Product-market fit is not a binary milestone — it is a measurable state where your product solves a problem so well that users return organically and tell others. This guide presents a quantifiable framework for measuring PMF, including the Supergraphic metric, cohort retention analysis, the Sean Ellis test, and specific action plans for when you have not yet found fit. The techniques described here were used in the development of tanstackship.com . What Product-Market Fit Actually Means The mos