i vs WordMasking Lite
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.
WordMasking Lite
This app helps you memorize words and sentences by masking them with drawing lines. It supports various file imports, including images and PDFs, and offers features like automatic adjustment and batch masking. Results are recorded and editable, with support for both iPhone and iPad.
- Masking words/sentences with drawing lines
- Image and PDF file import
- Color-coded masking line based on accuracy
- Automatic adjustment for PDF masking
- Batch masking via search function
- Result recording and editing
- Folder-based book management
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You can study to memorize words or sentences by masking them with drawing line. √ Image file, pdf available √ Color of masking line changes basing correct answer percentage √ Assist to draw for masking by automatic adjustment (when use pdf) and angle fixing √ Can execute batch masking using searching function (when use pdf) ◉File Import *From cloud storage (using iOS File app) *From iOS Photos app or camera in device ◉Result *Result is recorded per the masking *Editable results ◉Other *Support iPhone and iPad *Support portrait and landscape mode *Can manage books (created in this app) using folder ◉Attention *Cannot synchronize between devices using iCloud (Can restore backup data using Dropbox)
Screenshots
Verdict
The clearest difference is rating: WordMasking Lite at 4.8 against i's 4.2. WordMasking Lite also leads on review sentiment (72% vs 43%) and iOS requirement (14.0 vs 18.0). i's advantage is update cadence (every 6 days vs fortnightly). On price, ratings volume, ads and in-app purchases 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. i sells 10 one-off in-app purchases and WordMasking Lite sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
WordMasking Lite holds the better App Store score, 4.8 against 4.2. Both are backed by a comparable volume of ratings — 10 and 6 respectively. Written reviews point the same way: 43% of i's written reviews are positive against 72% of WordMasking Lite's.
i ships an update every 6 days, WordMasking Lite fortnightly. The most recent releases landed on October 26, 2026 and October 29, 2026 respectively.
| Parameter | i | WordMasking Lite |
|---|---|---|
| Price | Free | Free |
| Rating | 4.2 (10 ratings) | 4.8 (6 ratings) — better |
| Positive reviews | 42.9% of reviews | 72.2% of reviews — better |
| Number of ratings | 10 — better | 6 |
| Update frequency | Every 6 days — better | Fortnightly |
| Ads | Yes | Yes |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 18.0 | 14.0 — better |
| Further details — not scored | ||
| Size | 67 MB | 12 MB |
| Age rating | 4+ | 4+ |
| Developer | BrainApp LLC | Akira Takahashi |
Customer experience
i
WordMasking Lite
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
WordMasking Lite
- Remove advertisements$1.99








