그레이트북스 is an educational and reference app available on the Android platform. It offers a range of digital content for children, including videos, music, and product-related materials. With a total of 19 collections, 360 videos, and 724 streaming music options, users can access a wide variety of content. The app also provides parenting guides for some of their products.

One of the key features of 그레이트북스 is the ability to access content without the need for physical books or CDs. Users can authenticate their purchased products and enjoy the corresponding videos and music anytime and anywhere. The app includes a player with features like full-screen, select, and repeat playback options for convenient viewing. Users can also create playlists of their favorite content and enjoy continuous playback. Additionally, the app allows users to scan QR codes in textbooks to access related videos and music. For users of 그래그래 products, they can connect the app to the 그래펜 device via Bluetooth and enjoy videos by tagging the icons on the back cover of each book.

Furthermore, 그레이트북스 offers additional features to enhance the user experience. Parents can manage their child's daily viewing time, receive personalized content recommendations based on their child's age and preferences, and explore various benefits such as content coupons and parenting guides through the app settings.

Please note that the app requires Android 7.0 (Nougat) or above to function properly.