The Duolingo Growth Framework: Finding Your One Metric That Matters
Learn how to build a retention-segmentation model, run sensitivity analysis to find the highest-impact metric, and design concrete product levers around it — using Duolingo's 4.5x DAU growth turnaround as the working example.
3 sections · 7 lessons
Course outline
Why Copying Mechanics Fails
- The Moves-Counter Mistake: Why Context Matters When Borrowing Features
- The Referral Program That Missed Its Target Audience
Finding the One Metric That Matters
- Segmenting Retention: CURR, NURR, RURR, and SURR
- Sensitivity Analysis: How Duolingo Found Its North Star Metric
Turning a Metric Into Product Levers
- League-Based Leaderboards: Matching by Engagement, Not Friendship
- Protecting the Notification Channel Instead of Just Sending More
- Designing Around the 10-Day Streak Threshold