Cephadex allows users to create custom learning materials and tests from a variety of inputs. - Select input from various formats such as pdfs, ppts, docs, mp3s, wikipedia pages, or youtube videos. - Transform input into custom cards stored in decks. - Create worksheets and tests using custom decks. - Utilize a spaced repetition system and other study tools to master subjects. - Join a community offering educational games, challenges, progress tracking, and goal setting.