Prepar is a web-based and mobile app that uses AI to personalize the learning experience for each user. It is a paid subscription service, but it offers a free trial. Users can upload their study materials, such as textbooks, notes, and presentations, and the AI will create a personalized study plan that includes a detailed breakdown of the topics that the user needs to review, as well as the best time to review each topic. Prepar also provides users with a variety of tools to help them study more effectively, such as flashcards, quizzes, and practice tests. The app also tracks the user's progress and provides feedback to help them stay on track. Prepar is a powerful tool that can help students of all levels improve their study habits and achieve their academic goals.