Biokid by Shubho

Here is a description you can paste directly: BioKid teaches kids human biology the way they actually want to learn it. Each topic starts with a short story that puts biology in context, followed by a timed quiz that tests what they just read. Earn XP, build streaks, collect stars, and unlock new levels as you go. The app covers the major systems of the human body, from the brain and nervous system to the heart, lungs, and digestive tract. Every lesson is self-contained, so kids can pick up wherever they left off without losing progress. BioKid is completely free. No ads, no accounts, no in-app purchases. Everything runs on your device, nothing is collected or sent anywhere. Parents can hand it to their kid and walk away. Built by Shubho Biotech, a student-led nonprofit focused on science education.