Comparison

i vs RedSheetCamera

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

i

This app allows users to hide text in study materials using a filter, mimicking a red sheet for effective memorization. It supports photos and PDFs, enabling studying anytime, anywhere with just a smartphone.

Highlights
  • Hide text with red filter effect
  • Study photos and PDFs
  • Add check marks for progress
  • Efficient study with navigation
  • Use anytime, anywhere
Read full description

【Ranked #1 in the Education category (free)】 【Over 1 million downloads】 Featured in various media: ・Fuji TV "Minna no News (2017/2/9)": Red-sheet generation stunned! A revolution in memorization methods ・Benesse Manapla: Make high school life even more fun! 3 useful apps ・Nikkei Trendy Net "TODA Satoru’s Deep-Dive Report on Gadgets": How working adults use iPad and handwriting apps for learning i-Memorization Sheet is an app for memorization study that hides words, sentences, dates, etc. using a filter so you can study them. The app uses image analysis to reproduce the same effect as using a real red filter. Therefore, red text in reference books can be hidden simply by photographing it. You can also import entire reference books by converting them to PDF. With just an iPhone, you can study anytime, anywhere. 【Benefits of i-Memorization Sheet】 - Study anytime, anywhere—e.g., easily memorize with one hand on the train. - Carry as many pages as you want just by bringing your smartphone. - Disappears better than real red sheets. All reddish colors are hidden. Green is fine if it's a fluorescent highlighter. - You can add check marks anywhere. Double-tap where you want to place a mark. There is also a function to jump to the next check mark, making studying very efficient. 【Supported materials】 - Photos and PDFs can be used. 【Pricing】 You can use the app for free for up to 10 pages in total. If you want to use more files/pages, please purchase an add-on. Ads are displayed, but purchasing the add-on can disable them.

About

RedSheetCamera

This study support app uses your camera to hide key information in your notes or textbooks. It then facilitates active recall practice to strengthen retention for exams, language learning, and certifications.

Highlights
  • Camera-based review of learning material
  • Adjustable information visibility
  • Uninterrupted study flow with simple controls
  • Supports consistent daily review
  • Active recall practice
Features
Read full description

# RedSheetCamera Memorize faster. Study smarter with a digital red sheet. ## Overview RedSheetCamera is a study support app designed to make memorization more efficient. Just point your camera at your notes or textbook, hide key information, and switch to active recall practice. It helps strengthen retention in situations where repetition matters, such as exams, language learning, and certifications. ## Great for - School tests and entrance exam preparation - Memorizing university notes and technical terms - Repeated practice for vocabulary and language phrases - Qualification and certification exam study - Remembering presentation or speech content ## Key Features - Quickly review learning material through the camera view - Adjust visibility to match your study style - Simple controls that keep your study flow uninterrupted - Designed to support consistent daily review ## Notes - This app is a tool to support learning. - For the best results, combine continuous repetition with understanding-based study. Use RedSheetCamera to make daily memorization more effective.

Screenshots

i3 screens
RedSheetCamera1 screens

Verdict

The call

The clearest difference is ads: RedSheetCamera at none against i's shown. i's advantage is update cadence (every 6 days vs every 15 months). On price, review sentiment, in-app purchases and monetization model 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. i sells 10 one-off in-app purchases and RedSheetCamera sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

i ships an update every 6 days, RedSheetCamera every 15 months. The most recent releases landed on October 22, 2026 and October 24, 2026 respectively.

Scorecard2 real differences · 8 level
i versus RedSheetCamera: the parameters behind the verdict, then further details
ParameteriRedSheetCamera
PriceFreeFree
Rating4.2 (10 ratings) — better—
Positive reviews42.9% of reviews42.9% of reviews
Number of ratings10 — better—
Update frequencyEvery 6 days — betterEvery 15 months
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad — betteriPhone
Requires iOS18.017.0 — better
Further details — not scored
Size67 MB9 MB
Age rating4+4+
DeveloperBrainApp LLCtaishin miyamoto

Customer experience

i

All ratings10 ratings
Positive90.0%
Neutral0.0%
Negative10.0%
Written reviews77 reviews
Positive42.9%
Neutral10.4%
Negative46.8%

RedSheetCamera

Written reviews14 reviews
Positive42.9%
Neutral14.3%
Negative42.9%

In-app purchases

10 purchases

i

One-time10
  • i-Memorize Sheet Remove ADs Option$0.99
  • imc00010$0.99
  • imc00020$0.99
Show 7 more
  • i-Mem-Contents imc00030$0.99
  • i-Mem-Contents imc00040$0.99
  • i-Mem-Contents imc00010$0.99
  • i-memorize Sheet File-Limit release add-on$2.99
  • i-memorize Sheet PDF page-Limit release add-on$4.99
  • Pro licence(campaign)$5.99
  • i-memorize Sheet Limit release add-on$6.99
1 purchases

RedSheetCamera

One-time1
  • RedSheetCamera - Remove Ads$1.99

Questions

Is i free?
i is free to download, with in-app purchases available.
Is RedSheetCamera free?
RedSheetCamera is free to download, with in-app purchases available.
Do i or RedSheetCamera have ads?
i shows ads; RedSheetCamera does not.
Which is updated more often, i or RedSheetCamera?
i ships an update every 6 days, and RedSheetCamera every 15 months. Most recently, i was updated on October 22, 2026 and RedSheetCamera on October 24, 2026.

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