What is a north star metric?
A north star metric is the 1 number your team agrees best represents the value customers get from the product.
Useful north stars measure customer value, not just company revenue: nights booked instead of booking revenue, or messages sent instead of sign-ups.
It isn't a target or a full set of KPIs. It is 1 shared measure chosen to align decisions.
Why it matters for product builders
It turns “which idea do we prefer?” into “which idea is most likely to move the value customers receive?”
What changes in AI-first products
When almost anything can be built quickly, a shared measure helps decide what is worth doing. It can also be gamed faster, so watch for the system reaching the number in ways you didn't intend.