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"Hooked" Book
A comprehensive guide exploring the psychological principles and design patterns that drive user engagement and habit formation in digital products
since Jun 16, 2026 · HTTP 200
CohortClass of 2014What it is
A comprehensive guide exploring the psychological principles and design patterns that drive user engagement and habit formation in digital products. Based on behavioral psychology research, this book provides frameworks and real-world case studies for product managers and designers to create products that users naturally return to.
HTTP liveness
9 probes since Jun 16Jun 16Jul 12
AliveHard-dead (404/5xx/parked)RedirectedUnverified (timeout/DNS/block)
Observed events
probes · press · GitHub- Jun 16, 2026First probe — redirectedRedirected offsite
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Pulse Indexobserved activity
9 probes0 pressGitHub –Tranco –
Not enough observed signals for a Pulse Index (needs 2+ signal families).
Cohort survival · Class of 2014weekly
10,235 products launched in 2014 · 99% still active
10,131 active104 sunset
Still active
99%
Median lifespan
4.9y