The One Metric That Matters
A North Star Metric is the single number that best captures the core value a product delivers to customers. It aligns teams around growth and guides product decisions.
Examples by Company
- Facebook: Daily Active Users (DAU) — more users = more network value
- Airbnb: Nights Booked — core transaction that drives revenue
- WhatsApp: Messages Sent — engagement = stickiness
- Spotify: Time Spent Listening — retention signal
- Uber: Rides Completed — marketplace health
- Amplitude (analytics): Weekly Learning Users (users who derive insights)
- Medium: Total Time Reading — content quality + engagement
What Makes a Good NSM?
- Measures core value: Reflects why customers use product
- Leads to revenue: Grows naturally with business success
- Actionable: Teams can move the number
- Easy to understand: Everyone knows what it means
- Leading indicator: Predicts long-term success
Bad North Star Metrics
- Signups: Vanity metric if users don’t activate
- Revenue: Lags actual product value, can be gamed with discounts
- Page views: Doesn’t mean engagement or retention
- Downloads: App stores full of downloaded-but-never-opened apps
The Framework
Sean Ellis (growth hacker who coined “growth hacking”) popularized the concept around 2015. Amplitude (analytics company) evangelized it heavily via blog posts and playbooks.
Supporting Metrics
NSM sits atop a pyramid:
- North Star: One metric (e.g., Nights Booked)
- Input metrics: Factors that drive NSM (listings, search quality, pricing)
- Health metrics: Ensure sustainable growth (retention, NPS, unit economics)
Cultural Impact
Product teams obsess over NSM. Weekly reviews, dashboards, OKRs all oriented around moving the North Star. Critiqued as reductionist — “not everything that matters can be measured.”
Sources: Amplitude North Star Guide, Sean Ellis Blog