Is it cosier or cozier?

If you’re using American English spelling, then use cozier. For British English, then the comparative form of the adjective cosy is spelled cosier.

The root adjective is spelled cozy or cosy, depending on the variant of English. It’s spelled cozy in American English and cosy in British English. It means “warm, comforting, and snug.”

You can select your language region in the QuillBot Grammar Checker, so you can always be confident that you have spelled cozier/cosier correctly.