Duolingo

Duolingo operates a dual revenue model: an ad-supported free tier that serves the majority of users, and a paid "Super Duolingo" subscription that removes ads and adds features. The company also sells the Duolingo English Test to institutions as a certified proficiency exam. In Q1 2024, subscription bookings accounted for roughly 80% of total revenue, with advertising and the English Test contributing the remainder.

No. Duolingo is an operating company, not an investment vehicle. The firm's capital is deployed entirely into its own product development, marketing, and operations. There is no disclosed external investment portfolio, venture arm, or fund-of-funds allocation.

Luis von Ahn's research at Carnegie Mellon focused on human computation — using human cognitive surplus to solve problems computers could not. That same principle underlies Duolingo: free users generate translation and training data while learning, which improves the product for all users. Von Ahn's earlier CAPTCHA work (sold to Google) funded the company's earliest research phase.

Duolingo listed on Nasdaq in July 2021 under the ticker DUOL. Luis von Ahn retains majority voting control through Class B shares carrying 20 votes each, while public investors hold Class A shares with one vote. This dual-class structure insulates the company's free-access mission from activist pressure.

As a Nasdaq-listed company, Duolingo discloses quarterly results under SEC regulation. In full-year 2023, the company reported $531 million in total revenue, 6.6 million paid subscribers at year-end, and approximately 88 million monthly active users. These metrics make it the largest standalone consumer language-learning business globally by user count.

There is no publicly disclosed private foundation or donor-advised fund attributed to Duolingo as a corporate entity. The company frames its core free product as its primary social mission — delivering language education to hundreds of millions at zero cost — rather than maintaining a separate philanthropic vehicle.

Duolingo offers courses in more than 40 languages, including endangered and constructed languages like Navajo, Hawaiian, and High Valyrian. In addition to the flagship app, the company operates Duolingo English Test, Duolingo Math (a separate iOS app launched in 2022), and Duolingo ABC, a free literacy app for children aged 3–8.