Duolingo 

Duolingo Inc is a technology company that develops a mobile learning platform to learn languages. Its products are powered by sophisticated data analytics and artificial intelligence and delivered with class art, animation, and design to make it easier for learners to stay motivated, master new material, and achieve their learning goals. Its solutions include the Duolingo Language Learning App, Super Duolingo, Duolingo English Test: AI-Driven Language Assessment, Duolingo For Schools, Duolingo ABC, and Duolingo Math. It has four predominant sources of revenue: time-based subscriptions, in-app advertising placement by third parties, the Duolingo English Test, and In-App purchases. Geographically, the company generates revenue from its customers in the United States and other markets.