A elegant, native PDF reader for macOS — built for researchers, students, and power users.

macOS Preview is basic. Skim lacks polish. PDF Expert is expensive and slow.

Lumen combines the simplicity of Preview with the power of paid apps — all in a lightweight, native macOS package.

• Annotation Tools — Highlight, underline, strikethrough, and sticky notes. Finally, annotate PDFs without paying for Adobe or losing your highlights when files sync.

• Bookmark Management — Never lose your place again. Organize reading progress with named bookmarks and find them instantly.

• Full-Text Search — Find any word or phrase across entire documents in milliseconds. No more scrolling through 500-page papers manually.

• Outline Navigation — Jump directly to chapters and sections. Built-in PDF bookmarks make navigation effortless.

• Thumbnail Sidebar — Visual page previews let you navigate intuitively. Find the page you need at a glance.

• Recent Files — Pick up right where you left off. Quick access to your last opened documents on launch.

# Clone the repository
git clone https://github.com/goodjin/Lumen.git
cd Lumen

# Open in Xcode
open Lumen.xcodeproj

# Build and run (Cmd+R)

• macOS 14.0 or later
• Apple Silicon or Intel (Rosetta)

Lumen follows a clean MVVM architecture:

Lumen/
├── App/              # Application entry point
├── Features/         # Feature modules
│   ├── Annotation/   # Annotation tools
│   ├── Document/     # Document management
│   ├── Outline/      # Document outline
│   ├── Reader/       # PDF reading view
│   ├── Search/       # Full-text search
│   └── Sidebar/      # Sidebar navigation
├── Infrastructure/    # Data persistence
└── Shared/           # Shared models and extensions

Contributions are welcome! Feel free to open issues and pull requests.

MIT License — see LICENSE for details.