OpenDisplay: free open-source Sidecar alternative turns iPhone/iPad into a Mac second display
tom_doerr · x · 2026-09-13
OpenDisplay, an open-source GitHub project (2.9k stars), offers a free, self-hosted alternative to Apple Sidecar, Duet Display, and Luna Display.
- Turns iPhone, iPad, or spare Macs into a true extended display (not mirroring) for macOS
- Works over USB or WiFi with low-latency H.264 streaming
- Supports Retina HiDPI resolution plus touch and scroll input
- Fully free, no subscription; includes protocol docs and a compatibility guide
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