Both are correct โ the split is geographic
"Gray" is the standard American spelling; "grey" is the standard British one. Both are correct English, both are the same word, and both appear in every major dictionary. American publishers, newspapers and style guides use gray; the rest of the English-speaking world mostly uses grey. The old memory trick holds up well: gray for America, grey for England.
And yet a very large number of Americans write grey anyway โ out of habit, from reading British books, or because it simply looks softer. That is what this vote measures: not what is allowed, but what people actually type.
One Old English word, two spellings
The color word goes back to Old English grวฃg, and for most of its history English spelling was not standardized at all. Writers used gray, grey and several other forms more or less at random. When dictionaries began to fix spellings in the eighteenth and nineteenth centuries, both survived, and the two sides of the Atlantic gradually settled on different favorites.
Unlike color and colour or center and centre, the gray/grey split is not usually counted among Noah Webster's spelling reforms. It drifted into place more quietly, which is part of why the American preference never felt as official, and why so many Americans still feel free to choose.
The words that refuse to change
Some names keep their spelling regardless of country. The greyhound is a greyhound in American English too, and Earl Grey tea is never Earl Gray. Proper names follow their owners: the Grey Cup is Canadian, the Gray Line tour buses are American. Scientific usage mostly follows local spelling, which is why American textbooks talk about gray matter and British ones about grey matter.
Then there are the people who insist the two words mean different shades โ that grey is cooler or bluer, gray warmer or more neutral. There is no basis for this in any dictionary, but the belief is widespread enough that some designers and paint companies play along with it. In a vote like this one, that perception matters as much as the rule.
What this tally will show
Because this site counts votes from the United States, a lopsided result for gray would simply confirm the norm. A strong showing for grey would say something more interesting: that British spelling, carried by books, games and streaming, has a real foothold in American writing, at least for this one word.
Before you vote, try a quick test. Write down the color of an overcast sky without thinking about it. Whichever spelling your hand chose is your real answer.
Sources: entries for "gray" and "grey" in Merriam-Webster and the Oxford English Dictionary; Old English etymology (grวฃg) per standard etymological dictionaries; American newsroom style guides on preferred spellings.