There's also Microsoft Editor to which I switched from Grammarly. I'd say it gets in the way a bit less than Grammarly but the suggestions popup/window sometime

There's also Microsoft Editor to which I switched from Grammarly. I'd say it gets in the way a bit less than Grammarly but the suggestions popup/window sometimes gets buggy. It only works in Chromium browsers, so unfortunately no Firefox add-on :/