FlashSnap vs SmartRedFilter
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
FlashSnap
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Snap your textbook. Hide what you want to learn. That's it. You don't have time to make flashcards from scratch. FlashSnap solves that. Take a photo of any page, brush over the key words with a marker, and your personal study sheet is ready in seconds. The familiar paper red-sheet method, now on your phone — with a little extra intelligence. What you can do 【Photo Sheet】 Photograph textbooks, notebooks, or any printed material. Cover important words with red, blue, or green markers. During study, the markers hide the answers — tap to reveal. 【Classic Cards】 Front-and-back cards with images or text. Perfect for vocabulary or matching pairs. 【Text Cards】 Simple Q&A format. Great for formulas, definitions, or quick facts. 【Spaced Repetition (SM-2)】 The cards you remember well come back later. The ones you struggle with come back soon. Backed by proven memory science. 【Exam Forecast】 Set your exam date and FlashSnap calculates whether you're on pace to finish. Warnings appear if you're falling behind, so you can adjust early. 【Weak Cards Highlight】 The cards you keep missing are surfaced automatically. Focus your review where it matters. 【Vertical Writing Support】 For Japanese classical texts, Chinese, or right-to-left content. Reading order follows the natural top-to-bottom, right-to-left flow. Who is this for? ・Students preparing for exams ・Nursing & medical students learning terminology ・Language learners (vocabulary, classical texts) ・Anyone using paper red-sheet study method ・People who want to know "will I finish in time?" ・Commuters making use of small pockets of time Privacy first ・No account required ・Your photos and study data stay on your device ・Nothing is uploaded to any server ・No tracking for ads (npa=1)
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
Screenshots
Verdict
The clearest difference is ads: FlashSnap 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. FlashSnap sells 1 one-off in-app purchase and SmartRedFilter sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
| Parameter | FlashSnap | SmartRedFilter |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 weeks | — |
| Ads | No — better | Yes |
| In-app purchases | Yes | Yes |
| Devices | iPhone | iPhone, iPad — better |
| Requires iOS | 17.0 | 17.0 |
| Further details — not scored | ||
| Size | 2 MB | 11 MB |
| Age rating | 4+ | 4+ |
| Developer | torankirite | Mitsuhiro Hashimoto |
In-app purchases
FlashSnap
- Premium$3.99
SmartRedFilter
- Pro$1.99





