Habit-forming products (the Hook)
In one sentence
Products become habits through a loop: trigger, action, variable reward, investment.
The simple version
Nir Eyal's Hook Model explains why you open certain apps without thinking. Something triggers you, you take an easy action, you get a reward that's a bit unpredictable, and you invest something (data, effort) that makes the next loop better.
Why it matters
Products people use out of habit need less marketing and keep customers longer.
How to do it
- 1Trigger: what prompts use — a notification, or a feeling like boredom?
- 2Action: make the simplest possible action.
- 3Variable reward: give something useful that varies (new messages, new content).
- 4Investment: ask users to put something in (photos, settings, followers).
- 5Check ethics: does this habit actually help the user?
Real-world example
A language app: a daily reminder (trigger), a 2-minute lesson (action), streaks and surprises (reward), and your progress history (investment).
What the books say
Habit-forming products move users through four steps — trigger, action, variable reward and investment — until the behaviour becomes automatic.
Common mistakes
- Building habits that harm users.
- Making the action too hard.
- Relying only on notifications (external triggers).
Questions people ask
Is this only for apps?
No — it applies to any product used often, from coffee shops to newsletters.
References
- [1]
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