Predict first, then read

What happened at Duolingo?

Make your call before you read the case. Then see the dated outcome, its source, its grades and the psychology behind it.

Duolingo

Round 1 of 1Make your first call

DuolingoReturn

Real case

Duolingo sends millions of daily practice reminders. It built an algorithm that picks the wording of each reminder, without sending a single extra one. Against an already strong baseline, what happened to daily active users?

Nothing measurableUp 0.5%, with new-user retention up 2%Up 15%Down, from notification fatigue

A–D to choose, ↵Enter to lock in

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