Comparison

Red Sheet vs retention+

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

Head to head
About

Red Sheet

Features
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Choose what you want to learn. AI creates a study sheet you can use immediately with the red sheet in the same app. From creating materials to memorizing them, the whole flow stays in one place. You can also create study sheets from photos of study materials and worksheets. Your existing textbooks, notes, photos, scans, and PDFs still work with the red sheet. CREATE WITH AI - Generate 20 study items by choosing a topic - Set a level for middle school, high school, exams, or qualifications - Create study sheets from photos of materials, worksheets, and notes - Enter your own content when you prefer HIDE AND MEMORIZE - Switch between red, green, and blue sheets - Adjust sheet opacity - Choose text removal or black masking - Move the sheet with your finger to check answers USE YOUR OWN MATERIALS - Study with the live camera - Import photos and PDFs or scan pages - Add markers, pen strokes, and text - Export as PDF or images Premium and Premium AI are auto-renewable subscriptions. Payment is charged to your Apple Account at confirmation. Subscriptions renew unless canceled at least 24 hours before the end of the current period. Manage or cancel them in your App Store account settings. Terms of Use: https://redsheet-3a6-7xe.pages.dev/en/terms/ Privacy Policy: https://redsheet-3a6-7xe.pages.dev/en/privacy/

About

retention+

Features
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retention+๋Š” ๋ฐฐ์šด ๋‚ด์šฉ์„ ๋‚˜๋งŒ์˜ ๋ฌธ์ œ๋กœ ๋งŒ๋“ค์–ด ๋ณต์Šตํ•˜๊ณ , ๋‹ค๋ฅธ ์‚ฌ๋žŒ๋“ค๊ณผ ๋ฌธ์ œ๋ฅผ ๋งŒ๋“ค์–ด ํ•จ๊ป˜ ํ’€์–ด๋ณผ ์ˆ˜ ์žˆ๋Š” ํ•™์Šต ์•ฑ์ž…๋‹ˆ๋‹ค. ๋ฌธ์ œ ๋งŒ๋“ค๊ธฐ โ€ข ๊ฐ๊ด€์‹, ์ฃผ๊ด€์‹, ์„œ์ˆ ํ˜•, ์„  ์—ฐ๊ฒฐ, ์ˆœ์„œ ๋ฐฐ์—ดํ˜• ๋“ฑ ๋‹ค์–‘ํ•œ ๋ฌธ์ œ ์œ ํ˜•์œผ๋กœ ์Šค์Šค๋กœ ํ’€ ์ˆ˜ ์žˆ๋Š” ๋ฌธ์ œ๋ฅผ ๋งŒ๋“ค๊ณ , ์ด๋ฅผ ๋ฌธ์ œ์ง‘์œผ๋กœ ๋ชจ์•„๋ณด์„ธ์š”. โ€ข ์‚ฌ์ง„, ๋™์˜์ƒ, GIF๋ฅผ ์ฒจ๋ถ€ํ•  ์ˆ˜ ์žˆ์œผ๋ฉฐ, ํ‘œ๋ฅผ ์ด์šฉํ•ด ๋ณด๋‹ค ์„ธ๋ฐ€ํ•˜๊ฒŒ ๋ฌธ์ œ๋ฅผ ์ œ์ž‘ํ•  ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค. โ€ข ๋งŒ๋“ค์–ด๋‚ธ ๋ฌธ์ œ์ง‘์€ ์—ฐ์Šต, ์‹ค์ „, ํƒ€์ž„์–ดํƒ ๋“ฑ ๋‹ค์–‘ํ•œ ํ•™์Šต ๋ชจ๋“œ๋ฅผ ์„ ํƒํ•ด ํ’€์–ด๋ณผ ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค. ๊ธฐ์–ต ์œ ์ง€๋„์— ๋งž์ถ˜ ๋ณต์Šต โ€ข ํ•™์Šต ๊ธฐ๋ก์„ ๋ฐ”ํƒ•์œผ๋กœ ๋ฌธ์ œ๋ณ„ โ€˜๊ธฐ์–ต ์œ ์ง€๋„โ€™๋ฅผ ๊ณ„์‚ฐํ•ฉ๋‹ˆ๋‹ค. ์›ํ•˜๋Š” ๊ธฐ์–ต ์œ ์ง€๋„์— ์•Œ๋ฆผ์„ ๋งž์ถ”๊ณ  ๋ณต์Šตํ•ด๋ณด์„ธ์š”. ๊ทธ๋ฃน ์Šคํ„ฐ๋””๋ฃธ โ€ข ์Šคํ„ฐ๋””๋ฃธ์„ ๋งŒ๋“ค๊ฑฐ๋‚˜, ์ดˆ๋Œ€ ์ฝ”๋“œ๋ฅผ ํ†ตํ•ด ๋น„๊ณต๊ฐœ ์Šคํ„ฐ๋””๋ฃธ์— ๋“ค์–ด๊ฐˆ ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค. ์Šคํ„ฐ๋””๋ฃธ ์•ˆ์—์„œ ๋ฌธ์ œ๋ฅผ ๋งŒ๋“ค๊ณ , ๊ณต์œ ํ•ด๋ณด์„ธ์š”. ๋ชจ์˜๊ณ ์‚ฌ โ€ข ๊ทธ๋ฃน ์Šคํ„ฐ๋””๋ฃธ ์•ˆ์—์„œ ๋ฌธ์ œ๋ฅผ ๋งŒ๋“ค๊ฑฐ๋‚˜, ์ž์‹ ์ด ๋งŒ๋“  ๋ฌธ์ œ๋ฅผ ์—…๋กœ๋“œํ•ด ๋ชจ์˜๊ณ ์‚ฌ๋ฅผ ๋ณผ ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค. ์‹ค์ „ ๋ฐฉ์‹๊ณผ ๊ฐ™์ด ์‹œ๊ฐ„์„ ์„ค์ •ํ•  ์ˆ˜ ์žˆ๊ณ , ์Šค์Šค๋กœ ์ฑ„์ ํ•ด๋ณด๊ฑฐ๋‚˜ ์„œ๋กœ ๊ตํ™˜ํ•ด ์ฑ„์ ํ•ด๋ณผ ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค. ๊ฐœ์ธ ๋ฌธ์ œ์ง‘์€ iCloud๋ฅผ ํ†ตํ•ด ์—ฌ๋Ÿฌ ๊ธฐ๊ธฐ์—์„œ ๋™๊ธฐํ™”ํ•  ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค. ์Šคํ„ฐ๋”” ๊ทธ๋ฃน๊ณผ ์ผ๋ถ€ ํด๋ผ์šฐ๋“œ ๊ธฐ๋Šฅ์—๋Š” Apple ๋กœ๊ทธ์ธ ๋ฐ iCloud ๋กœ๊ทธ์ธ์ด ํ•„์š”ํ•ฉ๋‹ˆ๋‹ค. ๋ฌด๋ฃŒ๋กœ ์‹œ์ž‘ํ•˜๊ณ , ํ•„์š”ํ•˜๋‹ค๋ฉด retention+๋ฅผ ๊ตฌ๋…ํ•ด ๋ฌธ์ œ์ง‘๊ณผ ์Šคํ„ฐ๋”” ๊ทธ๋ฃน ์ œํ•œ ์—†์ด ์ด์šฉํ•ด๋ณด์„ธ์š”. ์ด์šฉ์•ฝ๊ด€(Terms of Use): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Red Sheet4 screens
retention+4 screens

