How to Run Samsung DeX on a Mac (One UI 8, No Monitor Needed)

Samsung quietly discontinued the official Samsung DeX app for Windows and Mac, and for a while the only way to get the DeX desktop was to plug your Galaxy phone into a real monitor. That changed with One UI 8 (Android 16): DeX is now built on Android’s native Desktop Mode, which can run on a virtual display — and that means you can put the whole DeX desktop in a window on your Mac, with nothing but a USB cable (or even just WiFi).

This guide shows you how, start to finish. It takes about ten minutes, uses only free and open-source tools, and needs no external monitor, no HDMI cable, and no HDMI dummy plug.

TL;DR — Install scrcpy + adb, enable USB debugging on your Galaxy phone, and run scrcpy --new-display=1920x1080/160. The DeX desktop opens in a Mac window. Prefer a one-click menu-bar app? Use DeXBar.

What you need

• A Samsung Galaxy phone or tablet running One UI 8 (Android 16) or newer. This is the key requirement — older One UI versions can’t render DeX on a virtual display, so this method simply won’t work on them.
• A Mac (Apple Silicon or Intel), macOS 13 or later.
• A USB cable (used at least once; wireless is possible afterward).
• Homebrew, the macOS package manager.

Why this works now (the short version)

DeX used to require a physical HDMI/DisplayPort connection because Android only entered desktop mode when it detected an external screen. Android 16’s Desktop Mode added support for virtual displays — displays that exist only in software. The open-source tool scrcpy (v4.1+) can create one of these virtual displays on demand and mirror it to your computer. One UI 8’s DeX renders onto that virtual display, and you see it in a window on your Mac. No hardware trickery required.

Step 1 — Install scrcpy and adb

Open Terminal and run:

brew install scrcpy
brew install --cask android-platform-tools

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scrcpy does the mirroring; adb (Android Debug Bridge) is how your Mac talks to the phone.

Step 2 — Enable USB debugging on your phone

1. Go to Settings → About phone and tap Build number seven times to unlock Developer options.
2. Go to Settings → Developer options and turn on USB debugging.

Step 3 — Connect and authorize

Plug the phone into your Mac with the USB cable. A prompt appears on the phone asking to Allow USB debugging — check “Always allow from this computer” and tap Allow.

Confirm your Mac sees the phone:

adb devices

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You should see your device listed as device (not unauthorized). If it says unauthorized, unlock the phone and approve the prompt.

Step 4 — Launch Samsung DeX on your Mac

Run:

scrcpy --new-display=1920x1080/160

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A window opens on your Mac showing the full Samsung DeX desktop — taskbar, resizable windows, and all. Control it with your Mac’s keyboard and mouse.

• 1920x1080 is the virtual display resolution. Bump it to 2560x1440 for more space.
• 160 is the DPI (density). Lower DPI = smaller UI, more room; higher DPI = bigger UI. 160 is a good desktop-like default; try 140–200 to taste.

That’s it — you’re running DeX on your Mac.

Optional: run DeX over WiFi (no cable)

Once it works over USB, you can go wireless as long as the phone and Mac are on the same WiFi network.

# With the phone still on USB:
adb tcpip 5555
adb shell ip -f inet addr show wlan0     # note the phone's 192.168.x.x address
# Then, cable-free:
adb connect 192.168.x.x:5555
scrcpy --new-display=1920x1080/160

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For smoother playback over WiFi, tune the stream to absorb network jitter:

scrcpy --new-display=1920x1080/160 \
  --video-codec=h265 --video-bit-rate=8M --max-fps=60 --video-buffer=50 --no-audio

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The --video-buffer=50 (a 50 ms buffer) is the single biggest fix for wireless stutter.

Prefer a one-click app? Use DeXBar

Typing commands gets old. DeXBar is a free, open-source macOS menu-bar app that wraps all of the above: it shows whether your phone is connected, lets you pick resolution and DPI from a menu, starts and stops DeX with one click, and automatically applies the WiFi smoothness settings when you’re wireless. It’s the easiest way to use this day to day.

Troubleshooting

“adb: device unauthorized”

The phone hasn’t trusted your Mac yet. Unlock it, watch for the Allow USB debugging prompt, and tap Allow (check “always allow”).

failed to connect: No route to host (wireless)

If you run a local proxy or VPN like Surge or Clash, it can hijack adb’s connection to the phone. Restart the adb server (adb kill-server && adb start-server) and add a DIRECT rule for your 192.168.* subnet in the proxy app. DeXBar’s wireless script bypasses the proxy for LAN addresses automatically.

Only display-id 0 shows / DeX doesn’t appear

Make sure your phone is actually on One UI 8 (Android 16). On older versions, DeX cannot render to a virtual display and this method won’t work.

Some apps only show a small portrait window in the middle

That’s an app limitation, not a setup problem. Those apps hard-lock portrait orientation or declare a fixed aspect ratio in their code, so DeX letterboxes them. The system toggles that could help (force_resizable_activities, ignore-orientation-request) are already on in DeX; apps with no landscape layout simply can’t be forced to fill the screen cleanly.

The DeX window feels laggy

Lower the resolution, or over WiFi add --video-buffer=50 and use --video-codec=h265 to cut bandwidth. On a weak network, raise the buffer to 100–150.

FAQ

Does this work without One UI 8?
No. Virtual-display DeX is a One UI 8 / Android 16 feature. Older One UI versions can’t do it.

Do I need an external monitor or HDMI dummy plug?
No. That was the old workaround. The virtual-display method needs neither.

Does it work on Apple Silicon Macs?
Yes — scrcpy and adb both run natively on M-series Macs.

Is it free?
Yes. scrcpy, adb, and DeXBar are all free and open-source.

Can I use my Mac keyboard and mouse in DeX?
Yes. scrcpy forwards keyboard and mouse input, and supports clipboard sharing.

Will this work on a Pixel or other non-Samsung phone?
The virtual-display trick is specific to how Samsung ships DeX on One UI 8. Stock Android’s Desktop Mode on Pixels currently still expects a physical external display.

Wrapping up

Samsung may have dropped the desktop DeX app, but thanks to One UI 8’s virtual displays and scrcpy, running Samsung DeX on a Mac is easier than it ever was with the official tool — no monitor, no adapters, and it works over WiFi. If you want the one-click experience, grab DeXBar on GitHub, star it if it helped, and let me know which One UI 8 devices you get it working on:

👉 https://github.com/yongtingzhengcn-web/dex-for-mac