Luis Von Ahn

We give you these things that are called streak freezes in case you miss a day.

We give you these things that are called streak freezes in case you miss a day.

We do that, but there's a lot of science behind when to give you a streak freeze so as not to cheapen the streak, but actually get you to keep going. So we give you streak freezes. The other thing about the streak that is really important is the notifications. We cannot let you forget to do your Duolingo. And so we have notifications that tell you, hey, you're going to lose your streak.

We do that, but there's a lot of science behind when to give you a streak freeze so as not to cheapen the streak, but actually get you to keep going. So we give you streak freezes. The other thing about the streak that is really important is the notifications. We cannot let you forget to do your Duolingo. And so we have notifications that tell you, hey, you're going to lose your streak.

We do that, but there's a lot of science behind when to give you a streak freeze so as not to cheapen the streak, but actually get you to keep going. So we give you streak freezes. The other thing about the streak that is really important is the notifications. We cannot let you forget to do your Duolingo. And so we have notifications that tell you, hey, you're going to lose your streak.

And there's a lot that goes into what we should say and when we should say it to you so that you don't lose your streak. And at this point, we have a pretty sophisticated, it's basically mostly chosen by AI, you know, when to send the messages. But we also have a very quirky voice. The messages that you get from Duolingo are pretty quirky. And we've A, B tested them like crazy.

And there's a lot that goes into what we should say and when we should say it to you so that you don't lose your streak. And at this point, we have a pretty sophisticated, it's basically mostly chosen by AI, you know, when to send the messages. But we also have a very quirky voice. The messages that you get from Duolingo are pretty quirky. And we've A, B tested them like crazy.

And there's a lot that goes into what we should say and when we should say it to you so that you don't lose your streak. And at this point, we have a pretty sophisticated, it's basically mostly chosen by AI, you know, when to send the messages. But we also have a very quirky voice. The messages that you get from Duolingo are pretty quirky. And we've A, B tested them like crazy.

And they're personalized to you in terms of what works to bring you back. So for some people, we use Gilt. For some people, we use different things and then it really works at bringing you back. So the combination of these two.

And they're personalized to you in terms of what works to bring you back. So for some people, we use Gilt. For some people, we use different things and then it really works at bringing you back. So the combination of these two.

And they're personalized to you in terms of what works to bring you back. So for some people, we use Gilt. For some people, we use different things and then it really works at bringing you back. So the combination of these two.

It ends up being actually quite complicated. But I can tell you some things that we've learned generally. Generally, the time to send in a notification is about 23 and a half hours after you last used Duolingo.

It ends up being actually quite complicated. But I can tell you some things that we've learned generally. Generally, the time to send in a notification is about 23 and a half hours after you last used Duolingo.

It ends up being actually quite complicated. But I can tell you some things that we've learned generally. Generally, the time to send in a notification is about 23 and a half hours after you last used Duolingo.

The way to understand that is if you use Duolingo today at 3 p.m., it probably means you're kind of free at 3 p.m. And likely, you're kind of free tomorrow at 3 p.m. too. Unless it's a weekend. Weekends are a little different. But weekdays... No, you're right. In terms of what to say, I mean, we have found all kinds of things.

The way to understand that is if you use Duolingo today at 3 p.m., it probably means you're kind of free at 3 p.m. And likely, you're kind of free tomorrow at 3 p.m. too. Unless it's a weekend. Weekends are a little different. But weekdays... No, you're right. In terms of what to say, I mean, we have found all kinds of things.

The way to understand that is if you use Duolingo today at 3 p.m., it probably means you're kind of free at 3 p.m. And likely, you're kind of free tomorrow at 3 p.m. too. Unless it's a weekend. Weekends are a little different. But weekdays... No, you're right. In terms of what to say, I mean, we have found all kinds of things.

But, you know, one of the most powerful things we found is many years ago. So we send you a notification. And then if you don't use Duolingo, we send it to you the next day and the next day. After five days of inactivity, we stop sending you notifications because we think, you know, we're not going to spam you forever.

But, you know, one of the most powerful things we found is many years ago. So we send you a notification. And then if you don't use Duolingo, we send it to you the next day and the next day. After five days of inactivity, we stop sending you notifications because we think, you know, we're not going to spam you forever.

But, you know, one of the most powerful things we found is many years ago. So we send you a notification. And then if you don't use Duolingo, we send it to you the next day and the next day. After five days of inactivity, we stop sending you notifications because we think, you know, we're not going to spam you forever.