Duolingo ABC – Learn to Read
Ages 3–5. Duolingo's children-only spinoff. 700+ phonics-aligned mini-lessons across reading, writing, listening, and speaking. Truly free with no IAP and no ads — the company funds the kid version off the adult Duolingo subscription pool, which means the kid product genuinely has nothing to upsell. Common Sense Media age-4+ rating; no privacy red flags in the App Privacy label. The right pairing for a kid who's also reading print books — the app isn't enough on its own, but it's a strong complement.