Remarkable VS MacDown

I don't have that much experience with it, but remarkable lets you choose any font and font size you want. Source: about 2 years ago

For Markdown, I use VSCode myself. For you, however, http://remarkableapp.github.io might be interesting. Source: almost 3 years ago

I write a LOT of documentation in Markdown for $DAYJOB. I normally use Marked2 (not free, but I paid for my license 7-8 years ago) or MacDown (free) to preview them, and to export them to PDF. Both of these programs are specific to macOS, but a web search for "markdown editor" turns up a few dozen others, for other platforms. Most of these will have an "export to PDF" function built into them. Source: 5 months ago

MacDown is free, open source and super simple. Has been my go-to Markdown editor for years. Highly recommend. Source: about 1 year ago

Macdown: https://macdown.uranusjr.com/ And here's a huge list: https://github.com/mundimark/awesome-markdown-editors. - Source: Hacker News / over 1 year ago

So I convert the PDF to Markdown format. Then I use my Markdown editor of choice, Macdown, to clean up the text and then convert the resulting document into the format that I want. Source: over 1 year ago

If you're talking about buttons to help you style your text so you don't have to remember the syntax, then MacDown will have you covered. Source: over 1 year ago