

I use Apostrophe markdown editor. It’s basically a plaintext editor with Markdown syntax highlighting and a rendered preview mode. It is the same formatting language you can use for posts and comments on Lemmy (and the other place).
Honestly, I’m just obsessed with Markdown. You can write it anywhere you can type. It’s just structured plaintext that you can easily convert to other formats (html, odf, pdf, etc.) Write it in Notepad. Use it text messages. Put it on Facebook. There is no native support for the format in any of these places, and it doesn’t matter.
I do all my writing in Markdown now. It keeps me focused on my document content and structure.
I just checked on this. Your display choices in the app are limited to light, dark and sepia. It would be nice if you could enter custom styles for display, but I don’t see that option. That might be an interesting feature to contribute—it’s FOSS!
As far as styling the converted output, it depends. You can style
HTML
withCSS
. Pandoc has options to style other formats with custom templates.