Joplin[0] supports code highlighting and TeX math. I assume you just need TeX for equations, not for the whole document. It's also open source, and works with s

Joplin[0] supports code highlighting and TeX math. I assume you just need TeX for equations, not for the whole document. It's also open source, and works with several different sync back-ends. I've been using it for some time and am very happy with it so far. 0 - https://joplinapp.org/ https://joplinapp.org/