Pixelbot

Get the Desktop app (just look for Pixelbot Dashboard on the macOS App Store)
https://apps.apple.com/gb/app/pixelbot-dashboard/id1560523831
Try before you buy?
Get the free iPhone app (just look for Pixelbot Lite on the App Store)
https://apps.apple.com/us/app/pixelbot-lite/id1558282729
Useful for monitoring state of a desktop screen
When Mac app is running, if the pixel beneath the cursor on your mac changes, a notification will be sent to this app
When is this useful:
- online queueing
- auctions
- notifications of other notifications (e.g. desktop notifications, slack, other apps)
- end of renderings
- end of long computer operations
- end of uploads/downloads