i vs E
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- Hide text with red filter effect
- Study photos and PDFs
- Add check marks for progress
- Efficient study with navigation
- Use anytime, anywhere
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【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.
E
Organize and visualize information by joining round plates into rings. Add text, photos, videos, and illustrations to plates, then structure them into themes. Plates can be displayed in 3D and enlarged for presentations.
- Add media to round plates
- Join plates into rings for themes
- Structure plates by associating with other rings/plates
- 3D plate display
- Enlarge plates and flick through content
- Presentation mode
- Share via AirDrop
- Import/export data via iTunes
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E-VOLVOX is an application that supports classification, organization and structuring of information. By joining rings to round plates you can multiply and therefore categorise and re-organise, or reduce cut off to create a different ring. It can also be re-structured by moving the layer of rings and plates. 〈The main features〉 ・You can add letters, photos, videos, handwritten letters and illustrations, etc. to a round shaped plate. ・The plates can be joined together into a ring, and one ring can be treated as one theme or topic. ・Each plate can be structured by associating to another ring or plate. ・The plate can become a 3D display, making it easier to understand the structure. ・You can exagerate the plate, so that a larger image can be displayed. Also, in the case of a ring, you can move to the next or previous plate by 'flicking'. A single sheet display can be made from any plate. ・As you can display the plate in a larger size and move to the next with a 'flick', you can also use this function to make a presentation. ・Using AirDrop, you can send not only plates, rings, boards, but also photos and text boxes. ・By exporting data, you can bring in data from iTunes. You can also load data retrieved from other terminals via iTunes. This application is developed in collaboration between Professor Hitoshi Nakagawa at The Open University of Japan) and Suzuki Educational Software Co., Ltd. ● For public Hitoshi Nakagawa (The Open University of Japan, Professor) Recently, various 'thinking' tools/ have been talked about, especially, mapping and Venn diagrams; simple things that are getting used often in class. However, there are not so many tools available for structural understanding of the upper and lower concepts, as this is hard to originate. Therefore, under the tablet terminal environment, we have developed and released applications that can be utilized for organization, classification, structuring and explanation of information in the class, from Suzuki Educational Software. Its name is "E-VOLVOX". VOLVOX is a green single-celled organism which forms free-swimming spherical colonies. It was named because this application resembles its shape and structure. It is possible to advance by trial and error in various learning situations, and it is also possible to present new forms of information and activities in a not related times series. More easy to explain in basic terms, but this is not a simple application. However, I believe you will have enough information to be useful to visualize and capture what we are thinking, and send it to the world. I Hope you will try it! [Please try it!]
Screenshots
Verdict
The clearest difference is price: i at Free against E's $9.99. i also leads on update cadence (every 6 days vs every 3 months) and review sentiment (43% vs 33%). E's advantage is in-app purchases (none vs 10) and ads (none vs shown). On device support 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
i is free to download; E costs $9.99 up front. i sells 10 one-off in-app purchases. E asks for nothing beyond the download.
i ships an update every 6 days, E every 3 months. The most recent releases landed on October 15, 2026 and June 4, 2026 respectively.
| Parameter | i | E |
|---|---|---|
| Price | Free — better | $9.99 |
| Rating | 4.2 (10 ratings) — better | — |
| Positive reviews | 42.9% of reviews — better | 33.3% of reviews |
| Number of ratings | 10 — better | — |
| Update frequency | Every 6 days — better | Every 3 months |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases — better | Paid |
| Devices | iPhone, iPad — better | iPad |
| Requires iOS | 18.0 | 12.0 — better |
| Further details — not scored | ||
| Size | 67 MB | 174 MB |
| Age rating | 4+ | 4+ |
| Developer | BrainApp LLC | Suzuki Educational Software Co.,Ltd. |
Customer experience
i
E
In-app purchases
i
- i-Memorize Sheet Remove ADs Option$0.99
- imc00010$0.99
- imc00020$0.99
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- 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
E
No in-app purchases









