As a copy editor, I see ads for Grammarly all the time. (By now you probably know that ads are customized to you.) Grammarly is an online grammar checking, spell checking, and plagiarism detection platform. And you can start using it for free.
I downloaded the Chrome extension to check it out.
Alora D. Boerner
Freelance copy editor serving nonfiction writers, small business owners, and job seekers.