Duolingo, Inc. is a technology company. The Company is engaged in offering a mobile learning platform, as well as a digital English language proficiency assessment exam. It operates a freemium business model, namely, the app and the Website are accessible free of charge, although Duolingo also offers premium services for a subscription fee. Its solutions consist of the Duolingo App, Super Duolingo, Duolingo Max, Duolingo English Test: AI-Driven Language Assessment, Duolingo for Schools, and Duolingo ABC. The Duolingo App offers courses in over 40 different languages, including Spanish, English, French, German, Italian, Portuguese, Japanese and Chinese. Duolingo can also be accessed on desktop computers via a Web browser. Its subscription offering, Super Duolingo, offers learners additional features to enhance their learning experience. The Duolingo English Test is an online, on-demand, high-stakes English proficiency assessment. It also operates an animation and motion design studio.