OK vs Okay | Difference & Spelling Published on October 8, 2024 by Tom Challenger, BA Revised on November 7, 2024 OK and okay are alternative spellings of the same word and are both correct. Whichever spelling you decide to use, the most important thing is to be consistent throughout your text. If you’re supposed to be following a particular style guide, make sure to check if it specifies using either “OK” or “ okay .” OK vs okay in a sentence examples The food was OK/ okay but ... Discover the difference between OK vs. Okay . Learn clear definitions, examples, and key points to master vocabulary for writing, texting, and conversations. OK is an English word that denotes approval, acceptance, agreement, or indifference. It is derived from a misspelling of "all correct" and became popular in the 1840s as a political slogan.