opendisplay
A free macOS app that turns an iPhone, iPad or spare Mac into a real extended second display for your Mac. It is an open-source alternative to Sidecar and Duet Display.
Share on XLicense: GPL-3.0
Overview
OpenDisplay is a free, open-source macOS app that turns an iPhone, iPad or spare Mac into a real extended second display for your Mac. macOS treats the device as a separate monitor, not a mirror. It connects over USB or WiFi and supports touch input. It is presented as a self-hosted alternative to Apple Sidecar, Duet Display and Luna Display, with no account or dongle.
Key features
- True display extension, with mirroring as an optional mode
- USB connection or WiFi found automatically through Bonjour
- Retina resolution matched to the device panel
- Touch input: tap to click, drag and two-finger scroll
- Spare Mac as a display through a small Receiver app
Best for
Mac users who want an extra screen from a device they already own without a subscription. USB needs a data-capable cable, and WiFi needs Local Network permission on both devices.
- Upstream
- peetzweg/opendisplay
- Fork on GitHub
- Guo-astro/opendisplay
- Upstream stars
- 4.9k
- Category
- Apps and everyday utilities
- License
- GPL-3.0
- Forked
- 2026-09-28
- Sync status
- In syncLast synced 2026-09-29
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