Duolingo ABC

From the company that gamified language learning for adults comes a reading and writing app for kids ages 3-8 that applies the same addictive streak-and-reward psychology to phonics. Kids trace letters, build words, and read short stories with the familiar Duolingo owl cheering them on. The curriculum was designed by literacy experts and the progression from letter recognition to reading comprehension is remarkably well-paced. Also completely free with no ads.