Nir Eyal Hook Model Trend 2026

The Hook Model, developed by Nir Eyal, is a four-phase framework—Trigger, Action, Variable Reward, and Investment—that explains how digital products build strong user habits. This psychology-driven cycle encourages repeated engagement by addressing user needs and creating anticipation. Product designers, marketers, and growth teams use the model to boost retention and loyalty. Ultimately, businesses aiming for sustainable user adoption and daily active usage benefit most from applying this strategic engagement loop.