Disney.BYJU’S Early Learn App!! If you are thinking of getting this for your kids, there are many things you need to know about this app before you consider buying it. Simply put, it is an online learning program/app designed for kids from nursery to grade 3. Kids can learn math, science, and English in the form of animated videos, games, stories and quizzes. They can also learn concepts of Maths and English through rhymes and Disney songs.