Minimal native macOS text editor with syntax highlighting. TextEdit for code.

Supports Markdown, JavaScript, TypeScript, PHP, Python, Ruby, SQL, HTML, CSS, XML, TOML, JSON, and plain text — with automatic language detection from file extension and a toolbar picker for manual override.

• Tabs — native macOS tab bar (Cmd+T to open, Cmd+1/2 to switch, Cmd+Shift+[/] to navigate)
• Search & Replace — Cmd+F to search, Cmd+Option+F for search & replace
• Duplicate — Cmd+D duplicates the current document
• Syntax picker — toolbar dropdown or Syntax menu to switch language manually
• Demand-driven highlighting — only highlights visible text for performance
• Markdown front matter — recognizes YAML front matter blocks
• Opens everything — registers for 100+ file extensions out of the box
• Native document-based app, system color mode, transparent titlebar

Requires macOS Tahoe (26). Download Marquee.app.zip from the latest release, unzip, and move to /Applications.

The app is not signed with an Apple Developer certificate. macOS will quarantine it on first launch. To remove the quarantine flag:

xattr -d com.apple.quarantine /Applications/Marquee.app

Then open normally.

swift run

Or open MarqueeTextEdit.xcodeproj in Xcode. To build a release binary:

swift build -c release