Like and follow if you enjoyed the content!

I reverse-engineered Duolingo to figure out how they get 50 million people to use the app. And it starts with a folder I found called Churn, where they calculate one number about you every single day, the odds you'll come back tomorrow. To figure this out, Duolingo collects the following information. Whether you opened the app from a notification, widget, or icon, how many lessons you did today, how many answers you've gotten wrong, and even whether the app crashed since you

last opened it. But knowing the odds only matters if they can do anything about it. And that means reaching you at the right moment. Duolingo tracks your Wi-Fi, it fingerprints the networks you've connected to, and counts how many days you've been on each one. This way, they can detect whether you're likely at home before they send certain notifications.

On top of that, they even track whether your phone was on silent when the notification came in. And if you've turned notifications off, they pitch you to turn them back on based on whatever they've calculated you care about the most. So a friend's progress, a spot on the leaderboard, or even your own streak. So none of their attention is luck.

Let me know in the comments what app I should do next.

Let me know in the comments what app I should do next.