Duolingo

Duolingo, Inc.
	Duolingo home page visited while logged out in March 2024
Type of business	Public
Available in	Multilingual Arabic ; Bengali ; Chinese (Mandarin) ; Czech ; Dutch ; English ; French ; German ; Greek ; Hindi ; Hungarian ; Indonesian ; Italian ; Japanese ; Korean ; Polish ; Portuguese ; Romanian ; Russian ; Spanish ; Swedish ; Tagalog ; Tamil ; Telugu ; Thai ; Turkish ; Ukrainian ; Vietnamese ;
Traded as	Nasdaq: DUOL (Class A); S&P 400 component;
Founded	2011
Headquarters	Pittsburgh, Pennsylvania, U.S.
Area served	Worldwide
Founders	Luis von Ahn; Severin Hacker;
Key people	Luis von Ahn (CEO); Severin Hacker (CTO)
Industry	Online education
Products	Duolingo; Duolingo ABC; Duolingo English Test;
Services	Language, 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)
URL	duolingo.com
Advertising	Yes
Registration	Yes
Users	130 million MAU (Q1 2025)
Launched	November 27, 2011 (private beta); June 19, 2012 (public release)
Current status	Online
Native client(s) on	Android, iOS, iPadOS

Duolingo, Inc. is an American educational technology company that produces learning apps and provides language certification. Duolingo offers courses on 42 languages, ranging from English, French, and Spanish to less commonly studied languages such as Welsh, Irish, and Navajo, and even constructed languages such as Esperanto and Klingon. It also offers courses on music, math, and chess. The learning method incorporates gamification to motivate users with points, rewards and interactive lessons featuring spaced repetition. 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.