I'm not crazzy on Grammarly. What is correct English grammar? Is there such a thing? One of the great aspects of English is its flexability and ever changing use. What was correct English 50 years ago is not acceptable today (in some parts). I like to think of English as free flowing and everchnaging. Malleable if you will. I think if you were to run any of the great classics or popularist books through Grammarly, the software would find many, many issues.