There's loads of markdown viewers, you just don't identify them as that.
Try copying some markdown into these places:
- A reddit comment
- Microsoft Teams
- Slack
- Discord
- Google Docs
- Discord
- Notion
- Facebook Messenger (although only on desktop I think)
Etc.
And Obsidian! Best of them all.
Matrix, Discourse. I wish that Signal supported it though.
Hahaha, I know, right? Someone might seriously float this argument.
Gee, here's a Markdown file on my computer that I'd like to read (formatted as intended). Since I don't have a lightweight reader for Markdown, let me just...
1. Open it up in a text editor
2. Launch a browser
3. Navigate to some page that allows Markdown comments.
4. Log in to comment.
5. Find something to comment on.
6. Create and paste into a comment.
7. Post the comment.
8. Read.
SO EASY!