# 스마트 오답노트 - 스터디노트 암기 복습 플래너 > Error Note App — Take a picture of a question to erase your notes, and the forgetting curve review asks you again. Flashcards, a study planner, and weakness analysis all in one. Canonical page: [https://chrome-stats.com/d/com.xrabbit.studynote](https://chrome-stats.com/d/com.xrabbit.studynote) ## Overview - **ID:** `com.xrabbit.studynote` - **Platform:** Android - **Type:** Android app - **Status:** Available - **Publisher:** M-Rabbit - **Category:** EDUCATION - **Downloads:** 2 - **Last updated:** 2026-09-09 - **First published:** 2026-08-06 - **Publisher country:** KR - **Data as of:** 2026-09-11 - **Store listing:** [Google Play Store](https://play.google.com/store/apps/details?id=com.xrabbit.studynote) - **Website:** [https://studynote.justgets.com](https://studynote.justgets.com/) - **Privacy policy:** [https://studynote.justgets.com/privacy](https://studynote.justgets.com/privacy) ## Description ■ Preventing Your Error Note from Becoming a Photo Album

If you simply take a picture of a problem you got wrong, you won't open it again after a few days.

That is because your solution and the correct answer are already written there, making it impossible to solve the problem again.

Study Note erases ballpoint pen and highlighter marks the moment you take a photo, leaving only the printed problem.

It becomes an error note that you can solve again as if you were seeing the problem for the first time, even if you open it months later.

The original is preserved even after erasing, allowing you to switch between it on the screen at once.

■ The App Decides When to Review — Forgetting Curve Review

Review timing is automatically calculated based on the forgetting curve (SM-2) interval.

✗ Got it wrong again → Try again tomorrow

△ Got it right by chance → Increase the interval slightly

◯ Completely understood → Review it one more time much later

Since each button shows you "when it will appear next" in advance,

you are less likely to press any button and move on.

The number of problems to review today is displayed as a number on the home screen. ■ One line is enough to explain why you got it wrong

If you simply write "sign error," it is automatically classified as a calculation error; if you write "didn't know this formula," it is automatically classified as a concept gap.

· Calculation error · Concept gap · Confusion · Lack of time · Missed condition

Statistics accumulated by cause tell you what needs to be addressed right now.

Solving time and the number of times you got it wrong again are also reflected.

■ Try explaining — A comprehension check that doesn't reveal the answer

If you explain the solution verbally or in writing, the app points out the missing links in your explanation instead of revealing the correct answer.

It identifies parts you skipped over with the excuse of "just memorizing" or steps you moved on from without justification, and asks you to clarify.

You can also explain as if you were speaking via voice input.

■ Weakness Heatmap — See where you are leaking at a glance

It displays the error rate for the last 4 weeks by color for each unit.

Tapping a red box collects only the incorrect answers for that unit and starts a retest immediately. Instead of vaguely thinking "I'm weak in math," you can narrow down your study to specific areas, such as "Calculus Week 3."

■ Study Planner — Review automatically populates your spare time

If you add fixed schedules like academies, private tutoring, or school, today's review is automatically scheduled for the empty time slots in between.

It calculates the time to avoid schedule overlaps and increases the intensity of your review as the exam approaches.

If you register multiple D-days, they are displayed sequentially at the top of the home screen.

■ Flashcards · Handwritten Notes

Lines written in the memo format in the "Term — Meaning" format are automatically converted into flashcards.

Using the [[Blank]] notation creates a fill-in-the-blank card.

Handwritten notes are saved in the same notebook, and palm touches are automatically ignored when using a stylus.

Flashcards are also managed using the same forgetting curve schedule as incorrect answers.

■ Personalized Mock Exam PDF

Select only your incorrect answers and create a printable test paper. Select the number of questions, subjects, and time period to combine questions based on error counts and relevance.

Self-assessment notes are attached separately on the back. Print it out and solve the problems as if it were a real exam.

■ Throughput Timer

It records the actual number of problems solved, not the time spent sitting.

Since the average time per problem is displayed, you can decide whether to increase your study time or speed.

■ Photos Do Not Leave the Device

Captured problems, handwriting, and memo text are not transmitted to a server but are stored only on the device.

