Study PDF Reader: Red Sheet
Mask PDF & Memorize PDF Texts
Free · In-App Purchases
Import PDFs exported from note apps like GoodNotes and use them for memorization.
Hide colored text or cover any area with blocks to create your own study sheets and switch visibility
with a single tap. Designed for simple, fast, and flexible memorizing on your phone or tablet.
PDF memorization
- Import PDFs from note apps or cloud storage
- Hide red, blue, orange, or other colored text for red-sheet style study
- Use adjustable blocks to mask any area even when colors are not available
- Scroll vertically across pages for smooth review
Photo and image memorization
- Add notebook photos, handouts, or whiteboard shots
- Hide words or formulas just like placing a sheet over the page
- Tap to show or hide only the parts you want to memorize
Flashcards and word lists
- Create simple vocabulary lists
- Hide definitions or words for quick self-testing
Study tools
- One-tap show and hide for efficient review
- Create multiple blocks quickly for consecutive items
- Auto-align blocks for clean organization
- Zoom without shifting your hidden areas
- Swipe between pages and images
Great for:
- Test prep and school study
- Language learning and vocabulary practice
- Certification exams
- Any subject that requires memorization
How to use:
1. Import a PDF or add photos
2. Hide text by color or place blocks on the parts you want to memorize
3. Tap to show or hide while reviewing
4. Repeat and study at your own pace
Terms of Service
https://hidevoicy.com/en/tos
Privacy Policy
https://hidevoicy.com/en/privacy
Ratings & Reviews
- This app has not received enough ratings or reviews to display an overview.
Enhanced the memorisation features for PDFs and photos!
The developer, Foodmenu.world Inc., indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Location
- Identifiers
- Usage Data
- Diagnostics
Data Linked to You
The following data may be collected and linked to your identity:
- Location
- Identifiers
- Usage Data
- Diagnostics
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Size
- 173.3 MB
- Category
- Education
- Compatibility
Requires iOS 13.0 or later.
- iPhone
Requires iOS 13.0 or later. - iPad
Requires iPadOS 13.0 or later. - iPod touch
Requires iOS 13.0 or later. - Mac
Requires macOS 10.15 or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
English and 13 more
- English, German, Hindi, Indonesian, Italian, Japanese, Korean, Malay, Simplified Chinese, Spanish, Tamil, Thai, Traditional Chinese, Vietnamese
- Age Rating
4+
- 4+
- Contains
Advertising
- In-App Purchases
Yes
- Monthly Value Plan 39,00 kr
- Monthly Super Saver Plan 29,00 kr
- Monthly Special plan 29,00 kr
- 3 Month Plan - V 3.1.5 needed 89,00 kr
- Half year plan (Sale) 149,00 kr
- Half year plan - V2.9.0 needed 199,00 kr
- Basic Plan 49,00 kr
- Provider
Foodmenu.world Inc.
- Foodmenu.world Inc. has not identified itself as a trader for this app. If you are a consumer in the European Economic Area, consumer rights do not apply to agreements between you and the provider.
- Copyright
- 赤シートアプリ ©︎2026 Foodmenu.world Inc.