Surprised coming into this that I don't see anyone mentioning vale[0]. I've been using it for ~4 years now and love it. I use grammarly briefly when it came out and liked the idea. Admittedly it has more polish than vale for people writing in google docs, &c. Still, I stick with Vale. Is there any case for moving to Harper? [0] https://vale.sh/
It’s missing a default rule set with rules that are generally okay without being too opinionated.