This is a class browser for the Objective-C runtime on Mac OS X. It gives you full access to all classes loaded in the runtime; allows you to dynamically load new modules and their classes; shows every method implemented on each class; and displays information in a header (.h) file format.

We have found this to be a useful development tool. Please note, however, that each user is responsible for their own usage.

The original version was released in April 2002 by Ezra Epstein. The project is maintained by Nicolas Seriot since August, 2008.

The OS X version features:

• browse by class tree, image or indexed list
• search in classes contents
• syntax colorization
• drag and drop frameworks and headers

Latest build: http://seriot.ch/temp/runtimebrowser.zip

The iOS version features:

• browse by class tree, image or indexed list
• search in classes names
• headers retrieval through HTTP
• instantiations and basic methods invocations at runtime

You can browse the iOS headers as seen by RuntimeBrowser.