Product-Market Fit
The degree to which a product satisfies strong demand in a good market.
Definition
Product-Market Fit (PMF) is the state in which a product satisfies strong demand in a good market — the point where a startup has built something a sizable group of customers genuinely want and will keep using and paying for. The term was popularized by Marc Andreessen, who defined it as 'being in a good market with a product that can satisfy that market.' It is widely treated as the most important early milestone for a startup, because growth efforts compound only after fit is found; before it, scaling typically amplifies churn rather than revenue.
Examples
Demand outpaces your ability to serve it: usage, sign-ups, and word-of-mouth grow faster than you push
Sean Ellis test: 40%+ of users say they would be 'very disappointed' if they could no longer use the product
Strong retention curves that flatten (a stable base of users keeps coming back) rather than decaying to zero
How AdSights helps you track Product-Market Fit
Before product-market fit, paid acquisition mostly reveals where fit is and isn't. AdSights helps teams read those signals faster by tying creative and audience performance to which segments actually engage and stick — so a flat retention curve in one audience and a strong one in another become visible in the funnel. After fit, AdSights helps scale the messaging and audiences that proved resonant, turning hard-won fit into repeatable, efficient acquisition.
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Common questions about Product-Market Fit, answered.
