Cuil (pronounced [ku?l], "cool", according to the creators) is a search engine that organizes web pages by content and displays relatively long entries along with thumbnail pictures for many results. According to CNET, Cuil is a startup founded by the husband-and-wife team of Stanford professor Tom Costello and former Google search architect Anna Patterson. Launched Monday, July 28, 2008, it is a new search engine that claims to index three times as many Web pages as Google. It claims to have a larger index than any other search engine, with about 120 billion web pages.

Cuil's privacy policy, unlike that of other search engines, says it does not store users