For macOS
Markdown, as it should be.
Read Markdown in Finder’s Quick Look, in a style that suits you. Open it in your preferred editor when it is time to make a change.
Quick Look Markdown previews in your style.
Open in your preferred editor.
Complex documents handled automatically.
So Markdown includes GitHub-style tables and task lists, offline diagram rendering, a standalone reader, printing and Save as PDF. There is no account, advertising, analytics or subscription.