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They mention that on the page, sounds like that was their inspiration:

"Reveal brings the power of tools like Firebug and Web Inspector to iOS developers."

Firefox's 3D View was definitely an inspiration. Note however that Reveal lets you focus in on a view within the view hierarchy, which is handy when you're only interested in one part of a large hierarchy.

Symbiote (https://github.com/TestingWithFrank/symbiote) and DCIntrospect (https://github.com/domesticcatsoftware/DCIntrospect) were also inspirations.

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