Duolingo is a free science-based language education platform created by Luis von Ahn, PhD, and Severin Hacker, PhD. Apple selected it as iPhone App of the Year 2013, Google, as Best of the Best for Android in 2013 and 2014, and TechCrunch dubbed it, Best Education Startup.

In a recent independent study, professors from the City University of New York (CUNY) and the University of South Carolina found that when using Duolingo for 34 hours, students learn the equivalent of one university semester of language instruction. (https://www.duolingo.com/press).

https://www.youtube.com/watch?v=8OebgtUjLg4