Handwriting removal and weakness analysis are also calculated entirely within the device.

Photography, review, and statistics function as usual even in Airplane Mode.

You can export them as backup files to transfer them seamlessly even if you switch devices.

■ Suitable for:

· Those tired of creating error notes for the CSAT, school exams, and mock exams

· Those struggling because the answer is visible every time they solve practice problems

· Those who find it cumbersome to use separate memorization apps, error notes, and study planners

· Those who need to repeatedly review past exam questions, such as for civil service exams or certification exams

■ How to use it by subject

· Math — By erasing incorrect calculation steps and solving the problem again, you will never move on with the answer simply memorized.

· English — Turn grammar and vocabulary errors into flashcards and review them during spare time.

· Korean — By categorizing and recording the causes of grammar errors (confusion, missed conditions), you can identify the question types.

· Korean History/Social Studies — Gather only the questions classified as having "concept gaps" and review them by unit.

· Civil Service/Certification — The more you review past questions for an exam, the greater the effect of "erased questions."

■ Key Features at a Glance

· Automatic removal of ballpoint pen and highlighter marks after capturing the error (including a strong mode that erases even pencil marks)

· Tilt correction
· Automatic margin cropping

· Forgetting Curve (SM-2) based retest schedule, preview of next review date

· Automatic classification of incorrect answer causes and statistics by cause

· Unit × 4-week weakness heatmap, retest immediately by tapping a box

· Comprehension check using "Explain" (voice input supported)

· Study planner that automatically schedules reviews during gaps between fixed schedules

· Register multiple exam D-days and auto-cycle

· Handwritten and typed notes, automatic generation of flashcards with "Term — Meaning" lines

· Create mock test PDFs based on your incorrect answers

· Throughput timer recording the number of questions solved

· Backup file export/restore, dark mode, tablet screen support

■ FAQ

Q. Can answers written in pencil be erased?

A. Colored colors such as ballpoint pens and highlighters are erased reliably. Pencils are erased using the strong mode, but

some residue may remain in workbooks with light print. The original is always stored together.

Q. Can I use it without an internet connection? A. Photography, handwriting removal, review, statistics, and the planner all operate within the device.

You can use it as is even in Airplane Mode.

Q. What should I do if I change devices?

A. If you export the backup file in Settings and restore it on a new device, your incorrect answers and photos will be transferred together.

Q. Are photos uploaded to the server?

A. No. Photos, handwriting, and the body of notes are not transmitted.

Only anonymous installation identifiers and usage counts are collected.

■ 3 Minutes to Create an Incorrect Answer Notebook

1. Take a photo of the incorrect problem.

2. Only the problem with your handwriting erased remains (the original is kept together).

3. Write just one line explaining why you got it wrong.

4. Starting tomorrow, the app will automatically ask you again.

The time spent cutting, pasting, and rewriting by hand disappears.

You can use that time to solve the problem one more time.

■ How It Makes It Different

· Unlike apps that only store photos, you can erase handwriting and save it in a "ready-to-resolve" state.

· You don't have to set review dates yourself — the next schedule is determined with a single grading button.

· It records "why you got it wrong" rather than just the number of incorrect answers, leaving a record of what needs to be corrected.

· Incorrect answers, flashcards, and the planner all operate under the same schedule within a single app.

■ Screen and Convenience Features

· On tablets, the left-hand menu + 2-column layout provides a spacious layout.

· Supports Dark Mode for comfortable viewing at night.

· Follows system font size settings and does not reduce text size even on small screens.

· Notifications remind you of today's review at a set time every day (can be turned on and off).

■ Free / Pro

Free: Saves 30 incorrect answers · Forgetting Curve Retest · Statistics · Planner · Memo · Flashcards

Pro: Unlimited incorrect answer storage · Unlimited mock test PDFs · AI summary cards · No ads

※ This app is a learning aid and does not guarantee grades or passing. ※ The results of handwriting removal may vary depending on the lighting, handwriting color, and print density of the original photo.

※ Please use photos of workbooks and test papers for personal study purposes only.

Privacy Policy: https://studynote.justgets.com/privacy

Terms of Use: https://studynote.justgets.com/terms

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