Nebula Note: Markdown Editor

Markdown Editor with Mermaid

Only for Mac

$2.99

Mac

Write Markdown with live Mermaid diagrams and math — fully offline, in English, Korean, Japanese and Chinese. 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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The developer, Byoungho Kim, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

    Privacy practices may vary, for example, based on the features you use or your age. Learn More

    Accessibility

    The developer has not yet indicated which accessibility features this app supports. Learn More

    Information

    Seller
    Byoungho Kim
    Size
    28.5 MB
    Category
    Productivity
    Compatibility
    Requires macOS 13.0 or later and a Mac with Apple M1 chip or later.
    • Mac
      Requires macOS 13.0 or later and a Mac with Apple M1 chip or later.
    Languages
    English and 3 more
    • English, Japanese, Korean, Simplified Chinese
    Age Rating
    4+
    Copyright
    © 2026 Byoungho Kim
  • Privacy Policy

    • Supports

    • Family Sharing

      Up to six family members can use this app with Family Sharing enabled.

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