Duolingo's retention strategy, explained.

Duolingo's retention strategy, explained.

The streak is what brings people back every day, and it runs on two emotions: achievement and guilt.

After 30 days, a streak stops being a number and becomes part of who you are. So people open the app before midnight to protect it, whether or not they feel like learning.

Leaderboards and friend streaks turn that consistency into status. The principle underneath is loss aversion: people hate losing progress more than they enjoy earning it.

Used carelessly, the same pull turns into guilt, and guilt drives people away.

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