Open-source opendisplay turns iPhone/iPad into a free Mac second display, rivaling Sidecar
peetzweg · github · 2026-09-14
opendisplay, trending on GitHub with 3,343 stars (+314 today), is a free, open-source alternative to Sidecar and Duet Display that turns an iPhone or iPad into a true second monitor for Mac over USB or WiFi.
Key features:
- Low-latency H.264 streaming built on VideoToolbox
- Retina HiDPI support
- Touch input support
Written in Swift and using ScreenCaptureKit for capture, it targets Mac users who want a free option instead of paying for Duet Display.
Related event: OpenDisplay: Free Open-Source Tool Turns iPhone/iPad into Mac Second Screen(2 posts)→
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