Overview

OpenDisplay is a powerful, free, and open-source solution designed to transform your iPhone, iPad, or even a spare Mac into a true second monitor for your primary Mac. It offers a compelling alternative to paid services like Duet Display and hardware dongles like Luna Display, all without the limitations of Apple's own Sidecar (which excludes iPhones and requires specific Apple IDs). Experience seamless extended desktop functionality with low latency, Retina-sharp quality, and intuitive touch input.

Key Features

• True Extended Display: Unlike mirroring, OpenDisplay allows your Mac to recognize your iOS device as a genuine second monitor, enabling window dragging, arrangement in System Settings, and a full extended desktop experience.
• Dual Connectivity (USB & WiFi): Enjoy ultra-low latency via a wired USB connection for plug-and-play simplicity, or opt for hassle-free WiFi connectivity with zero configuration, utilizing Bonjour for automatic discovery.
• Retina / HiDPI Support: Benefit from pixel-perfect display output (@2x resolution) ensuring crisp text and sharp visuals on your secondary device.
• Responsive Touch Input: Your iPhone or iPad becomes an interactive touchscreen for your Mac, offering tap-to-click, drag-and-drop functionality, and smooth two-finger scrolling that mimics a trackpad.
• Flexible Orientation: Switch between portrait and landscape modes dynamically, with the virtual display reconfiguring to match the native resolution of your device.
• High-Performance Pipeline: Leverages hardware H.264 encoding and a finely tuned streaming pipeline for minimal latency and smooth visual performance.
• Mac-to-Mac Extension: Utilize a secondary Mac (macOS 12+) as a Retina display, connecting over WiFi or a direct cable connection (Thunderbolt, Ethernet, or USB-C).
• Privacy-Focused & Self-Hosted: Your screen content remains entirely within your local network, with no reliance on external servers or accounts.

Typical Use Cases

• Boost Productivity: Effortlessly expand your workspace by adding a dedicated screen for emails, chat applications, reference materials, or secondary tool windows, keeping your primary display clutter-free.
• Cost-Effective Second Monitor: Repurpose your existing iPhone or iPad into a functional external display without purchasing new hardware or subscribing to costly services.
• Portable Workspace: Create an extended desktop setup on the go, connecting your iPhone or iPad to your MacBook via USB for instant productivity gains.
• Creative Workflow Enhancement: For designers and developers, a second display can be invaluable for tools palettes, code editors, or previewing work in progress.
• Retrofit Older Macs: Breathe new life into older Macs by using them as secondary displays for newer machines, extending their utility.