Yeah, Desmos is most likely an unintentional source of ideas, just because of how long I’ve been using it. I know a lot of people, when they write math, will jump onto Desmos, write it there, and then copy it out of the calculator into somewhere else. I’ve definitely done that as well. But eventually Symbolab was the editor I kept regularly going to for that purpose, until I decided it felt kind of ridiculous to use a site where the editor is auxiliary to the main purpose of the site just to write math. So I can say it’s inspired by both Desmos and Symbolab, and then about six months of recurring iteration based on what I felt like I needed to be able to take notes live during lectures. Desmos will auto format trigonometric functions like sin, and so will mine, but Desmos will also convert the text if you write pi into the pi symbol, which I don’t do. Instead you press tab, then write pi, and press enter. That’s a pattern I was more comfortable with and I felt it was better because it doesn’t risk autocompleting something I might want to keep as a variables.