Khan Academy Kids

Completely free. No ads. No subscriptions. No in-app purchases. Khan Academy Kids is the most generous educational app ever made, covering reading, math, social-emotional learning, and creative expression for ages 2-8. The adaptive learning engine adjusts difficulty based on each child's performance, and the cast of animal characters (Kodi the bear, Ollo the bird) keeps kids engaged without resorting to dopamine-farming tactics. Sal Khan gave the world free education; this app starts that mission at birth.