Real apps.
Real decisions.
Each case study documents what actually happened: the decisions made, the mistakes committed, and what was achieved. No spin.
UnRespiro
mental health
How a Spanish startup validated mental health demand before writing a single line of code
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
Flamaid
health technology
Building a regulated health platform in Spain — the compliance, tech, and trust challenges that define the category
Went
fintech / travel
How localizing for Spanish user behavior created a loyal user base in a market dominated by global players
VIB3S
music & events
How a Spanish startup built the go-to app for festival-goers — starting with zero users and zero budget
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
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