So far, the site has attracted thousands of prospective parents, says Mr. Spedale, though he isn't yet aware of any matches among people agreeing to co-parent.

WSJ: Tech's Over-Sharing Economy

Darren Spedale, 38, the website's founder, says he started the company in 2012 after realizing his own biological clock was ticking but he didn't have someone with whom to raise a child.

WSJ: Tech's Over-Sharing Economy

Darren Spedale, 38, the website's founder, says he started the company this year after realizing his own biological clock was ticking but he didn't have someone with whom to raise a child.

WSJ: Tech's Over-Sharing Economy