Using tablet as a controller, suggestions?

Anyone have leads on how to use a tablet as a controller for a Vuo composition.

I just tried Yam Display which, despite an outstanding bug request, seemed to work fine … I can put buttons and do mouse tracking on the display. But it is tethered over USB and I’d like something wireless. I don’t need to be tied to IOS, I don’t really mind which tablet.

I was imagining something perhaps communicating using OSC.

I know these things can be built, but preferably looking for an existing app that allows for simple user interface design … background image, buttons, sliders, mouse tracking and so on.

Any hints?

Ahhh, just found TouchOSC