Mac · wired second display · not Sidecar

A wired Sidecar alternative for the iPad you already own.

Send HDMI or USB-C video from your Mac into Phosphor. The iPad becomes a second display that does not care if conference Wi-Fi falls over, and does not smear code through a wireless encoder.

Download on the App Store Get Phosphor Touch (Beta)

Use iPad as a wired second display for Mac.

Immune to Wi‑Fi drops: The picture is a cable, not AirPlay or Sidecar on a crowded network.
Text stays sharp: Direct video avoids wireless compression artifacts on terminals, docs, and UI chrome.
Touch & Trackpad Control (Beta): Pair with Phosphor Touch for real-time touchscreen taps, window drag, and precision trackpad pointing.
Custom resolution (Pro): Negotiate the desktop feed so supersampling does not soften the image.

Mac desktop on an iPad through Phosphor as a wired second monitor

What you need

USB-C iPad (iPadOS 17+) and a UVC capture dongle. MacBooks without HDMI should use a USB-C video-in card with Power Delivery. Set the extra display on the Mac; Phosphor handles the iPad side. For interactive input, download Phosphor Touch for Mac (Beta).

Phosphor Touch for macOS (Beta) · Phosphor Pro vs standard UVC apps · Hardware routes · Back to Phosphor