AppKiDo is an API documentation browser for Cocoa and iPhone programmers. It helps you quickly find the doc you want, whether it's for a class, protocol, function, type, or constant. AppKiDo parses the headers and HTML doc files that were installed with your Developer Tools. It presents the results in a form that is easy to navigate. AppKiDo presents the class hierarchy in a browser view. You can see sibling classes at a glance and go up and down the hierarchy with a single click. This is convenient because the method you're looking for is often in a superclass. If you are new to Cocoa, browse the class hierarchy to get acquainted with what's there and how it's organized. If you are more experienced, you can explore branches of the hierarchy you never paid attention to before.