Duolingo has between 300 million and 1.2 billion users worldwide ... it looks like the day after a demo to listen to the unions and the police give us figures! What is certain is that Duolingo has quickly become the most popular language learning app. The reason is due to its objective since its creation: to offer a fun and personalized learning while remaining accessible to all. How does Duolingo work? In the English version, there are an incredible number of languages, from the most classic to Navajo or Swahili! For us French speakers, Duolingo offers 5 languages: English, Spanish, German, Italian or Portuguese. Whatever the language, Duolingo allows you to learn vocabulary and a little grammar through quick exercises, sequenced in series, on a fairly fun and easy to use interface. Learn English or Spanish with Duolingo We tested the app for English and Spanish to find out which languages we speak differently, and to see if the positives or negatives were proven in multiple languag...