@andy A combo of google docs (to get all my ideas collected and coherent and somewhat structured) and VS code. I'm very comfortable writing directly in a markup language bc of my job, but I also don't want to do that when I'm still in "thinking about what I'm trying to say" mode.
I tried out butter docs for a second to see if I liked it better than google docs, but the whole interface assumes that I like... outline my ideas in a specific way, and I do not, so, google docs!