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TG3 SaaS/Glossary/Product market fit
SaaS metrics glossary

Product market fit (PMF).

The thing every founder claims and few can prove. Here is what product market fit really means and the signals that show you are there.

Definition
Product market fit (PMF) is the point where a product satisfies real market demand strongly enough that customers stay, refer others and would be genuinely upset to lose it.

PMF is a state you feel through metrics, not a box you tick. Before it, marketing spend scales pain, not growth, because you are pouring users into a product that does not hold them. After it, the same spend compounds.

How to know you have it

How to know you have product market fit.

Strong retention  +  organic pull  +  would-be-upset users  =  PMF
Retentioncohorts flatten instead of decaying to zero
Organic pullgrowth that arrives without you buying it
Would-be-upseta large share of users say they would be very disappointed to lose the product

The classic test is the share of users who would be very disappointed to lose you, see activation rate for the leading signal.

Benchmarks

Why product market fit changes everything.

Before product market fit, more marketing just fills a leaking bucket faster. Retention is the tell. If cohorts decay to near zero, you do not have it yet, no matter what the top-line says.

After product market fit, retention flattens, word of mouth kicks in and paid acquisition finally pays back. The job of marketing flips from finding the fit to scaling it.

How to improve it

What to do before product market fit.

01

Do not scale spend yet

Pouring budget into a product that does not retain just burns money faster.

02

Watch retention curves

Flattening cohort retention is the clearest signal you are getting close.

03

Talk to churned users

The people who left tell you what is missing far better than the ones who stayed.

04

Nail one segment

PMF is usually found in a narrow segment first. Win it before you widen.

Common questions

Questions about product market fit.

What is product market fit?+

The point where your product satisfies strong market demand, shown by retention, organic growth and customers who would be upset to lose it.

How do you measure product market fit?+

Retention curves that flatten, organic pull and the share of users who would be very disappointed to lose the product are the main signals.

Why does marketing fail before product market fit?+

Because spend scales a leaking bucket. Users arrive and leave, so acquisition never pays back until retention holds.

Can you lose product market fit?+

Yes. Markets and competitors move. PMF is a state to maintain, not a milestone you bank forever.

Activation rateNet revenue retentionNorth star metricGo-to-market strategy

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