A busy launch can make a product feel inevitable. Sign-ups arrive, the team shares screenshots of the growth chart, and enthusiastic customers offer to introduce their friends. A few months later, the harder question emerges: how many people still need it when the novelty and promotional effort have passed?
Product-market fit concerns that enduring relationship between a product and a market. The formulation associated with Marc Andreessen centres on a good market and a product that satisfies it, as discussed in Andreessen Horowitz’s account of product-market fit. In practice, establishing whether the relationship exists requires a more detailed account of who benefits, what they use the product for, and what keeps them coming back.
Look for a pattern of value
There is no single measurement that settles the question for every business. A subscription service might examine renewal and expansion alongside the reasons customers stay. A product used for an annual task needs a different observation window from a daily collaboration tool. Repeated use matters only where repetition makes sense; someone who successfully completes a one-off application should not have to return to count as a success.
Retention by cohort can reveal whether successive groups are finding lasting value. Revenue adds another perspective, although discounts, long contracts and expensive personal support can conceal a weak underlying proposition. Interviews with continuing and departing customers help explain the pattern, particularly when they explore real decisions rather than invite praise.
A narrow fit can be worth building on
Imagine a scheduling product attracting freelancers, agencies and large employers. Overall retention looks unremarkable, but small agencies keep using it to coordinate work across clients. That illustrative pattern suggests a promising market to investigate, rather than a reason to average all three groups together or declare universal success.
The team would need to understand the agencies’ alternatives, the consequences of the scheduling problem and who controls the purchase. Customer discovery helps expose those details. It may also reveal that the apparent fit depends on one unusually attentive account manager, making it difficult to reproduce for the next customer.
Treat the conclusion as something that can change
A survey asking how disappointed customers would be to lose a product can contribute evidence of attachment. It cannot, by itself, establish a viable market, sustainable acquisition or continued demand. The people invited, their experience with the product and who chooses to reply all influence the result.
A useful product-market fit assessment therefore states its boundaries: which customers, which need, what evidence and over what period. Competition, budgets and working habits can alter the relationship. Keeping that assessment current gives the team a clearer basis for investment than treating product-market fit as a badge earned permanently at launch.