A north star metric is the primary measure that reflects the recurring value a product creates for users and the business.
It keeps product teams from optimizing vanity metrics that do not represent durable value.
A music product might care more about weekly listening hours than signups because listening is the value users came for.
Public previews show the map. The app gives you reps, Hatch follow-ups, FLOW feedback, weak-move drills, and saved proof of progress.