Verdict

The call

The clearest difference is ads: retention+ at none against Red Sheet's shown. On price, update cadence, in-app purchases and device support there is nothing between them.

Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS

CostPrice ยท In-app purchases ยท Ads ยท Monetization

Both are free to download. Red Sheet sells 1 in-app purchase, starting at $2.99 per year and retention+ sells 10 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 4 days. The most recent releases landed on October 5, 2026 and October 10, 2026 respectively.

Scorecard1 real difference ยท 5 level
Red Sheet versus retention+: the parameters behind the verdict, then further details
ParameterRed Sheetretention+
PriceFreeFree
Update frequencyEvery 4 daysEvery 4 days
AdsYesNo โ€” better
In-app purchasesYesYes
DevicesiPhone, iPadiPhone, iPad
Requires iOS18.017.6 โ€” better
Further details โ€” not scored
Size180 MB23 MB
Age rating4+4+
DeveloperN-Verse LLCWONYEONG NA

In-app purchases

1 purchases

Red Sheet

Subscriptions1
  • Red Sheet-kun Premium Annual$2.991 Year
10 purchases

retention+

Subscriptions2
  • retention+ ์›”๊ฐ„ ๊ตฌ๋…$0.991 Month
  • retention+ ์—ฐ๊ฐ„ ๊ตฌ๋…$9.991 Year
One-time8
  • Developer Support I$0.49
  • Developer Support II$1.99
  • Developer Support III$2.99
Show 5 more
  • Developer Support IV$5.99
  • Developer Support V$9.99
  • Developer Support VI$17.99
  • Developer Support VII$34.99
  • Developer Support VIII$69.99

Questions

Is Red Sheet free?
Red Sheet is free to download, with in-app purchases available.
Is retention+ free?
retention+ is free to download, with in-app purchases available.
Do Red Sheet or retention+ have ads?
Red Sheet shows ads; retention+ does not.
Which is updated more often, Red Sheet or retention+?
Red Sheet ships an update every 4 days, and retention+ every 4 days. Most recently, Red Sheet was updated on October 5, 2026 and retention+ on October 10, 2026.

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