Duolingo English Test (DET) and Strategies to Pass the Test – Affordable English School in Los Angeles
How to Create a Language Learning App [The Ultimate Guide!] - Belitsoft
Is Duolingo Good? A Duolingo Review + Better Language Apps for Travel
Game of Tongues: How Duolingo Built A $700 Million Business With Its Addictive Language-Learning App
Duolingo, the (ineffective) number one language learning app in the world that is making millions!, by Céline Guerreiro
12 months of Duolingo plus normally cost more than 2 times 6 months so either there is a permanent discount or r/theydidntdothemath is leaking : r/assholedesign
11 Duolingo Tips Most Users Don't Know About • Happily Ever Travels
Duolingo Plus Gave Fans of Free App a Cost Worth Paying - Bloomberg
Duolingo: What do we really want from this popular, ineffective app?