Your Mac. Extended to iPhone Duo.

Move a Mac window onto your iPhone Duo and keep it beside your work. extnd requires the free Mac companion and connects over your local network.

The lake and dunes photograph used on the extnd connection screen

Made for iPhone Duo.

extnd gives your Mac an extended desktop on iPhone Duo, rather than mirroring the screen you already have. The free Mac companion is required and stays open while you use the display.

You need iOS 17 or later, macOS 14 or later, and both devices on the same local network. One iPhone can connect at a time.

Point your camera at your Mac.

Open the Mac companion and choose Start hosting. The pairing QR code opens automatically. Allow Screen Recording when macOS asks.
On iPhone, choose Pair with Mac and scan the code with the camera inside the Connection panel.
Move a window onto the new display. Arrange it in macOS System Settings → Displays.

Pairing is saved on your devices. Advanced manual connection is available if you cannot use the camera.

More room on the inner display.

The larger inner display on iPhone Duo gives windows more room. extnd streams at up to 60 fps; responsiveness and frame delivery depend on your devices and local network.

Use your Mac’s mouse and keyboard, or enable optional touch control with Accessibility permission on the Mac. extnd does not support 120 fps, USB or internet streaming, audio streaming, or an iPhone keyboard.

Your desktop stays between your devices.

The desktop stream uses an encrypted local connection. There is no extnd account or cloud relay, and the apps contain no advertising, tracking, or developer analytics.

Read the app privacy policy for pairing storage, permissions, Apple services, and how this website differs from the apps.