Have you ever wasted an hour of your life trying to figure out the difference between one file and another file? You think they are identical but something isn’t working? If so, diffchecker.com is for you.
A lot of times I’ll try to follow along on a tech book I bought or an online tutorial. I was provided the final source code but the file I was following along with is somehow not working. There are lots of diff apps out there (my favorite is the one build into NetBeans) but if you need an answer quick, this is the best solution. It works on both PC and Mac.