Comparison

AI Study Sheet vs 날벼락

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

Head to head
About

AI Study Sheet

Transform existing study materials into active-recall quizzes with AI. Snap photos or import PDFs, and the app automatically masks key terms for spaced repetition. Review materials with an auto-reveal mode that adapts to your learning behavior.

Highlights
  • Import photos and PDFs
  • Automatic AI masking of key terms
  • Review reminders
  • Auto Study Mode with sequential reveal
  • Adaptive learning based on study behavior
  • Organized study material library
  • Flexible material viewing and editing
Features
Read full description

Add your materials. Get support for the whole study routine. Choosing terms to hide, finding the next page to review, tapping to uncover every answer: the small tasks can get in the way of studying. AI Study Sheet helps take care of them. Add photos of your textbooks, worksheets or notes, or import a PDF. AI masks key terms, the app picks pages for review, reminders bring you back, and Auto reveals answers for you. GET STARTED WITH A PHOTO OR PDF AI finds key terms and hides them for practice, without making you mask each one by hand. Text and diagrams stay on the original page. You can edit the masks when needed and use materials you have already prepared for hide-and-reveal study. ANSWERS APPEAR IN 3 SECONDS In Auto mode, the highlighted answer is revealed after 3 seconds. Focus on recalling it instead of tapping through every mask. Prefer your own pace? Use Manual mode. A REMINDER THAT LEADS STRAIGHT TO REVIEW When pages are available to review, tap a reminder to start them in Auto mode. No need to search for the materials or choose a study mode each time. WHAT TO REVIEW NEXT? LEAVE IT TO THE APP Rate each page as remembered, unsure or not remembered. Your ratings and study activity help the app pick your next review pages. Material you know can return after a longer interval, alongside the content that needs more practice. A FRESH LOOK TO HELP YOU FOCUS Version 4.0 redesigns Home, Library, Settings and the study screens, making it easier to start today’s review or continue an unfinished session. Find materials with search and folders, and look back at your study history. Review 3 pages per session by default, or choose 1–10 to suit the time you have. You can also select materials yourself and study them again. SHARE MATERIALS THAT ARE READY TO STUDY Send editable, masked study sheets to friends. Save materials, masks and study history in a backup file and restore them when needed. Sending requires the paid upgrade; receiving is available in the free version. No ads. Complete your first study session to unlock storage for up to 10 pages. A one-time paid upgrade removes the storage limit and unlocks additional paid features. Recognition and masking results vary with your photos and materials. Check and edit them when needed.

About

날벼락

Features
Read full description

숏츠 볼 시간에 영단어 한 장. 날벼락은 자투리 시간마다 꺼내 보는 초경량 영어 표현 암기장입니다. OPIc·토익스피킹·토익에 자주 나오는 핵심 표현과 어휘만 골라, 지하철에서든 카페에서든 3분이면 한 묶음을 훑도록 만들었습니다. 이런 분께 - 미뤄 둔 영어 공부를 오늘부터 다시 시작하려는 분 - 자투리 시간에 핵심 표현만 빠르게 반복하고 싶은 분 - 오픽·토익스피킹·토익을 한 앱에서 준비하고 싶은 분 이렇게 공부합니다 1. 시험을 고르세요 — OPIc · 토익스피킹 · 토익 2. 주제·유형별 표현 목록을 넘겨보며 훑습니다 3. '가리기' 모드로 스스로 점검합니다 (토익은 뜻을, 오픽·토스는 영어를 가립니다) 4. 「복습」으로 지금까지 본 카드만 다시 보고, 퀴즈로 마지막에 확인합니다 담긴 콘텐츠 - 오픽·토익스피킹·토익을 합쳐 영어 표현 5,000개 이상 + 퀵즈 361문항 - 필러·감정·연결어·패턴·주제별 표현, 빈출 어휘·콜로케이션·패러프레이즈, 유형별 전략까지 이런 기능이 있어요 - 발음 듣기 — 표현을 펼치면 [단어]·[예문] 버튼이 나옵니다. 인터넷 없이도 들려줍니다 - 카드 모드 — 좌우로 넘기며 외우고, 뒤집으면 예문과 해석이 함께 나옵니다 - 복습 모드 — 지금까지 본 카드만 다시 봅니다. 최근 3일 / 7일 / 오늘 복습할 것으로 끊어 볼 수 있어요 - 글자 크기 — 보통 / 크게 / 아주 크게 세 단계. 흔들리는 지하철에서도 편하게 - 복습 알림 — 아침에 오늘 복습할 개수를 알려드립니다 (원할 때만 켜세요) 날벼락의 원칙 - 오프라인 100% — 다운로드 후 인터넷 없이 동작합니다 - 완전 무료 — 광고도, 인앱결제도 없습니다 - 로그인·회원가입 없음 — 설치하면 바로 시작, 학습 기록은 기기에 저장되며 개발자 서버로 전송되지 않습니다 - 수집·공유하는 개인정보가 없습니다 가볍게, 방해 없이, 손에 잡히는 3분마다. 지금 설치하고 오늘부터 넘겨 보세요. 문의: lsvuitton0428@gmail.com 개인정보처리방침: https://nalbyeorak.gentilx.com/privacy 본 앱은 학습 보조 도구이며, TOEIC은 ETS의, OPIc은 관련 권리자의 등록상표입니다. 본 앱은 해당 기관과 제휴하거나 승인받은 관계가 아닙니다.

Screenshots

AI Study Sheet4 screens
날벼락4 screens

Verdict

The call

The clearest difference is in-app purchases: 날벼락 at none against AI Study Sheet's 1. On price, update cadence, ads and 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. AI Study Sheet sells 1 one-off in-app purchase. 날벼락 asks for nothing beyond the download.

UpkeepUpdate frequency

AI Study Sheet ships an update every 4 days, 날벼락 every 3 days. The most recent releases landed on October 24, 2026 and October 6, 2026 respectively.

Scorecard1 real difference · 7 level
AI Study Sheet versus 날벼락: the parameters behind the verdict, then further details
ParameterAI Study Sheet날벼락
PriceFreeFree
Positive reviews100.0% of reviews—
Update frequencyEvery 4 daysEvery 3 days — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS16.015.1 — better
Further details — not scored
Size9 MB52 MB
Age rating4+4+
DeveloperMasaki Iinoeunhyeok yang

In-app purchases

1 purchases

AI Study Sheet

One-time1
  • Unlimited Saves$4.99
None

날벼락

No in-app purchases

Questions

Is AI Study Sheet free?
AI Study Sheet is free to download, with in-app purchases available.
Is 날벼락 free?
날벼락 is free to download, with no in-app purchases.
Do AI Study Sheet or 날벼락 have ads?
Neither AI Study Sheet nor 날벼락 shows ads.
Which is updated more often, AI Study Sheet or 날벼락?
AI Study Sheet ships an update every 4 days, and 날벼락 every 3 days. Most recently, AI Study Sheet was updated on October 24, 2026 and 날벼락 on October 6, 2026.

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