What is product-market fit
Also known as: PMF, product market fit
Product-market fit is the point when a product finds a market that truly wants it. In the definition Marc Andreessen popularized in 2007, it means being in a good market with a product that can satisfy that market. Before it, spending heavily on acquisition tends to burn money; after it, the challenge becomes meeting demand and growing efficiently.
A salon booking app had signups, but half its customers stopped using it within two months and almost nobody referred others. The team increased ad spend, and cost per customer only went up.
After interviewing the customers who stayed, it found the value was in the automatic message reminders, which reduced no shows. It rebuilt the product around that. Retention doubled, referrals appeared and, only then, investing in ads started to make sense.
Where it came from
Marc Andreessen wrote a post on June 25, 2007 called The only thing that matters, introducing Rachleff's Corollary of Startup Success: the only thing that matters is getting to product market fit. He credits the idea to Andy Rachleff, co founder of Benchmark Capital.
According to Wikipedia, Rachleff credits the underlying thinking to Don Valentine, founder of Sequoia Capital, and was the first to put a name to it, which Andreessen later popularized.
The signs, according to Andreessen
| What you see | |
|---|---|
| No product-market fit | Customers do not get value from the product, word of mouth is not spreading, usage grows slowly, the sales cycle drags and many deals never close |
| Product-market fit | Customers buy as fast as the company can deliver, usage grows and demand pulls the company along |
The 40% test
A popular way to measure it is asking customers how they would feel if they could no longer use the product. If at least 40% say they would be very disappointed, that is a sign of fit. The heuristic was popularized by Sean Ellis, who observed it across many startups.
It is not a scientific rule, and the number depends on who answers. But the question forces a look at what matters: is the product indispensable to someone, or merely interesting?
Other signs you can measure
- Retention that flattens: after a few months, a share of customers stops cancelling.
- Unprompted referrals growing.
- Sales cycles getting shorter without discounts.
- Customers complaining when the product goes down, not when they are billed.
Why it comes before scaling
Without fit, every extra dollar in marketing brings customers who leave, and cost per customer rises. That is why Sean Ellis, in the post where he coined growth hacker, placed that work after product market fit and an efficient conversion process had been proven.
Frequently asked questions
What is product-market fit?
Being in a good market with a product that can satisfy that market, in the definition Marc Andreessen popularized in 2007.
How do I know if I have product-market fit?
By the signs: retention that flattens, unprompted referrals, easier sales and customers who would badly miss the product. The 40% test helps measure the last one.
What is the 40% test?
Asking customers how they would feel without the product. If at least 40% say they would be very disappointed, there is a sign of fit. It was popularized by Sean Ellis.
Who coined the term product-market fit?
Andy Rachleff, co founder of Benchmark Capital, named the concept, which Marc Andreessen popularized in a 2007 post.
Can I invest in marketing before product-market fit?
You can invest to learn, with a small budget. Accelerating acquisition before fit usually raises cost per customer and churn.
Related terms
- Go-to-marketGo-to-market, or GTM, is the plan for how a product or service reaches customers: who to sell to, with what...
- Growth marketingGrowth marketing is the approach that treats growth as a process of continuous experiments across the whole...
- ChurnChurn is the rate of customers who stop buying or cancel during a period, relative to those the business had...
- Value propositionA value proposition is the clear promise of what customers gain by choosing an offer: which problem it...
- ICPAn ICP, short for ideal customer profile, is the kind of company, or customer, that gets the most out of what...
- LTVLTV (lifetime value, also called CLV) is the value a customer generates for a business over the entire time...
Rodrigo Fávaro
Founder of ROO3, a marketing and technology agency in São José do Rio Preto, Brazil. Builds AI products running in production (Tobia, gerar.app, Pense Mercado) and maintains the AI Benchmark, a public ranking of AI models.
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