LessonUp is a web-based interactive lesson platform that integrates slides, images, videos, websites, maps, quizzes, and open-ended questions. Teachers can present lessons in class, with students participating on student devices, or assign lessons to students for independent work. Students participate in a web browser on any type of internet-connected device. During the lesson, teachers can annotate on the screen and choose whether or not to cast their screen to student devices. In order for data to be collected and saved, students must log in to LessonUp using their email address or an auto-generated username. A differentiation feature lets teachers color-code slides to offer extra practice or create custom paths. Lessons can also be assigned to specific students instead of the whole class. Teachers can share lessons with each other via a link or by posting them in the LessonUp library.