| Parameter | Red Sheet | メモハック 暗記カード |
|---|---|---|
| Price | Free | Free |
| Rating | 4.2 (5 ratings) — better | — |
| Positive reviews | 77.8% of reviews | — |
| Number of ratings | 5 — better | — |
| Update frequency | Every 3 days — better | Weekly |
| Ads | Yes | Yes |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod, Mac — better | iPhone, iPad, iPod |
| Requires iOS | 13.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 193 MB | 48 MB |
| Age rating | 4+ | 4+ |
| Developer | Foodmenu.world Inc. | Hinata Tomoda |
In-app purchases
Red Sheet
- Monthly Special plan$2.991 Month
- Monthly Super Saver Plan$2.991 Month
- Monthly Value Plan$3.991 Month
Show 4 moreShow fewer
- 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
メモハック 暗記カード
- メモハック PRO 週額$1.997 Days
- メモハックPro 月額$5.991 Month
- メモハックULTRA週額$5.997 Days
Show 3 moreShow fewer
- メモハック Ultra 月額$19.991 Month
- メモハックPro 年額7 Days trial$59.991 Year
- メモハック Ultra 年額7 Days trial$199.991 Year









