Habit-forming products often start as nice-to-haves, but once the habit is formed, they become must-haves.

If users are not doing what the designer intended (when users are investing time, effort, etc in your product), the designer may be asking them to do too much.

Why not live now instead of someday?

Users who continually find value in a product are more likely to tell their friends about it.

Instead of relying on expensive marketing, habit-forming companies link their services to the users' daily routines and emotions.

To initiate (user) action, doing must be easier than thinking.

The aim is to influence customers to use your product on their own, again and again without relying on overt calls to action such as ads or promotions.