Product Market Fit
Product market fit is the point where a product answers a real market need well enough that demand starts confirming itself, without disproportionate sales effort. Users come back, recommend the product, and growth becomes more organic.
This point shows up through concrete signals: retention stabilizes, users proactively request new features instead of churning, and a growing share of new customers arrive through referral rather than paid acquisition. Before this point, the product team needs to iterate fast, often starting from an MVP, to adjust the offer to the real need. After it, the priority shifts to scaling: infrastructure, sales process, hiring.
The costliest mistake is investing heavily in growth (sales hires, advertising) before confirming the product actually retains its users. That accelerates the acquisition of customers who, since the product doesn't truly meet their need, leave about as fast as they arrived. A good habit is tracking retention and spontaneous referrals before deciding to push on marketing.
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