SmartRedFilter
AI Study Sheet & Answer Hider
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
Hide red answers while the page stays readable. Study books, notes, and your own red-pen materials through the camera.
Point your camera at a study guide. Your iPhone becomes a smart red study sheet.
Hide red answers quickly and make memorization smoother.
Check what you truly remember right where you study.
SmartRedFilter is a memorization study app that uses your iPhone camera to hide answer text such as red writing while you look at your learning materials.
A key benefit is that it can automatically recognize red text and hide the answers without turning the whole screen red.
Black text and the rest of the page stay easy to read, so you can focus on the answers you want to recall.
No need to carry a physical red sheet. With just your iPhone, you can review whenever you want.
Point the camera at study guides, workbooks, vocabulary books, exam materials, and more to cover answers and keep your study rhythm moving.
It is useful beyond printed books too. You can also hide text you wrote yourself with a pen or similar writing tool.
Write answers into notes or worksheets and turn your own materials into custom memorization practice.
"Recall before you reveal."
That small step matters when you want knowledge to stick.
With SmartRedFilter, you can hide answers as you study and turn passive reading into active recall.
■ Great for
- Hiding red answers in study guides
- Exam prep, school tests, and certification study
- Memorizing vocabulary, terms, dates, and formulas
- Reworking problem sets without seeing the answers first
- Reviewing notes or worksheets with your own written answers hidden
- Quick red-sheet style review away from your desk
■ Features
- Study directly through the camera
- Hide red text while keeping the page readable instead of tinting the whole screen red
- Cover answers with a red-sheet style workflow
- Use printed books, handwritten notes, and your own study materials
- Reveal and hide answers quickly for checking
- Adjust the view to fit different materials and lighting
- Start memorization practice with the iPhone you already carry
■ Made for
- Students preparing for entrance exams
- Learners working through certification and license exams
- Anyone who wants to review during commutes or short breaks
- People who like red-sheet memorization
- Learners who write answers themselves to remember them better
- Anyone who wants to get more value from the study materials they already use
Studying is easier to continue when it is quick to start.
Make your usual books and notes into a more convenient memorization tool with SmartRedFilter.
Support Site
https://adolfoi.info/
Privacy Policy
https://adolfoi.info/page_id197/
Terms of Use
https://adolfoi.info/page_id501/
Contact
https://adolfoi.info/support/
The App Store screenshots quote an image from the following book.
新版普通免許一発で合格！ 長信一 新星出版社
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, Mitsuhiro Hashimoto, 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:
- Identifiers
- Usage Data
- Diagnostics
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Purchases
- Identifiers
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Mitsuhiro Hashimoto
- Size
- 11 MB
- Category
- Education
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
English and 33 more
- English, Arabic, Bulgarian, Catalan, Croatian, Czech, Danish, Dutch, Finnish, French, German, Greek, Hebrew, Hindi, Hungarian, Indonesian, Italian, Japanese, Korean, Malay, Norwegian Bokmål, Polish, Portuguese, Romanian, Russian, Simplified Chinese, Slovak, Spanish, Swedish, Thai, Traditional Chinese, Turkish, Ukrainian, Vietnamese
- Age Rating
4+
- 4+
- Contains
Advertising
- In-App Purchases
Yes
- Pro $1.99
- Copyright
- © 2026 Mitsuhiro Hashimoto