I've found about LanguageTool through one of your previous articles and have been using it for about two months.
Actually, I'm using both Grammarly and LanguageTool (simultaneously), and it's curious when they have different suggestions.
I haven't fully made up my mind, but I do like that LT also corrects me in Portuguese, and that's definitely a selling point for me!
PS: I also didn't know how an em dash was called untill now and I'm shocked how I never noticed that they use it without spaces in English 😳 Portuguese is similar to Polish in that aspect. Glad to learn that! Thanks!