Lenny's Newsletter • 9571 implied HN points • 28 Feb 23
- Duolingo achieved 4.5x user growth over four years through innovative strategies like leaderboards and push notifications.
- Their focus on improving retention over new user acquisition led to significant improvements in engagement metrics.
- Using data and models, like Zynga and MyFitnessPal did, helped Duolingo identify North Star metrics and drive growth effectively.