KORON is an iPhone learning service designed to help users pass the police exam in Japan. It can be used in conjunction with the magazine "Keisatsu Kojin" to provide comprehensive learning management, including weak area strategies and more. The app offers a variety of learning methods, including multiple-choice questions, true/false questions, audio books, and charts.

One of KORON's standout features is its "Weakness Strategy" function, which automatically accumulates incorrect answers during the learning process and allows users to review and improve their understanding of these areas. The "Performance" radar chart allows users to easily see their proficiency in each field and compete with other users in rankings. Additionally, the "Today's Training" function provides daily questions, allowing users to learn over 1,000 questions in a year.

KORON offers a variety of learning services, including 50 practical SA questions, audio books for learning the basic four laws, and electronic versions of true/false question collections with over 500 questions. This app is recommended for those who want to make effective use of their free time, manage their learning comprehension, and compete with colleagues and other examinees nationwide.