free second screen Mac

OpenDisplay: turn your spare iPhone, iPad, Mac or Android device into a second monitor for your Mac (free & open source)

OpenDisplay is a free, open-source alternative to Apple Sidecar and Duet Display. Turn your spare iPhone, iPad, Mac or Android device into a true extended display for your Mac over USB or WiFi. Retina-sharp, low latency, with touch and scroll input. No subscription, no dongle, no account. A Linux sender and a Linux receiver are in beta (sender tested on Hyprland; Sway, KDE Plasma and GNOME experimental).

2026-10-30