How to know whether you have product–market fit, and what to do if you do not.

Product–market fit is the point where demand starts pulling the product forward: a specific group of customers uses it regularly, pays for it, recommends it and would be very disappointed to lose it. Before it, growth is a push. After it, the main job shifts to reaching more of the right customers.

Why it matters

Spending heavily on marketing and sales before product–market fit usually burns cash, because customers you acquire do not stay. Raising money on the promise of fit you do not yet have is risky for the same reason. Knowing where you stand tells you whether to keep iterating on the product or start scaling go-to-market.

Signals to look for

• Retention flattens. Cohort retention curves level off at a healthy share rather than falling towards zero.
• Customers would miss it. A meaningful share of active users say they would be very disappointed if they could no longer use the product.
• Referrals and inbound. New customers arrive from recommendations without you asking.
• Sales get easier. Shorter sales cycles, fewer objections, customers buying more seats or sites.
• Usage grows within accounts. More users, more activity or higher plans over time.

Step by step

1. Run the disappointment survey. Ask active users how they would feel if they could no longer use the product: very disappointed, somewhat disappointed or not disappointed. Also ask who they think benefits most, the main benefit, and how it could be improved. The product–market fit score tool helps you run and interpret this.
2. Segment the results. Find the group with the highest share of “very disappointed” answers. Describe them precisely: role, company type, use case.
3. Learn from your best fans. Interview several “very disappointed” users. What benefit do they value most? What do they use instead when the product is unavailable?
4. Focus on that segment. Narrow your messaging and roadmap to serve them better, and ask the “somewhat disappointed” users who resemble them what is holding them back.
5. Re-measure regularly. Repeat the survey every quarter, alongside retention cohorts, and track whether both improve.

Worked example

SiteSafe ran the disappointment survey with 64 active users. Overall, 29 per cent said very disappointed. But among site managers at contractors running more than five sites at once, it was 54 per cent, and their cohort retention had flattened after month two. Interviews showed they valued the client-facing inspection report above everything else. The team narrowed its target customer, rewrote its website around the report and prioritised the next three cycles on multi-site features. Two quarters later, the overall score had risen and the sales team, which had previously chased any contractor, was closing multi-site firms noticeably faster.

If you do not have fit yet

That is normal. Check whether the problem is the segment, the core job, activation, or the value delivered. Go back to discovery, consider a focused change of direction, and resist scaling sales and marketing until retention improves. The validation playbook covers deciding when a bigger pivot is needed.

Common mistakes

• Declaring fit on growth alone, when customers are not staying.
• Averaging across all users, which hides the segment that loves the product.
• Surveying inactive or brand-new users, who cannot judge the value yet.
• Scaling acquisition before fit, which mostly increases churn.
• Treating fit as permanent. Markets move; keep measuring.
• Relying on a single signal. Look for survey results, retention and sales behaviour pointing the same way.

What to measure

• Share of active users who would be very disappointed, overall and by segment.
• Cohort retention and where the curve flattens.
• Share of new customers from referrals and inbound.
• Net revenue retention once you have paying customers.
• Sales cycle length and win rate in your best segment.