Markdown Prism

Homepage: prism.huconn.xyz

A native macOS Markdown viewer & editor with live preview, Quick Look support, and rich rendering.

Features

• Live Preview — Split-pane editor with real-time rendered preview
• GFM Support — Tables, task lists, strikethrough, autolinks
• Syntax Highlighting — 180+ languages via highlight.js
• LaTeX Math — Inline ($...$) and block ($$...$$) math with KaTeX
• Mermaid Diagrams — Flowcharts, sequence diagrams, and more
• Quick Look — Preview .md files in Finder with spacebar
• File Watching — Auto-refreshes when the file changes on disk
• Dark Mode — Follows system appearance

Screenshots

Editor + Preview

Quick Look

Install

Homebrew

brew install hulryung/tap/markdown-prism

Manual

Download the latest MarkdownPrism-x.x.x.dmg from Releases, open it, and drag Markdown Prism to Applications.

The app is signed and notarized with Apple Developer ID.

Troubleshooting: Homebrew Install/Upgrade Failure

If brew install or brew upgrade fails with:

Error: It seems the App source '.../Markdown Prism.app' is not there.

This is a name mismatch issue between the cask definition and the DMG. To fix:

# 1. Remove the broken state
brew uninstall --cask markdown-prism --force

# 2. Re-fetch the latest cask definition
brew tap hulryung/tap --force

# 3. Reinstall
brew install --cask hulryung/tap/markdown-prism

If the issue persists, install manually from the Releases page.

Build from Source

Requires macOS 14+ and Xcode 15+.

# Install xcodegen (if needed)
brew install xcodegen

# Generate Xcode project and build
xcodegen generate
xcodebuild -scheme MarkdownPrism -configuration Release build

For SPM-only build (no Quick Look extension):

swift build
swift run

Tech Stack

Component	Technology
App Shell	Swift / SwiftUI
Preview Rendering	WKWebView + HTML/JS
Markdown Parser	markdown-it
Code Highlighting	highlight.js
Math Rendering	KaTeX
Diagrams	Mermaid.js
Quick Look	QLPreviewingController + WKWebView

License

MIT