I use Mac OS's File Merge utility to diff files whenever I need it. Gets the job done and has a clean UI. This tool is good in that it is platform agnostic but I'd be hesitant in pasting anything personal or confidential with a 3rd party online.
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@sarthakgrover TIL OS X (well, XCode actually) has a FileMerge utility
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@brandonb927@john_tans It's one of those hidden gems you never find out about till you actually need it and start digging around =)
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