I spent a long time trying to find similar things to what I was building, and of course now I'm finding out about PonyDebugger and this tool.

Different, though, because Kiln is meant to be more generic, and pluggable.

It's not totally clear from the project page, but I'm pretty sure this particular project is for RubyMotion, and you'll need to be writing your apps with that to benefit. You wouldn't be able to integrate Kiln straight into an existing Objective-C/XCode flow, unlike DCIntrospect. Someone do correct me if I'm wrong on this though.