Product-market fit is the degree to which a product satisfies strong market demand. The most widely used PMF test is the Sean Ellis 40% rule: if at least 40% of surveyed users say they would be 'very disappointed' if the product went away, you have achieved product-market fit.
Product-market fit (PMF) is the point at which a product meets the needs of a specific market so well that customers use it, pay for it, and tell others about it. Marc Andreessen, who coined the term, described it as 'being in a good market with a product that can satisfy that market.' Pre-PMF, nothing else matters as much as finding it. Post-PMF, scaling becomes the primary challenge.
The most practical PMF measurement is the survey question from Sean Ellis (founder of GrowthHackers): "How would you feel if you could no longer use this product?" If 40% or more of respondents answer "Very Disappointed," you have achieved PMF. Below 40% means you haven't yet. This benchmark was derived from analyzing dozens of early-stage startups.
Signs of PMF: organic word-of-mouth growth, sales closing easily, users defending the product to others, usage increasing without heavy marketing. Signs you lack PMF: high churn, feature requests that contradict each other, users not coming back after signing up, sales requiring heavy convincing. Paul Graham's test: are users spontaneously telling friends about your product?
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