• CoFounders Lab Claims to be the largest startup community on the Internet. Limited (5 co-founders/month) free cofounder search, $29USD/m to get unlimited search, industry leader advice, and prepare your pitch. Claims over 40,000 entrepreneurs, advisors, and interns.
  • Y Combinator Co‑Founder Matching Free, claims over 100k matches made. Prioritizes on matching, with the intent of signing up to YCombinator.
  • founderio.com They help if you’re looking for cofounders, investors, startup employees or business supporters.
  • STARTHAWK Free. Their goal is to make your co-founder search as easy and effective as possible.

I also recommend in person local events, especially if you’re in an urban area.

Finally, if you’re on reddit, I’ve run r/cofounderhunt for those hunting for their perfect co-founder.

Hi, I’m Kris with a K, and co-founder of Kofinders.com with a K which was created to solve the issues I’ve found and observed with the above platforms, and which also helps cofounders with our novel dynamic contract system, and hopefully the most useful cap(italization) table builder for co-founders. I’ll write more on cap tables in another post, but note that most first time co-founders get cap tables wrong, and every startup you’ve run or advised, you learn more in the process, so this modern cap table builder is written with my years of experience, and active role in the startup community.