Tinder is an API for interfacing with Campfire, the 37Signals chat application. It is a Java based XMPP library, providing an implementation for XMPP stanzas and components. Tinder's origins lie in code that's shared between Jive Software's Openfire and Whack implementations. The implementation that's provided in Tinder hasn't been written again "from scratch". Instead, code has moved from the Openfire and Whack projects into Tinder, preserving all of the existing features and functionality.