Product-Market Fit
Product-market fit is the point where a product satisfies a strong market demand, when enough customers genuinely need your product and are willing to pay for it.
Product-market fit (PMF) is the most important milestone for any new product or startup. It means you've built something that a specific group of people genuinely wants, not just tolerates.
Pre-PMF, the priority is learning and iterating. Build the minimum product needed to test your hypothesis, get it into users' hands as quickly as possible, measure engagement and retention (not just signups), talk to users constantly, and iterate rapidly. Most products need significant pivots before finding PMF.
In practice
- Slack's usage metrics told the PMF story: 2,000 customers in the first week of launch, 8,000 within 2 weeks, with daily active usage rates above 80%, clear pull from the market
- A startup spent $500K on marketing before achieving PMF, 90% of signups churned within 30 days. They paused marketing, talked to remaining users, rebuilt the product, and found PMF 6 months later
- Superhuman uses the Sean Ellis survey: if less than 40% of users say they'd be 'very disappointed' without the product, they iterate. They crossed the 40% threshold after 3 major pivots
- An e-commerce platform knew they had PMF when sellers started recommending the platform to other sellers without any referral incentives, organic growth exceeded paid growth
Not sure how this applies to you?
A senior engineer walks your site, your search presence and the way enquiries reach you, then writes down the three things worth fixing first. You keep the document either way.