Let’s talk about Duolingo – the most popular language learning mobile app, with over 500 million downloads on Google Play Store. I originally downloaded Duolingo and made my account in 2016, but only used it sporadically for a few years, until one August day in 2019, when I started the streak that lasts until today. I recently reached the milestone of completing at least one lesson a day every day for 5 years! Here are my thoughts about learning languages on Duolingo.