디북 - 올인원 문제집 앱 is an educational and reference app developed by CHUNJAE TEXTBOOK CO.LTD. It is available for iPhone and is free to download.

This app serves as a reliable study companion, offering a wide range of features to enhance your learning experience. With 디북, you can easily download and study from various problem sets directly on your smart device. The app also provides a handwriting service, allowing you to take notes directly on the problem sets using different pens.

One of the standout features of 디북 is its screen split function, which allows you to view both the problem and its solution simultaneously. This makes it easier to understand and study the solutions while working through the problems.

디북 offers over 400 problem sets for elementary, middle, and high school students. It includes popular educational materials from 천재교육, such as the 초등 우등생 해법 시리즈, 수학 리더 시리즈, 중학 체크체크 시리즈, and 고등 셀파 시리즈. The app plans to continuously add more materials in the future.

With 디북 - 올인원 문제집 앱, you can have all your study materials in one place. Start studying with 디북 today and make your learning journey lighter and more convenient.

Thank you.

※ Access Permissions Information

[Optional Access Permissions]

• Notification: Used to receive new message notifications.

※ You can use the app even if you do not agree to the optional access permissions.

[How to Revoke Access Permissions]

• Settings > 디북 > Select the desired permission > Select Agree or Revoke
• Settings > Privacy and Security > Select the desired permission > Select the app > Select Agree or Revoke