YTK Animals: Nat Geo Kids, The Cincinnati Zoo & Botanical Garden, Animal Wonders Montana, San Diego Zoo, BBC Earth Kids YTK General: PBS Kids (collection of 5 channels), Sesame Studios (collection of 6 channels), Khan Academy Kids, Bluey, Deep Look, PBS Space Time, TheDadLab, Super Sema, Mystery Doug, Brainzy Games, The Kiboomers To be decent, you must curate the content yourself (rather than the algorithm) so you have to find and add 'channels' or even individual videos, and remove them when they are outgrown. YouTube Kids is a free streaming service/app that can be terrible or decent. I have no concerns letting my kid loose in the kids area to choose among that content. It has a walled-off kids area with movies, shows, and videobooks that are not garbage. Kanopy is a streaming service/app that is freely available through many libraries. Common Sense Media rates/reviews media for quality and age-appropriateness. Sensical is a free streaming service/app that only includes content that meet Common Sense Media criteria. PBS Kids has at least two free apps: one video streaming, and one educational games.