Melodyne is way more advanced : you can isolate individual notes and choose the pitch yourself, whereas with auto-tune you choose a scale and it automatically correct to the nearest note. See this link posted in another comment : https://www.youtube.com/watch?v=9FScFKuXXM0
The interface is different with some different parameters. I don't know how the actual mathematics involved compares, but the sounds you'll get out of it are a little different. It's still a good option to listen to to hear what pitch correction on vocals might sound like in general.
Lol, obviously didn’t read the article which had an entire section dedicated to how auto-tune has such a successful brand that it’s used in speech the same as Kleenex, Google, etc
I figured whether it was meant in a genericized way or not, it's still useful to point out the specific product used to someone who's wanting to hear what it sounds like, since they each have their own sound to some extent.
