Definition · also called PMF, product/market fit
Product-market fit (PMF) means being in a good market with a product that satisfies it. Marc Andreessen popularized the term in a June 2007 essay, arguing it is the only thing that matters for a startup's early survival. (source)
In practice you feel it as pull: customers find you, use the product repeatedly, pay without heavy persuasion, stay, and refer others. Before PMF, everything takes pushing.
How to measure product-market fit
- The Sean Ellis test. Ask active users how they would feel if they could no longer use the product. Growth marketer Sean Ellis suggested that when about 40% or more answer “very disappointed”, you likely have PMF. It is a leading indicator, not proof.
- Retention curves flatten. Plot what share of each signup cohort is still active (or paying) month by month. If the curve levels off instead of falling to zero, a core group finds lasting value.
- Organic growth. A rising share of new customers come from word of mouth, search for your brand or referrals.
- Low churn at your price point (see churn benchmarks).
- Customers complain when it breaks. Silence during an outage is a bad sign.
PMF for a small indie product
Indie makers don't need venture-scale fit. A niche of a few thousand customers who love the product is enough for a micro SaaS. What matters is that retention and word of mouth are strong within the niche you chose.
Product-market fit in practice: how indie makers use it
Stories from the directory where fit arrived, often after a pivot:
PricingBot, a price-monitoring service, struggled for traction. In 2019 the founders noticed the scraping infrastructure behind it was the real product, pivoted to ScrapingBee, got a paying customer within an hour of emailing prospects, and passed $1M ARR in 2021. (source: scrapingbee.com)
Built SavvyCal in a crowded scheduling market, reached #2 Product of the Month in January 2021, $10K MRR that April and $20K by October, and has talked about finding fit in a competitive market at MicroConf. (source: producthunt.com)
MentorCruise grew slowly for two years until a pricing change in 2020 lifted MRR from about $600 to $4,200. Sometimes fit is a pricing problem, not a product problem. (source: starterstory.com)
Bannerbear was the seventh idea in his 12-startups-in-12-months challenge; the earlier ones either sold small or were dropped. (source: bannerbear.com)
Frequently asked questions
What is product-market fit?
Being in a good market with a product that satisfies it, so customers keep using and paying for it and recommend it without heavy selling. Marc Andreessen popularized the term in 2007.
What is the Sean Ellis 40% test?
A survey asking active users how they'd feel if they could no longer use the product. If about 40% or more say “very disappointed”, Sean Ellis suggests you likely have product-market fit.
How do you know you don't have product-market fit?
Signups don't stick, retention cohorts keep falling toward zero, growth only comes from your own pushing, and customers don't notice when the product is down.
Can a niche product have product-market fit?
Yes. Fit is about how well the product serves its market, not the market's size. A micro SaaS with a small, loyal niche can have strong fit.
Related terms
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Maker examples are paraphrased from the cited sources and from each maker's IndieMakerList profile; revenue is self-reported unless marked verified. Spotted an error? Tell us.