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The fourth and final phase of the Hook Model is the Investment. The investment phase is where users put something of value into the product, such as time, money, or effort. This investment creates a sense of ownership and increases the likelihood of users returning to the product.
: This is what creates a craving. Unpredictable rewards—like the "slot machine" feel of scrolling through TikTok or Instagram—activate the brain's desire regions more than predictable ones. Investment
"I call it the 'Panic Button,'" Leo said. "We’ve redesigned the Hook." hooked how to build habitforming products free pdf fix
Builds a product they do not use, and it does not improve lives. This is exploitation.
By following the Hook Model and leveraging the free PDF guide, you'll be well on your way to building habit-forming products that drive long-term engagement and growth.
Nir Eyal’s book introduces the , a four-step framework designed to guide user behavior and create unprompted user engagement. The ultimate goal of a habit-forming product is to connect a user’s problem (an internal trigger) to your solution (the product) frequently enough to form a subconscious routine. This public link is valid for 7 days
are cues embedded in the environment that tell users what to do next. Notifications, emails, website links, and app icons are all external triggers. They're the visible, tangible prompts that pull users toward a product.
Products with high frequency of use (like Google search or social media feeds) naturally fall into the habit zone even with relatively low perceived utility per session. Products with low frequency (like booking travel or shopping for a house) need exceptionally high perceived utility to become habitual.
What exact negative emotion does your user feel right before they should use your app? If you cannot name it, your positioning is wrong. Can’t copy the link right now
Users are overwhelmed by spammy notifications, or the external triggers don't align with internal user emotions.
Audit your notification timing. Ensure notifications offer clear utility, not spam. High drop-off rates during onboarding or sign-up.
Add dynamic content. If you run an e-commerce or educational app, change the feed layout, introduce daily challenges, or personalize recommendations using machine learning so the user never encounters the exact same page twice. Encourage Meaningful Investment
You use the product, but it doesn't objectively improve anyone's life (e.g., casual gaming).
: After purchasing the book, you can claim bonuses and case studies directly from Nir Eyal's website.