Lingokids

Toca Boca World is a massive open-ended play space where kids create characters, decorate homes, run shops, explore locations, and make up their own stories. No goals, no scores, no "right way" to play. Free download with some locations. Subscription or location packs unlock more. Ages 4-9. Over 100M downloads. The digital equivalent of an infinite playset.

Gives you 5 personalized activities per day with step-by-step video: motor, language, cognitive, social. Live expert classes on breastfeeding, sleep, development. Free: 3 activities/week + milestone tracker + 650 articles. Premium adds full catalog, progress reports, 1:1 coaching, up to 5 kids. Similar to BabySparks but covers pregnancy through age 6 (BabySparks stops at 3). More "what to do with your baby" than "what did your baby do."

Khan Academy Kids is completely free - no ads, no subscriptions, no premium tier. Ages 2-8. Covers reading, writing, language, math, and social-emotional learning through interactive games, books, songs, and activities. From the nonprofit behind Khan Academy. If you're looking for one educational app to install and forget about paying for, this is it.