YC has a known bias towards multiple founders. They accept solo founders, but solos have to stand out more or maybe already started their business. YC even provides a co-founder matching system (of unknown efficacy).
PG said "Empirically it seems to be hard to start a startup with just one founder. Most of the big successes have two or three. And the relationship between the founders has to be strong. They must genuinely like one another, and work well together. Startups do to the relationship between the founders what a dog does to a sock: if it can be pulled apart, it will be."
PG said "Empirically it seems to be hard to start a startup with just one founder. Most of the big successes have two or three. And the relationship between the founders has to be strong. They must genuinely like one another, and work well together. Startups do to the relationship between the founders what a dog does to a sock: if it can be pulled apart, it will be."
Also see: Does YC fund solo founders: https://www.ycombinator.com/library/7P-does-yc-fund-solo-fou...