A North Star metric is the single number a company chooses to represent the core value it delivers to customers, used to align teams around one shared measure of progress instead of a scattered list of secondary metrics.
A good North Star metric captures actual customer value, not just business output. A messaging app's North Star might be messages sent between real, active users, rather than something easier to game but less meaningful, like total signups, which says nothing about whether people are actually getting value from the product.
The risk with any single chosen metric is optimizing it in ways that don't actually reflect the health of the business, which is why most companies pair a North Star metric with a small set of guardrail metrics (churn, gross margin) meant to catch exactly that kind of unintended tradeoff before it compounds.
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