We have posted this before on these forums, but here is an American dialect quiz that has proven to be pretty accurate.
Rather interesting, though I feel it has a lot of limitations. The first question I got, for example, was, 'How would you address a group of two or more people?' but it didn't let me select multiple answers. I may very well say, 'You,' 'You lot,' 'You guys,' or, 'Y'all,' for that at any given time, and I'm not sure I'd use one of those options predominantly. Another question asked, 'What do you call an easy high school or college class?' and though I was able to select, 'Other,' I'm not certain I even
have a word or phrase for such a course (though if I did, it certainly wasn't among their options).
And then there was, 'How do you pronounce
crayon?' among the answers for which were, 'With two syllables—sounds like
cray-ahn,' and, 'With two syllables, where the second syllable rhymes with
dawn.' These are the same answer for me, and unless Americans just have a really weird idea of how "
ahn" is pronounced, I can't imagine how there'd be a difference for anyone.
That said, fudging my way through these sorts of poorly-worded questions, which gave me a dialect most similar to Spokane, Buffalo, and Boston.