What PMF actually is
Marc Andreessen's original framing — "you can feel it when you have it" — is annoyingly vague and unfortunately correct. PMF is when you can stop pushing the product on people and they start pulling.
Concrete signals:
- Organic growth from word-of-mouth without paid acquisition lifting it
- Users come back unprompted (DAU / WAU stays high without push campaigns)
- Churn rate stops looking scary (under 5%/month for B2C, under 2%/month for B2B SaaS)
- Sales cycle compresses without you doing anything different
- Customers tell their friends — you see referral signups you didn't ask for
What founders confuse for PMF
- A flat sign-up curve that "trends up" if you squint
- Three big customers who all came from the founder's network
- Press coverage and demo-day attention
- Investor enthusiasm
- A waitlist (waitlists measure curiosity, not fit)
How long it actually takes
Median time to PMF for venture-backed B2B SaaS: 3–5 years. Faster outliers exist; they're outliers. Founders who tell you they hit PMF in 6 months either had a pre-existing audience (warm starts) or are calling early traction "fit."
When MVP work matters
A working MVP doesn't create PMF. It creates the surface where PMF is testable. Without one you're guessing.
