I love this app! My 4 going on 5 year old daughter is currently using it. I have worked a lot with her on reading and sounding out words but not so much with adding, subtracting and writing. We started with teach me toddler and teach me kindergarten. She has gone through those and mastered the info and now is at the 1st grade level. When we first started using it the writing portion was a little difficult for her but with time and practice she has gotten the hang of it and enjoys writing outside of the app with great improvement!