Grammarly is great, but not yet as discerning to context as a person is. I read at ~650 wpm and love tweaking text. I write a little more slowly, but I'm great at finding and fixing mistakes, so you can just focus on your content. Proofreading, Editing, Betaing, whatever, it's all about improving your writing, be it a blog post, a news article, an FAQ page, your tinder bio, fanfiction, original work, or just checking over your website. Let me know what you're looking for - I'm looking for errors.