Superhuman's PMF engine (annotated case study)
In 2018, Rahul Vohra published a detailed account of how Superhuman used a single survey question — 'How would you feel if you could no longer use Superhuman?' — to quantify and then engineer product-market fit. The framework is a canonical example of turning an intuition ('users seem to love this') into a falsifiable, repeatable measurement. Source: First Round Review, 'How Superhuman Built an Engine to Find Product/Market Fit.'
2026-07-05