Hooked
How to Build Habit-Forming Products
The four-step Hook Model behind products people use without thinking.
Hooked lays out the Hook Model, a four-phase cycle of trigger, action, variable reward, and investment that explains how successful products build user habits. Drawing on behavioral psychology and case studies from companies like Twitter and Instagram, Eyal shows how to design experiences that keep customers coming back. The book is part playbook and part ethical caution about engineering compulsion.
Founders building consumer or SaaS products need users to return without paid prompting, and the Hook Model gives a concrete framework for designing that retention. It reframes engagement as something you can deliberately build rather than hope for, while flagging the ethical line between habit and manipulation.
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