MarkOne
MarkOne is a lightweight Markdown viewer and editor for macOS. It opens Markdown files quickly, renders them in a clean preview, lets you make focused edits, and exports polished PDFs — without setting up a workspace or library. Use it for README files, notes, documentation drafts, project plans, and any plain-text Markdown you want to view or adjust with native Mac controls.
Most Markdown apps want you to adopt a whole workspace — accounts, sync, project setup — before you can read a single file. When you just need to open a .md, see it rendered cleanly, and maybe export a PDF, that overhead is friction you did not ask for.
An open-and-go Markdown app that keeps the source file intact and stays out of the way. MarkOne renders instantly, offers simple edit and split-view modes, four reading appearances, and one-click PDF export — a plain file-based workflow with no accounts, sync, or setup.
- → Fast native macOS document experience
- → Clean rendered Markdown preview
- → Simple edit and split-view modes
- → Light, dark, sepia, and system-aware reading appearance
- → Formatting toolbar with syntax-highlighted code blocks
- → Quick Look preview support for Markdown files
- → PDF export for sharing finished documents
- → Plain file-based workflow — no accounts, sync, or project setup