Product-Market Fit
PMF is not a milestone. It’s a signal — one that arrives before you name it.
You know you have it when:
- Retention curves flatten instead of falling to zero
- Users are disappointed when the product goes down, not just annoyed
- Word of mouth happens without you engineering it
- The sales cycle shortens without you changing the pitch
The Trap
Most founders chase PMF as a binary state — “we either have it or we don’t.” The more useful frame is fit as a spectrum. You can have strong fit in a tiny segment and no fit in the larger market you actually want.
Segment clarity is more actionable than aggregate retention.
How You Find It
You don’t find PMF. You earn it through repeated conversations with people who have the problem badly enough to pay for relief.
The earliest signal: someone changes their behavior because of your product. Not because they’re being polite. Not because they got a free trial. But because it removes a friction they’d been silently tolerating.
What Breaks After You Have It
Finding PMF in a small segment creates a new problem — can you expand fit without destroying what worked?
The graveyard is full of products that nailed fit for 1,000 users and then rebuilt for 100,000 and lost everything that made the first group love them.
See: [[distribution-moat]] for what to build after fit is proven.