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

yongtingzhengcn-web — Sat, 25 Jul 2026 04:02:50 +0000

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

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

Step 2 — Enable USB debugging on your phone

Go to Settings → About phone and tap Build number seven times to unlock Developer options.
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

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

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

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

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

DEV Community: yongtingzhengcn-web