Even if this was free it would not be worth it. Essentially they show the same 25 pictures over and over and that is considered trivia. Trivial not trivia. I love dinosaurs but hate this app. Just avoid for your own sanity. You have been warned.
My grand son is four and loves learning about the different dinosaurs. He has a short attention span like most little boys and used this app a lot longer then I expected. I recommend it to children who are a year older. It was nice to see how much he learned. Mrs. Kanter