Campfire is a very popular web-based chat and team collaboration tool from 37Signals that has spawned a number of apps that ease use of the tool on both Mac and mobile devices. Now one of the more popular native clients for Campfire on OS X, Flint, has been released as an iOS app at an introductory price of US$4.99.
Giant Comet's Flint for iOS is a universal app that is at home on an iPhone or an iPad, and it was designed to work with iOS 7. Push notifications can be set up for specific keywords, so if you need to be alerted of team conversations regarding a certain project or person, you'll get pinged through Notification Center.