What a North Star metric is
A North Star metric is the single measure that best captures the core value your product delivers to its customers. Amplitude, which developed the North Star Framework, frames it as one output metric paired with a small set of input metrics — the levers a team can directly influence to move it. The term was popularized by growth practitioner Sean Ellis. It is the metric a growth lead steers the whole team toward.
Examples (commonly cited)
The textbook examples are widely repeated even if rarely confirmed in official company statements: Airbnb is associated with nights booked — value to both guests and hosts — and Spotify with time spent listening, an engagement measure rather than raw revenue. Treat these as illustrations of the shape of a good North Star, not as audited facts. What they share is that the number rises only when customers genuinely get more value.
How to pick yours
Why a small team needs one
A North Star is a focusing device, and focus is a small team's main advantage. With one metric, every experiment has a clear question — does this move it? — and the lifecycle work downstream has a target to serve. Without one, a small team scatters across whatever feels urgent that week.