None of the tools you mention does anything similar to the tool shared in this post. What similarity do you find apart from the obvious and peripheral similarit

None of the tools you mention does anything similar to the tool shared in this post. What similarity do you find apart from the obvious and peripheral similarity that they are all rendering latex? The first and third tools require you to sign up. How exactly do you create a distributable Markdown file there that can be read both in editor as text and viewed as HTML in browser? The second link does not recognize Markdown.