Duolingo

Duolingo, Inc.
Duolingo home page visited while logged out in March 2024
Type of businessPublic
Available in
Multilingual
Traded as
Founded2011 (2011)
HeadquartersPittsburgh, Pennsylvania, U.S.
Area servedWorldwide
Founder(s)
  • Luis von Ahn
  • Severin Hacker
Key peopleLuis von Ahn (CEO)
Severin Hacker (CTO)
IndustryOnline education
Products
  • Duolingo
  • Duolingo ABC
  • Duolingo English Test
ServicesLanguage, music, chess, and math courses and language assessment.
Revenue US$748 million (2024)
Operating income US$63 million (2024)
Profit US$88.6 million (2024)
Total assets US$1.3 billion (2024)
Total equity US$825 million (2024)
Employees≈ 830 (December 2024)
URLduolingo.com
AdvertisingYes
RegistrationYes[a]
Users130 million MAU (Q1 2025)
LaunchedNovember 27, 2011 (2011-11-27) (private beta)
June 19, 2012 (2012-06-19) (public release)
Current statusOnline
Native client(s) onAndroid, iOS, iPadOS
[1][2][3][4]

Duolingo, Inc.[b] is an American educational technology company that produces learning apps and provides language certification. Duolingo offers courses on 43 languages,[5] ranging from English, French, and Spanish to less commonly studied languages such as Welsh, Irish, and Navajo, and even constructed languages such as Klingon.[6] It also offers courses on music,[7] math, and chess.[8] The learning method incorporates gamification to motivate users with points, rewards and interactive lessons featuring spaced repetition.[9] The app promotes short, daily lessons for consistent-phased practice.

Duolingo also offers the Duolingo English Test, an online language assessment, and Duolingo ABC, a literacy app designed for children. The company follows a freemium model, where some content is provided for free with advertising, and users can pay for ad-free services which provide additional features.


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  1. ^ "Duolingo, Inc. 2024 Annual Report (Form 10-K)". U.S. Securities and Exchange Commission. February 28, 2025. Retrieved March 2, 2025.
  2. ^ "Migrating Duolingo's Android app to 100% Kotlin". blog.duolingo.com. April 6, 2020. Archived from the original on December 23, 2020. Retrieved September 17, 2020.
  3. ^ "Real World Swift – Making Duolingo Blog". making.duolingo.com. January 7, 2015. Archived from the original on June 6, 2019. Retrieved October 22, 2018.
  4. ^ "Rewriting Duolingo's engine in Scala – Making Duolingo Blog". making.duolingo.com. January 31, 2017. Archived from the original on August 4, 2019. Retrieved February 1, 2017.
  5. ^ Matt (February 20, 2023). "The Complete List Of EVERY Duolingo Language". Duoplanet. Archived from the original on September 21, 2022. Retrieved September 21, 2022.
  6. ^ Higgins-Dunn, Noah (April 14, 2019). "If you are a 'Game of Thrones' fan, this app will teach you how to speak in High Valyrian". CNBC. Archived from the original on November 12, 2019. Retrieved May 23, 2022.
  7. ^ Ortiz, Sabrina. "Duolingo opens waitlist for its new, free music course. Here's how to sign up". ZDNET. Archived from the original on October 12, 2023. Retrieved October 11, 2023.
  8. ^ Duolingo Team (October 26, 2022). "Duolingo Math makes learning easy as pi(e)". Duolingo. Archived from the original on October 27, 2022. Retrieved October 27, 2022.
  9. ^ "Dear Duolingo: Why is spaced repetition so important for learning?". Duolingo Blog. December 26, 2023. Retrieved August 2, 2024.
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