K-5 Science For Kids - Tappity

Kids simply learn better when they're engaged one-on-one. Which is why we've created Haley the Science Gal. She's with your child every step of the way, from explaining complex science topics and leading real science experiments to encouraging them to try their best. Best of all, the app is 100% interactive, so your child is fully engaged with our curriculum, which is teacher-approved and aligned with science standards.
source

This app let kids engage with learning games and fun experiments to learn faster and better.