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Pro Customizable real-time preview
Marked can show formatted text in real time. It can be customized with built-in styles, using your own CSS templates or as a multi-column view. You can easily switch between different style with keyboard shortcuts.
Pro MultiMarkdown & CriticMarkup support
Marked supports advanced functionality of MultiMarkdown as well as CriticMarkup.
Pro Multiple export options
Marked allows exporting to HTML, RTF, PDF.
Con Only for macOS
This program doesn't work with other platforms besides MacOS, so Windows and Linux users will have to look for something else.