The Great Courses is an educational app for iPhone that allows users to access courses they have purchased from the company. The app provides an easy way to stream video or audio lectures and access course guidebooks. With more than 800 courses available, The Great Courses brings top professors from around the world to millions of users who want to learn more about their favorite subjects.

The app is easy to use and allows users to seamlessly switch between video and audio versions of lectures. It also provides the option to download lectures for offline viewing. While an internet connection is required to stream lectures, downloaded lectures can be accessed anytime, anywhere. Please note that the app only includes digital editions purchased directly from The Great Courses and not those purchased from other retailers.

Overall, The Great Courses app is a great resource for anyone looking to deepen their knowledge in a variety of subjects. It provides a convenient way to access courses and learn from some of the world's top professors.