Also like that it's just CSS for the theming - I'm kind of particular about my typography so I like that I can set it up the way I want it.
I sync to a private repo and use an (albeit hacky) combination of GitJournal (for creating new .md files in a /mobile folder) and SpeckEditor (for editing files in the repo) on mobile.
For me, WYSIWYG is essential, since my notes contain a lot of math, and I don't want to stare at LaTeX source all day. For that reason, stopped using Overleaf in favor of Typora [1] for a while, but grew out of it as my note-base became large enough to need a good wikilink system.
Quarantine gave me enough free time to build my own note-taking app [3]. So, these days, when I get frustrated with my note-taking app, I have only myself to blame :)
[1] https://prosemirror.net/ [2] https://github.com/benrbray/prosemirror-math [3] https://noteworthy.ink/
During quarantine I've been working on an open-source alternative called Noteworthy (https://noteworthy.ink/). It's not quite ready for release yet, but keep an eye out the next few months! The source is here, you can technically build it if you try hard enough: (https://github.com/benrbray/noteworthy)
The goal is to be as modular and extensible as possible. People shouldn't have to keep re-inventing file trees, Markdown parsing, etc.. This is my first large TypeScript/Electron project so code feedback is always welcome, especially in the early stages.
In the meantime, you might be interested in Zettlr, an open-source editor with similar features which is a bit more stable.
If you don't mind me asking, what features in particular are you looking for in an editor?