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Celestial

Introduction

Celestial is a purpose-built Markdown editor designed for engineers. It combines the simplicity of Markdown with powerful features like syntax highlighting, Mermaid.js diagram support, and bring-your-own LLM writing assistants.

Installation

Section titled “Installation”

Celestial is currently only available for MacOS as a .dmg, which can be found on the website

Quick Reference

Section titled “Quick Reference”

Headings

Section titled “Headings”
  • # → H1
  • ## → H2
  • ### → H3 (and so on through H6)

Text Formatting

Section titled “Text Formatting”
  • **bold text** → bold text
  • _italic text_ → italic text
  • `inline code` → inline code
  • [link text](url) → link text

Lists & Structure

Section titled “Lists & Structure”
  • - or * or + → Bullet list
  • 1. → Numbered list
  • > → Blockquote
  • --- → Horizontal rule

Code & Diagrams

Section titled “Code & Diagrams”
  • ``` → Code block
  • ```javascript → Code block with syntax highlighting
  • ```mermaid → Mermaid diagram

Special Features

Section titled “Special Features”
  • / → Open AI assistant
  • <ComponentName> → Create JSX block (MDX files)
  • ![alt](image.jpg) → Insert image

Keyboard Shortcuts

Section titled “Keyboard Shortcuts”
  • Cmd + b Toggle file drawer
  • Cmd + , Open Settings