Duolingo (DUOL)

The core Duolingo app offers free language lessons supported by advertising, while paid subscriptions such as Super Duolingo remove ads and add features intended to improve the learning experience. The company also operates the Duolingo English Test, an online English proficiency exam used by institutions and learners as a digital alternative to traditional language assessments. Other products extend the brand into education categories such as early literacy through Duolingo ABC and mathematics through Duolingo Math.

Duolingo’s revenue comes primarily from subscriptions, advertising, the English Test, and in-app purchases. Its freemium model allows it to attract a large user base before converting a portion of learners into paying customers. The company’s product strategy relies heavily on experimentation, machine learning, and frequent app updates, using learner behavior data to refine lessons, notifications, difficulty levels, and monetization.

As a listed technology company, Duolingo stands out for combining consumer internet dynamics with education. Its recognizable brand, mobile-first design, and use of AI-driven personalization give it a distinctive role in the language-learning market. The business is global, but it reports revenue from the United States and international markets, reflecting broad demand for accessible, low-cost digital education.