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Product-market fit, studied

How startups found
product-market fit.

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Featured story
superhuman.com · Series B · ~$825M

How Superhuman engineered its way toward product-market fit

The key move: measuring how disappointed users would be if the product disappeared — then rebuilding the whole experience around the ones who cared most.

Early wedge · Inbox power users
Key signal · “Very disappointed” score
Acquisition · Hand-picked waitlist
Model · $30/mo premium
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7 min read · 6 sources · Updated Jul 2026
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