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📚 Learn CSAT English Vocabulary Naturally from Your Lock Screen!
Every time you turn on your phone, a CSAT English vocabulary quiz appears.
Utilize the habit of checking your phone dozens of times a day to naturally memorize English vocabulary.
✨ Key Features

Lock Screen English Vocabulary Quiz
A four-option English vocabulary quiz appears every time you turn on your screen. Answer the correct answer to unlock the device.
6,400+ Essential CSAT Vocabulary Words
We provide carefully selected, core English vocabulary based on analysis of past CSAT exam questions and key English vocabulary textbooks.
Difficulty-Based Learning
Divided into three levels: Easy, Medium, and Hard, you can learn at your own pace.
Incorrect Answer Review System
Incorrect words are automatically saved and repeated. Two consecutive correct answers complete the review!
Learning Statistics
Check the number of words you learned today and build a consistent study habit.
Incorrect Answer Note
Collect only the words you missed for focused review.

📖 Recommended for:

High school students preparing for the CSAT English exam

Students who struggle with memorizing English vocabulary

Those who want to study in spare time

Those who want to memorize English vocabulary consistently every day

💡 Learning Effects
If you check your phone an average of 50 times a day, you'll naturally encounter over 50 English vocabulary words a day.

Over 1,500 times a month! Master CSAT English vocabulary with the power of repetition.
⚙️ Settings

Select word difficulty (Easy/Medium/Difficult)
Set the number of questions (1-3)
Service ON/OFF

🔐 Permissions and Privacy

"Display on top of other apps" permission is required to display the quiz after unlocking.
You can turn the lock screen quiz on or off at any time in Settings.
We do not collect or share any personal information.

Get started now!
Stop forcing yourself to memorize CSAT English vocabulary words.
Build your skills naturally, little by little, every day, right from your lock screen.