Dear SaaStr: How Do I Know If I Have Product-Market Fit for Real in the Early Days? We Sell to SMBs.
You’ll know you’ve hit product-market fit (PMF) in B2B SaaS when a few key things start happening consistently:
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Your Customer Count is Growing Rapidly: For early-stage SaaS, doubling your customer base monthly—even from a small base—is a strong signal. If you’re not growing at least 10% month-over-month after hitting $10K MRR, you’re likely not there yet. PMF means customers are pulling your product out of your hands, not the other way around.
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Word-of-Mouth Referrals are Kicking In: When existing customers start bringing in new ones without you asking, that’s a huge indicator. It shows your product is delivering enough value that people are talking about it. If you’re not seeing this yet, your product might not be solving a big enough pain point.
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You Have More Leads Than You Can Handle: PMF often means you’re overwhelmed with inbound interest. If you’re struggling to keep up with demo requests or sign-ups, that’s a great sign. If you’re still relying heavily on outbound efforts to generate leads, you might be close but not quite there.
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Retention is Strong: For B2B SaaS, retention is everything. If your churn is high—like the 40% first-month churn you mentioned earlier—you’re not at PMF yet. PMF means customers stick around because they can’t live without your product. Look for net revenue retention (NRR) above 100% as a key metric.
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You’re Growing >100% YoY at $500K+ ARR: Once you hit $500K ARR, you should be growing at least 100% year-over-year if you’ve truly nailed PMF. Anything less suggests you’re solving a problem, but maybe not a big enough one.
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