Obtain App Name/Environment Metadata or URL?

Certified Associate Developer

My project exists as three environments hosted on three separate URLs with three separate app names (dev, test and production respectively).  I want to make changes to my interfaces that only render in certain environments (mainly dev) so that they don't interfere with the client's UI experience.  I was wondering if there was some sort of metadata or variable that I could use to identify them for conditional logic.  I know pp! variables do something similar for processes.  Also, using string fragments from the unique parts of the URLs might work too, but I wasn't sure what methods are the current gold standard.

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