Question 1

What are the key takeaways from Jackson Shuttleworth's episode on Lenny's Podcast?

Accepted Answer

1. Streaks only work as a retention mechanic when layered on top of a product users genuinely care about -- the engagement hack amplifies existing value, it doesn't create it from nothing. 2. The zero to seven day streak window is critical: once users hit a seven-day streak, loss aversion kicks in and retention flattens dramatically, making early streak-building the highest leverage work. 3. Duolingo runs 600+ experiments on streaks over four years, with half failing -- the philosophy is to test cheaply and constantly, especially copy changes, rather than debating endlessly. 4. Simplifying the streak from XP-based goals to one-lesson-per-day was a massive DAU driver, but going further to one-exercise was too simple -- finding the right unit of use is the key to streak design. 5. Adding an opt-out button to streak goals was counterintuitively a huge win because user intentionality in choosing to commit drives stronger retention than forced engagement.

Question 2

What does Jackson Shuttleworth say about retention and experimentation?

Accepted Answer

"Streaks are a great engagement hack. I'm of the opinion that any team, any app out there can introduce a streak, and if you figure it out, it probably works to retain users, but at the core, you have to have an app that people want to use. It allows us to layer an engagement mechanic on top that is really powerful." - Jackson Shuttleworth "One of the most impactful experiments we ran was to move it from an XP based streak to just do one lesson a day, and you'd extend your streak. The unit of use for Duolingo is doing a lesson. And so, if what we care about is users coming back every day and doing a lesson, it doesn't hurt us to make our streak focus on just do one unit versus multiple." - Jackson Shuttleworth "The easiest way not to learn on Duolingo is not to come back the next day. And so, if we don't make the app retentive, you will have no opportunity to engage with our learning features. Streaks work best when they're sitting on top of an app that users care about." - Jackson Shuttleworth

Question 3

What are Jackson Shuttleworth's views on retention, experimentation, streaks?

Accepted Answer

Jackson Shuttleworth: "Streaks are a great engagement hack. I'm of the opinion that any team, any app out there can introduce a streak, and if you figure it out, it probably works to retain users, but at the core, you have to have an app that people want to use. It allows us to layer an engagement mechanic on top that is really powerful." Jackson Shuttleworth: "One of the most impactful experiments we ran was to move it from an XP based streak to just do one lesson a day, and you'd extend your streak. The unit of use for Duolingo is doing a lesson. And so, if what we care about is users coming back every day and doing a lesson, it doesn't hurt us to make our streak focus on just do one unit versus multiple."

Jackson Shuttleworth

Behind the product: Duolingo streaks | Jackson Shuttleworth (Group PM, Retention Team)

TRANSCRIPT

Jackson Shuttleworth

Behind the product: Duolingo streaks | Jackson Shuttleworth (Group PM, Retention Team)

Jackson Shuttleworth

Behind the product: Duolingo streaks | Jackson Shuttleworth (Group PM, Retention Team)

TRANSCRIPT

Jackson Shuttleworth

Behind the product: Duolingo streaks | Jackson Shuttleworth (Group PM, Retention Team)