Is there any way to control Mac volume from Apple Watch?
Solution 1:
I've used MacID with great success on my Pebble smartwatch but they also have support for Apple Watch. It's $4 but TOTALLY worth it!
https://macid.co/
The watch app requires the companion iPhone app to sync with the desktop app and control the volume and track selection.
And that's not all, the iPhone to Mac has a proximity sensor so you can set your computer to unlock AS YOU APPROACH IT and lock if you get up to walk away.
I hope this answer helps :)
Solution 2:
I use https://cherpake.com/remote-for-mac/ Runs on the Mac, with companion apps on the iPhone and Watch. It's honestly not great, but it can do this.
Once you've set it up, changing the volume consists of launching the app on the Watch, selecting the computer (yes, it makes you choose it even if you only have one), selecting "KeyPad", selecting "Volume", then tapping volume buttons on the display. Turning the crown does nothing.
So it's not exactly super convenient.
The app also has rather annoying screens if you don't pay to unlock it.