How the best products grow on autopilot
Teardowns of how Duolingo, Netflix, and Tinder capture, activate, and retain customers - and the lessons you can apply to yours.
12 case studies
How Duolingo Turned a Streak Into a Habit Engine
The psychology behind the green owl's streaks, reminders, and loss aversion that keep millions learning daily.
Why Tinder's Onboarding Removes Every Possible Excuse
Tinder gets users to their first 'aha' moment in seconds by stripping friction down to a single swipe.
How Netflix Personalizes Its Way to Your Next Click
Netflix's artwork, rows, and recommendations are all engineered to shorten the gap between opening the app and pressing play.
Spotify Wrapped: The Annual Referral Loop in Disguise
Spotify Wrapped turns private listening data into public, shareable identity - and free acquisition every December.
TikTok's Feed: Engineered to Learn You Fast
TikTok's For You page reaches relevance faster than any feed before it by optimizing for one signal: watch time.
How Headspace Builds a Meditation Habit in 10 Days
Headspace's onboarding sets a tiny, achievable commitment and celebrates progress to turn beginners into daily users.
How Airbnb Designs Trust Between Strangers
Airbnb's reviews, photos, and host profiles lower the perceived risk of staying in a stranger's home.
LinkedIn's Profile Meter: A Masterclass in Nudging
The profile completion meter uses the goal-gradient effect to pull users toward a fully filled-out profile.
How Robinhood Turned a Waitlist Into a Growth Engine
Robinhood's pre-launch waitlist used position-jumping referrals to acquire a million users before launch.
Amazon's 1-Click: Removing the Last Inch of Friction
Amazon's patented 1-Click checkout shows how removing a single step can unlock enormous revenue.
How Calm Frames Its Free Trial to Convert
Calm reduces the anxiety of a paid subscription by being transparent about the trial and reminding users before they're charged.
How Uber Reduced the Anxiety of Waiting
Uber's live map and ETAs replaced the uncertainty of hailing a cab with reassuring, real-time feedback.