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About this app

"I don't even have enough time for Korean, English, and Math, so when on earth am I supposed to study memorization subjects?"

This is a dilemma every middle school student faces. History, science, social studies... there is a mountain of material to memorize, yet nothing remains in your head after the exam. Even the content you painstakingly memorized vanishes surprisingly cleanly after just a few days.

The problem isn't that you are "bad at remembering." It is because the human brain is designed that way.

■ Why do we keep forgetting? — The Ebbinghaus Forgetting Curve

According to research by German psychologist Ebbinghaus, people forget about 70% of what they have memorized within just one day. This means that you can never retain information for long after memorizing it just once.

However, conversely, if you review the material again at "that very moment" when you are likely to forget, your memory strengthens rapidly. If you repeat this process a few times, the content transfers into long-term memory with just a short investment of time, making it difficult to forget. This is the power of "Spaced Repetition," proven by learning science worldwide.

■ Daldal Amgi Calculates Your 'Review Timing' for You

The problem is that it is nearly impossible for students to keep track of the optimal review timing on their own.

Daldal Amgi remembers every single problem you have solved and selects and displays only the "problems you need to solve again right now," based on the forgetting curve. Problems you know well appear less frequently, while problems you keep getting wrong appear more often. This allows you to efficiently memorize only what is absolutely necessary without wasting time.

For each concept, the time you will encounter it again is indicated in stages.

Intensive → 1 Day → 3 Days → 1 Week → 2 Weeks → 1 Month → Verification

If you get it right, you move up one stage; if you get it wrong, you move down one stage and it appears more frequently.

■ 10 Minutes a Day: Memorization Subjects Now Automatic

You must stick to the time you need to focus on Korean, English, and Math. For memorization subjects, just 10 minutes during your commute to and from school, during breaks, or before bed is enough. Even if you solve just a little bit every day—only the problems selected by Daldal Amgi—the exam scope will automatically accumulate in your mind.

■ Recommended for these students

- Students who keep forgetting even after memorizing everything

- Students who lose too much time on memorization subjects

- Students exhausted from cramming right before exams

- Students who find the time spent organizing error notes by hand a waste

- Students who are at a loss as to what to review during midterm and final exam periods

■ Three Modes

- Memorization Mode — Memorize key concepts by unit while solving problems
- Exam Mode — Select a unit and practice with exam-style questions
- Personal Mode — Create and solve problems again using photos of exam papers or printouts

■ Error Notes Are Managed Automatically

Questions answered incorrectly in Exam Mode are automatically added to the error notes. There is no need to copy them down or take photos. - Questions are presented starting with the most frequently missed questions.

- If you solve a question again in your error notebook and get it right twice in a row, it will be automatically removed from the list.

- If you get a question wrong once in the middle, the consecutive count resets to 0.

■ Same Concepts in Four Types

True/False · Parentheses · Backhanded Parentheses · Conceptual Type

For concepts learned for the first time, you must pass all four types to advance to the next level.

Since questions in the review section avoid the types that appeared immediately before, you cannot pass by simply memorizing the answers.

■ 'Complete' with Numbers

Progress Rate, Proficiency, and Review Cycles are displayed for each unit.

Passing all concepts in a unit once marks completion, and reaching the 2-week level or higher marks mastery.

■ Automatically Changes When Exam Dates Are Entered

If you enter the dates for midterms or final exams, starting 14 days before the exam,

the system will switch to focusing on reviewing what has already been learned rather than introducing new concepts.

■ Parent Account

By creating a separate parent account and linking your child, you can check their learning progress.

School rankings are also displayed based on the linked child's school.

There is no need to purchase a dedicated tablet or study device; your existing smartphone will suffice.

■ Key Features
- Automatic repetition based on the forgetting curve — The app selects questions for review

- Automatic error note management — Questions are automatically removed from the list after two consecutive correct answers

- AI teacher explanations — Kindly explains the reasons for errors by subject

- School rankings — Ranked by school, not individual; friends are on the same side, not competitors

- DalCredits — Accumulate as you study and redeem them for Premium

■ Subjects to Study

History · Social Studies · Science · Technology & Home Economics · Ethics · Hanja · Korean · English

Korean Grammar · English Grammar added in July 2026

Selecting a grade in the app switches to questions for Middle School 1, 2, or 3. ■ Pricing

Free — Memorization Mode: Up to 80% per unit; Test Mode: 10 questions per day

Basic: 9,900 KRW/month (89,000 KRW/year) — Unlimited access to all subjects; Completion/Master rating; Re-testing of incorrect answers; Personal Mode: 5 times per month

Premium: 16,900 KRW/month (149,000 KRW/year) — All of Basic + Personal Mode: 20 times per month; 20 printouts per month; Parent Dashboard

You can try it for free first before deciding.

Memorization is not a talent, but a matter of 'timing'.

Until the day studying becomes sweet, "Daldal Memorization" is with you.

Inquiries: [e-mail]

Website: https://daldal.ai.kr

What’s new

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· 매일 올라오는 미션을 확인하고 「미션 완료」로 인증
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