Session: How Does Duolingo Drive Growth At Scale Without Losing Speed Or Quality?
summary
Duolingo reports 50+ million daily active users and over 10 million learners with a 365+ day streak, and attributes growth to thousands of AB tests driven by an in‑house experiments team and a multi‑armed bandit copy selector. A copy change from “5 minutes” to 3 minutes boosts DAU and total engagement. A streak‑repair experiment swaps a paid gem flow for a free challenge, halving that purchase revenue but raising retention. Process notes: mini product review 15‑minute approvals and internal dogfooding.
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chapters (12)
- 0:00Duolingo’s growth story
- 1:26Speaker and mission
- 2:08User growth over time
- 3:33Green Machine testing
- 4:35Case study: Notifications copy
- 6:43Case study: Streak flexibility
- 8:49Growth experiments best practices
- 11:15Compounding impact of improvements
- 13:05Quality via product review
- 15:34Tools for rapid experiments
- 16:35Data versus creativity
- 17:40Q&A
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