Once triggered, the user must take an action. This is the simplest behavior performed in anticipation of a reward. According to Eyal, the likelihood of a user taking action depends on two key factors: their and their ability to do it.
The final phase of the Hook Model is where the user does a bit of work. Unlike the action phase, which offers immediate gratification, the investment phase focuses on .
You build something you wouldn't use, purely to exploit human vulnerabilities for profit. This leads to toxic user relationships and eventual backlash. Practical Takeaways for Product Teams
The Hook Model is a four-phase process that describes how products can be designed to create and maintain user habits. The four phases are: hooked how to build habit-forming products by nir eyal pdf
Word-of-mouth recommendations or a friend inviting you to an app.
The final phase of the Hook Model is the , which is the most counterintuitive but powerful step. Many product designers believe the relationship ends when the user receives the reward. However, Eyal argues that the moment the reward is delivered is the perfect time to ask the user to do a bit of work.
You use the product, but it doesn't add real value to the world (e.g., a highly addictive, superficial casual game). Once triggered, the user must take an action
The final phase is where the user puts something back into the product. This could be time, data, effort, social capital, or money. Unlike a typical transaction, investment implies that the user’s actions will make the product better for their next visit. Loading data, customizing settings, and building a follower base all create "stored value," making it incredibly difficult for the user to leave the ecosystem for a competitor. The Ethics of Habit-Forming Product Design
Before a product can form a habit, it must exist within what Eyal calls the . This is the sweet spot where a behavior occurs with both high frequency and high perceived utility .
The search for social connection, validation, and acceptance (e.g., likes, comments, retweets). The final phase of the Hook Model is
4️⃣ The user puts something in to increase the likelihood of returning.
Public relations, viral videos, and app store feature placements.
Nir Eyal’s Hooked is the blueprint for building products that stick. Here is the 4-step framework broken down in under a minute: 👇
💡 Ethics matter. This framework is powerful. Use it to improve users' lives, not just to steal their time.