Hook Model
The Hook Model, from Nir Eyal's book 'Hooked,' describes how products create habitual usage through a four-phase cycle: Trigger (what prompts the user), Action (the simplest behaviour in anticipation of reward), Variable Reward (the unpredictable payoff that creates craving), and Investment (what the user puts in that makes the product better with use). Products that master the Hook cycle don't need expensive advertising — they become part of users' routines.
When to use this framework
- →You want to increase user engagement and daily active usage
- →Your product is useful but people forget to use it
- →You need to reduce dependence on paid acquisition by building organic habits
- →You're designing onboarding flows and retention loops
- →You want to understand why competitors' products are 'sticky' and yours isn't
Before you start
Have a clear understanding of your core user and their daily routines. The Hook Model works best for products that could be used frequently (daily or near-daily).
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Instagram (2012-2014)
1. Trigger — What brings the user back?
Triggers can be external (notifications, emails, ads) or internal (emotions, routines, situations). The goal is to move from external to internal triggers over time.
What external prompts drive users to open your product? Push notifications, emails, social media mentions, word of mouth, ads, or environmental cues.
What emotion or internal state drives users to your product without external prompting? Boredom, loneliness, uncertainty, FOMO, anxiety, curiosity? The strongest products attach to negative emotions that users want to resolve.
How strongly associated is your product with the internal trigger? 1 = users never think of you, 10 = you're the automatic response to that emotion.
2. Action — The simplest behaviour
The action is the simplest thing the user does in anticipation of a reward. It must be easier than thinking. Fogg's model: Behaviour = Motivation + Ability + Trigger.
What is the simplest action the user takes? Scrolling a feed, typing a search, opening the app, pressing a button. The lower the friction, the higher the habit potential.
What motivates the user to take the action? Pleasure/pain, hope/fear, social acceptance/rejection. The action should require minimal motivation because the trigger is strong.
How easy is the action to perform? Rate: 10 = zero effort (swipe, tap), 1 = requires significant time, money, thought, or physical effort.
3. Variable Reward — The unpredictable payoff
Variability is what creates craving. Predictable rewards satisfy; unpredictable rewards create desire. Three types: tribe (social), hunt (resources/information), and self (mastery/completion).
Social rewards: likes, comments, follows, recognition, acceptance. Do users get social validation from using your product?
The reward of finding something valuable: news, deals, information, content. The variability of a feed — you never know what you'll find.
Personal satisfaction: completing a task, levelling up, inbox zero, streaks, achievement. The reward of competence and consistency.
How variable (unpredictable) is the reward? 10 = every session is different and surprising, 1 = completely predictable outcome every time.
4. Investment — Loading the next trigger
Investment is what the user puts into the product that makes it better with use and increases the likelihood of returning. Data, content, followers, reputation, or skill. Investment loads the next trigger.
What do users put into your product that makes it more valuable to them? Data, preferences, content, social connections, reputation, time spent learning. The more invested, the harder to leave.
How does the investment create the next trigger? E.g., adding friends → they post content → you get a notification → you open the app. The investment should naturally create the next external trigger.
How hard is it to leave once invested? 10 = years of irreplaceable data/connections, 1 = no cost to switch.
5. Hook Assessment
Average of trigger strength, action ease, reward variability, and switching cost. Higher = stronger habit loop.
Which phase is weakest? That's where your habit loop breaks. Focus your next effort there.
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