Product-Market Fit

Most founders mistake early traction for fit.

A handful of sales, a few retained users, an investor who nods along. That is not product-market fit. That is momentum masquerading as gravity.

Look at the latest round of layoffs in SaaS... companies scaling headcount on usage growth that never converted to retention. That is the gap this tool measures.

Sean Ellis drew the line at 40%. If fewer than 40% of your users would be "very disappointed" without your product, the market would recover from your absence. You have usage. Not fit. The gap between those two things is where most products quietly die.

16 questions across four dimensions. Weighted by Ellis, Vohra, Chen, Balfour, Andreessen, and Rachitsky. Three fatal flaw detectors that collapse otherwise decent scores. The maths is not generous.

No AI. No cost. Your answers. Your verdict.

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