NPS Doesn't Measure PMF: Here's What Does

NPS tells you how customers feel about working with you at the moment you asked. PMF is about whether customers would change their behaviour to keep working with you — under conditions you haven't introduced yet. Those are different measurements, and treating them as interchangeable has derailed more seed-stage roadmaps than almost any other metric error I've seen. A 72 NPS tells you customers like you. It doesn't tell you whether they'd fight procurement to renew, survive a competitor offering 20% less, or stay loyal through a product quality dip. The metrics that actually predict PMF are behavioural. What do users do when you raise the price? When you introduce friction? When a credible free alternative appears? Surveys don't answer those questions.