Duolingo is a platform that includes a language-learning website and app, as well as a digital language proficiency assessment exam.

Duolingo uses the freemium model; the app and the website are accessible without charge, although Duolingo also offers a premium service for a fee.

Duolingo was launched in Nov 30, 2011, by Luis von Ahn and Severin Hacker, and publicly release on Jun 19, 2012. The company is headquartered in Pittsburgh, Pennsylvania, with offices in New York; Bellevue, Washington and Beijing, China.

Duolingo is on a mission to bring free language education to the world, we’re building a future in which the highest-quality education is accessible to all.

Duolingo's approach is simple — language learning should be fun, personalized, and based on science. As of November 2019 the language-learning website and app offer 94 different language courses in 23 languages. The app has over 300 million registered users across the world.


Duolingo has added to the growth from its core language-learning app with new products, including podcasts for Spanish and French learnings, and Duolingo Events, which connect language learners in person around the world.


Duolingo is backed by Alphabet’s CapitalG, Kleiner Perkins Caufield Byers, Union Square Ventures, New Enterprise Associates and others. The company raised $30M from a Series F financing on Dec 04, 2019. This new round brings Duolingo's total funding to $138.8M. 


Duolingo has received a whooping $1.5B valuation from the latest Series F round on Dec 04, 2019. Hence it becomes the first tech unicorn in Pittsburgh, Pennsylvania. The company was also listed in 2019: CNBC Disrupter 50 list, named 2018's Inc. Best Places to Work and Entrepreneur Top Company Culture List. They were also named in The World's Most Innovative Companies by Fast Company in 2018, 2017 and 2013.



  • Year founded: 2011
  • Funding Info: $138.8M over 6 Rounds (Latest Funding Type: Series F)
  • Yearly Revenue: $20M-$30M (2019)
  • Employee Size: 501-1000
  • Business Valuation: Valued at $1.5B as of Dec 04, 2019
  • City/Town: Pittsburgh
  • State: Pennsylvania
  • Country: United States
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