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StephenLovino / BetterCast

Turn spare devices into real extra displays for your Mac or Windows PC — iPad, iPhone, Android, Windows, Linux, even an old 5K iMac. Free, open-source Sidecar/Duet/spacedesk alternative. No subscriptions, no cloud, no accounts.

android windows macos ios hevc screen-mirroring macos-app virtual-display deskreen target-display-mode duetdisplay second-display duet-display-alternative sidecar-alternative

Updated Oct 26, 2026
Swift

josepacelli / opendisplay-android

Star

Port do App do OpenDisplay para Android

android kotlin macos h264 screen-mirroring mediacodec external-display jetpack-compose second-monitor extended-display duet-display-alternative sidecar-alternative spacedesk-alternative opensidecar

Updated Nov 3, 2026
Kotlin

cuongpham1 / ipad-iphone-second-monitor-ios12-free

Star

Free open-source iOS 12 iPad/iPhone second monitor for Mac. OpenDisplay-compatible client over USB/Lightning & Wi-Fi. Sidecar/Duet alternative for old devices.

macos swift open-source lightning usb iphone ipad free ios12 virtual-display duet-display opendisplay second-monitor second-display legacy-ipad sidecar-alternative

Updated Oct 12, 2026
Swift

raiseCatError / meowdisplay

Sponsor

Star

Mac Everywhere, On Whatever Display. MeowDisplay 2.0: open-source Mac sharing and control on iPhone, iPad and another Mac. Android in closed testing.

Updated Nov 3, 2026
Swift

akinalpfdn / osplay

Star

Use a Mac or a Windows PC as a real extended display for another computer on your local network. Free and open source, macOS ⇄ Windows, no cloud, no account — a Sidecar and spacedesk alternative.

Updated Oct 31, 2026
C++

efekurucay / anydisplay

Star

Turn any Android phone or tablet into a second monitor, touch screen and pen tablet for Mac and Windows. USB or Wi-Fi, hardware HEVC, pressure-sensitive pen, open protocol.

android windows macos open-source stylus hevc screen-mirroring second-screen virtual-display drawing-tablet superdisplay-alternative second-monitor extended-display sidecar-alternative

Updated Oct 25, 2026
Rust

pedroaqs / legacypad-display

Star

Turn an iPad Air 1st generation (A1474, MD785LL/B, iOS 12.5.8) into a wired Retina second display for macOS

macos swift h264 lightning external-monitor videotoolbox usbmuxd ios12 virtual-display screencapturekit second-display ipad-air ipad-air-1 legacy-ipad wired-display sidecar-alternative

Updated Jul 18, 2026
Swift

flywalk4 / qwovi

Star

📱 Turn your iPhone into a second screen for your Mac: live SwiftUI widgets (music, CPU/RAM, calendar, weather, crypto, Claude Code limits), a real extended display over USB/Wi-Fi, and a cursor that crosses onto the phone. Source-available Sidecar alternative with custom JS widgets, free for noncommercial use.

Updated Sep 28, 2026
Swift

Venelinhr / opendisplay

Star

Use an old Mac as a second display. Adds a macOS receiver to OpenDisplay — an iMac 27" 2017 runs at true 5K (5120x2880), pixel-sharp with no scaling, over WiFi.

macos swift retina hevc imac screen-sharing virtual-display second-display sidecar-alternative imac-5k

Updated Sep 17, 2026
Swift

nmt3325 / ipad-iphone-second-monitor-ios12-free

Star

fork of ipad-iphone-second-monitor-ios12-free. added AWDL connection feature to use an old iPad/iPhone as a Mac second display without a local network. great thanks to https://github.com/cuongpham1/ipad-iphone-second-monitor-ios12-free

macos swift ios peer-to-peer network-framework ios12 awdl second-display sidecar-alternative