SmartRedFilter vs Answer Hider
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SmartRedFilter
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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
Answer Hider
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Answer Hider is a simple study app that helps you organize exam materials, hide answers in study photos, and review them before a test. Add photos of worksheets, notes, printed handouts, vocabulary lists, or problem sets. Then hide the answers or key terms you want to memorize. Tap to reveal the answer, mark it as difficult or correct, and focus your review on what you need to remember. ■ Recommended for ・Students who study from printed worksheets ・Hiding answers and reviewing them like flashcards ・Organizing range sheets and study photos separately ・Preparing for midterms, finals, and regular exams ・Studying from notes, handouts, and problem sets ・Keeping exam materials organized by subject or course ■ Main features ・Organize by exam period ・Organize by subject or course ・Separate range sheets from study photos ・Manually hide answers in photos ・Tap to reveal hidden answers ・Mark answers as difficult, correct, or removed ・Review only difficult items ・Modes for school and college use ・No ads, so you can stay focused ■ Free plan The core hide-and-review flow is available for free. The free plan includes up to 30 photos and 1 exam period. ■ Premium Premium unlocks unlimited photos and unlimited exam periods. Choose a 30-day pass, a 60-day pass, or Lifetime Pro. 30-Day and 60-Day Passes are non-renewing and do not auto-renew. Lifetime Pro is a one-time purchase. ■ Privacy This app does not show ads. It does not use external AI or automatic answer generation. Your study photos and exam materials are not uploaded to an external server. ■ Terms of Use (EULA) https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ ■ Privacy Policy https://docs.google.com/document/d/e/2PACX-1vQM37OvTcHoNAevOTIl5I1Tt3hE3vktVhNAJ63hYVhcMYRbg3_ItqM2wfe1CZg8X_xACNQheT7HYuDl/pub Study from your own photos. Hide answers, reveal them, and review what you missed.
Screenshots
Verdict
The clearest difference is ads: Answer Hider at none against SmartRedFilter's shown. On price, in-app purchases, device support and iOS requirement 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. SmartRedFilter sells 1 one-off in-app purchase and Answer Hider sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.
| Parameter | SmartRedFilter | Answer Hider |
|---|---|---|
| Price | Free | Free |
| Ads | Yes | No — better |
| In-app purchases | Yes | Yes |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 17.0 | 17.0 |
| Further details — not scored | ||
| Size | 11 MB | 5 MB |
| Age rating | 4+ | 4+ |
| Developer | Mitsuhiro Hashimoto | Yuya Takamoto |
In-app purchases
SmartRedFilter
- Pro$1.99
Answer Hider
- 30-Day Pass$1.99
- 60-Day Pass$3.99
- Lifetime Pro$11.99
Questions
Is SmartRedFilter free?
Is Answer Hider free?
Do SmartRedFilter or Answer Hider have ads?
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