Yes, it catches a few things that Grammarly doesn't catch (or have to pay premium to view) like missing the closing parenthesis, or forgetting a period at the end of the sentence (I'm using Grammarly on mobile; it's possible that I didn't see the error.) We have a ton of cases still to add, and since it's entirely focused on punctuation and small details, we hope it should catch more than standard grammar checkers.