Prefs Editor is an editor that works like the plist editor in Xcode, but affects the current preferences of any chosen application. It is effectively a GUI replacement for the "defaults" command.
What’s new in version 1.4.1
Updated on Oct 24 2022
New: Shows YES or NO after the checkbox with Boolean entries.
Excellent app from the creator of Find Any File (my favourite file search app for Mac).
I really miss Apple's standalone Property List Editor, and resent launching the whole clunky Xcode suite just to edit one little plist file. This brilliant app fills the gap beautifully and has a few extra tricks.
NB I have no connection to the developer, apart from the fact that I happily donated for FAF in the spirit of supporting the shareware I value.
Prefs Editor makes it easy to test out UserDefaults for apps as I'm developing them. There's no bells and whistles, and nor should there be. It's simple and straightforward.