Nebula Note: Markdown Editor

Nebula Note is a clean, focused Markdown editor for the Mac with a live preview that renders diagrams and math as you type.

WRITE AND PREVIEW SIDE BY SIDE • Live preview with syntax-highlighted code blocks and one-click Copy buttons • Tables, task lists, table of contents, footnote-style links and images • LaTeX math rendered with MathJax ($E = mc^2$)

MERMAID DIAGRAMS, BUILT IN • 19 diagram types: flowchart, sequence, class, state, ER, Gantt, pie, mind map, Git graph, user journey, timeline, quadrant, sankey, XY chart, block, C4, kanban and more • A dedicated diagram viewer with zoom, fit-to-window and full screen • Export any diagram as SVG, PNG or high-resolution PNG @2x

STAY IN THE FLOW • Focus mode hides everything but your words • Document outline for jumping between headings • Snippets that expand with Tab, plus autocomplete for common Markdown • Word goals, reading time and detailed document statistics • Find & replace with regular expressions • One-click table formatting, line sorting and empty-line cleanup

MADE FOR YOUR MAC • Dark mode and custom CSS for the preview • Export to standalone HTML or PDF • Works fully offline — Mermaid and MathJax are bundled in the app • Available in English, Korean, Japanese and Simplified Chinese

Your documents never leave your Mac. No accounts, no tracking.

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