Real apps.
Real decisions.
Each case study documents what actually happened: the decisions made, the mistakes committed, and what was achieved. No spin.
Cal AI
health & fitness
How a calorie tracking app built by a 17-year-old reached #1 on the App Store through TikTok distribution
Airbnb
travel & hospitality
How Airbnb validated the most counterintuitive idea in hospitality with a hand-coded website and an air mattress
Revolut
fintech
How Revolut launched with one feature, dominated a market, and then expanded — not the other way around
Lime
mobility
How Lime captured city contracts and market share before competitors by moving faster and asking for forgiveness
Cooltra
mobility
How Barcelona's scooter sharing company built technology that matched real operational complexity
AppBlock
productivity
How a simple app blocker became a profitable bootstrapped business by solving one problem very well
Hevy
health & fitness
Hevy hit #1 in the App Store Health category by doing less than every competitor — and making the social layer feel earned, not forced
Strava
health & fitness
Strava grew to 120M users by refusing to expand beyond serious athletes for the first five years — the discipline of not scaling your audience
Duolingo
education
How a single gamification mechanic — the daily streak — turned language learning from a chore into the stickiest habit on the App Store
CapCut
creative tools
How ByteDance turned TikTok's creator ecosystem into a free distribution engine for a video editing app that no one asked for — and everyone needed
Locket Widget
social
How a ridiculously simple idea — live photos from friends on your home screen — went viral because it was native to iOS and did exactly one thing perfectly
Superhuman
productivity
How an email client charging $30 per month — 30 times what most apps charge — built a waitlist of tens of thousands by making waiting feel like privilege
BeReal
social
How a single notification mechanic created the fastest-growing social app of 2022 — and why viral growth without retention loops is not a business
Flo Health
health & fitness
How a women's health app reached a $1 billion valuation by charging for something every competitor gave away free — privacy — at exactly the right moment
Perplexity AI
AI / search
How an AI search startup reached $100M+ ARR in 18 months by doing the one thing Google could not — giving a direct answer without ads, without blue links, with sources
Character.AI
AI / social
How an AI companion app built higher engagement than TikTok — because the retention loop was a relationship, not a content feed
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