The point where your product satisfies strong demand from a well-defined market — measured by 40%+ "very disappointed" Sean Ellis test, retention curves that flatten, and inbound > outbound acquisition.
Product-market fit (PMF) is the moment your product starts pulling customers instead of you pushing it on them. It is the most predictive predictor of startup success. Marc Andreessen called it "the only thing that matters." Pre-PMF, the priority is iteration speed and customer interviews. Post-PMF, the priority shifts to scalable distribution.
Used the Sean Ellis 40% benchmark to validate PMF before scaling
Achieved PMF by deeply listening to engineering manager pain
Without PMF, every dollar spent on marketing or ads is wasted because customers do not stick. With PMF, the same dollar compounds.
Sean Ellis test (40%+ very disappointed), retention curve flattening at >30% after 8 weeks, NRR >100%, and >30% organic acquisition.
Median 12–24 months from launch. Top quartile finds it in 6 months by starting from a validated problem.
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