"the price" you mean free? Just register with Grammarly and copy-paste your text into the web window to do the basics. Sure, it'll bypass the deep checks, but you'll get some proper alterations.

I know it's an extra step, but you can also opt to toss it into Grammarly after the fact, pre-post.

If it's for WORG, ditch it and learn the context for markup. It's what I've been doing for my tech docs at work that don't require graphics; the interpreter transforms it to HTML.