hooked-model

name	hooked-model
description	Use when asked to "build habit-forming products", "Hooked model", "trigger action reward investment", "create sticky behavior loops", or "design habit loops". Helps design products that form unprompted user habits. The Hooked Model (created by Nir Eyal) explains how products create habits through Trigger, Action, Variable Reward, and Investment.

The Hooked Model

What It Is

The Hooked Model is a framework for building products that create unprompted user engagement. The core insight: habit-forming products connect to internal triggers through a repeating cycle of trigger, action, reward, and investment.

When a product becomes a habit, users engage without external prompts. They don't need ads, emails, or notifications to come back. They return because the product has become their automatic response to an internal trigger like boredom, loneliness, uncertainty, or FOMO.

The key shift: Move from asking "How do we get users to open the app?" to asking "What internal trigger do we want to own, and how do we become the automatic response to it?"

When to Use It

Use the Hooked Model when you need to:

• Design features that drive repeat engagement (not just one-time use)
• Reduce dependency on external marketing to bring users back
• Improve retention and decrease churn through habit formation
• Understand why competitor products are so sticky (reverse-engineer their hooks)
• Create ethical engagement that genuinely improves users' lives
• Prioritize which features to build based on habit potential
• Increase customer lifetime value through deeper product integration

When Not to Use It

• The product is inherently infrequent (e.g., buying a house, annual insurance)
• Users should consciously evaluate each decision (e.g., financial trading, medical diagnosis)
• Habit formation would harm users rather than help them
• You want to manipulate users into behaviors against their interests

Patterns

Detailed examples showing how to apply the Hooked Model correctly. Each pattern shows a common mistake and the correct approach.

Critical (get these wrong and you've wasted your time)

Pattern	What It Teaches
external-triggers-only	Products that rely only on notifications never form habits
action-too-hard	If the action requires effort, the habit loop breaks
predictable-rewards	Predictable rewards don't create craving; variable rewards do
no-investment	Without investment, users have no stake in returning
wrong-internal-trigger	Targeting the wrong emotion means the habit never sticks

High Impact

Pattern	What It Teaches
dark-patterns-vs-ethical	Hooks should improve users' lives, not exploit them
rewards-of-the-tribe	Social validation is one of the most powerful variable rewards
rewards-of-the-hunt	The search for resources and information drives engagement
rewards-of-the-self	Personal mastery and completion drive intrinsic motivation
investment-loads-next-trigger	The best investments create reasons to come back
ability-before-motivation	Make the action easier before amplifying motivation

Medium Impact

Pattern	What It Teaches
frequency-matters	Habits form faster with more frequent behaviors
vitamin-vs-painkiller	The best habit-forming products start as vitamins and become painkillers
manipulation-matrix	Use the matrix to evaluate whether your hook is ethical

Deep Dives

Read only when you need extra detail.

• references/hooked-model-playbook.md: Expanded framework detail, checklists, and examples.

Resources

Books:

• Hooked: How to Build Habit-Forming Products by Nir Eyal — the complete framework
• Indistractable: How to Control Your Attention and Choose Your Life by Nir Eyal — the flip side: helping users control habits

Concepts Referenced:

• B.J. Fogg's Behavior Model (B = MAT)
• Variable reinforcement from behavioral psychology
• Carol Dweck's research on mindset and willpower

Related Frameworks:

• Jobs-to-be-Done — Understanding why users "hire" products (complements the internal trigger analysis)
• Fogg Behavior Model — The underlying model for the Action phase

From the Source: Nir Eyal on building ethical habit-forming products: "If it helps you become more productive, helps you live a happier, healthier life, that's wonderful... It's really about how do you get people to keep coming back to your product or service, not because they have to, but because they want to."