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How we used the Sean Ellis test to find out our product-market fit

A short, honest look at how we ran the Sean Ellis test as we built Formixt, what the numbers can and cannot tell you, and how we used the answers.

MD. WalidMD. Walid · · 5 min read

The Sean Ellis test asks one question: "How would you feel if you could no longer use this product?" Responses are 'very disappointed', 'somewhat disappointed', or 'not disappointed'. The widely cited benchmark is that around 40% should say 'very disappointed' before you treat a product as having strong product-market fit.

What the test is good for

  • A quick gut-check on whether people would miss what you built.
  • A reason to talk to the people who said 'very disappointed'.
  • A trend you can track as the product changes.

What it cannot tell you

  • It is not a growth plan. A high score does not guarantee growth.
  • Small samples swing wildly; a handful of answers is a conversation, not a metric.
  • It says nothing about price, positioning or which channel works.

How we used it

We keep the question short, ask it inside onboarding, and follow up with anyone who says 'very disappointed' to learn why. Those conversations shaped the templates you can browse today.

This is a record of how we work, not a claim about how many people use the product.

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MD. Walid

MD. Walid

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