Foundertrace – chain of YC startups founded by its employees
Inspired by PG’s tweet about a chain of 4 YC startups where the founder worked at a YC startup, I vibe coded and generated these genealogy chains for all ~6k YC startups. And to make these trees easily accessible I packaged them into a hosted webapp. Few noteworthy YC startups which have had huge impact in YC ecosystem Airbnb - 83 YC startups spawned Stripe - 67 YC startups spawned Dropbox - 50 YC startups spawned Justin.tv/Twitch - 47 YC startups spawned More recently founded YC startups which have spawned a lot more YC startups Rappi - 21 YC startups spawned Brex - 20 YC startups…
In plain words
Foundertrace is a web application that maps the genealogy of Y Combinator startups, showing chains where founders worked at other YC companies before starting their own. It tracks all approximately 6,000 YC startups and visualizes which ones spawned the most new ventures, with Airbnb leading at 83 descendants, followed by Stripe at 67 and Dropbox at 50. The tool helps users explore the interconnected network of YC-backed entrepreneurs and their career trajectories.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
Inspired by PG’s tweet about a chain of 4 YC startups where the founder worked at a YC startup, I vibe coded and generated these genealogy chains for all ~6k YC startups. And to make these trees easily accessible I packaged them into a hosted webapp. Few noteworthy YC startups which have had huge impact in YC ecosystem Airbnb - 83 YC startups spawned Stripe - 67 YC startups spawned Dropbox - 50 YC startups spawned Justin.tv/Twitch - 47 YC startups spawned More recently founded YC startups which have spawned a lot more YC startups Rappi - 21 YC startups spawned Brex - 20 YC startups spawned Scale AI - 19 YC startups spawned
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