They are both fine in spoken form, but people avoid using them in formal writing.
If I had to choose one for a formal context, I would rather choose okay.
Which one is correct? OK or Okay?
We plan to go to Shanghai this Saturday? Are you OK with this date?
They are both fine in spoken form, but people avoid using them in formal writing.
If I had to choose one for a formal context, I would rather choose okay.
I wouldn't use either in formal writing.
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OK or okay but not Ok (which was in the title of your thread).
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.
I agree that neither would look good in formal writing. Personally, I always write "OK", never "okay" but I can't give you a good reason why I do that.