How Duolingo uses streaks and notifications to keep users coming back to the app; 5M of Duolingo's 30M+ DAUs have one year streaks and 70% have weeklong streaks (Ben Cohen/Wall Street Journal)

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Ben Cohen / Wall Street Journal:
How Duolingo uses streaks and notifications to keep users coming back to the app; 5M of Duolingo's 30M+ DAUs have one year streaks and 70% have weeklong streaks  —  The learning app doesn't just teach languages.  It harnesses the power of streaks and hooks you with perfectly timed nudges.

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