For demoing Cuety I have used Capture in the past. I run this on my laptop and connect via either Art-Net or sACN.
You can use any 3rd party visualisation program that supports Art-Net or sACN. Capture is cross platform so can be run on my MacBook or a Windows machine if needed. Take a look at their website as they do have a 1 universe version which may be reasonably priced - I know they have recently updated their software so I am not sure if prices have changed.
Good luck and hope you are enjoying using Cuety!
Greetings Zoë