iA Writer

iA Writer files are ordinary Markdown documents on disk. Drag the active file from Finder or from the title-bar proxy icon onto Marked to open it.

Because the preview path matches the editor file, live updates behave like any other watched Markdown document.

Marked understands most include workflows that rely on recognizable path patterns; advanced /block-style markers from iA Writer are interpreted when they match syntax Marked already supports for modular documents.