Someone else mentioned that, but it doesn't have a markdown interpreter / renderer (as far as I can tell).
Notion renders markdown as you type. Markdown and render view are not independent, if that's what you mean. I use Notion daily for personal use and for work and, so far, it is the best tool I have ever encountered for the job. Notion is not just a markdown editor, but a fully-fledged markdown compliant wiki to create knowledge bases, for instance. Offline support is lacking though.
There are other markdown editors with a split editing / preview pane, which I think I prefer. It makes it easier to copy and paste the markdown to another editor (or to Dev.To).
I understand. You can export markdown from Notion though. 😉
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