New Avid Control app is excellent!

[Dr.Strangelove]

@misjavw

Meanwhile, I am sticking with TouchOSC which I can highly recommend as an iPad (or other tablet) addition to control Nuendo.
Pro’s: Highly customisable, very stable, (never crashed), easy setup, it is free!
Cons: It takes some time to program, not really fancy visually, track names and parameter names / values are not grabbed from Nuendo

strictly speaking it’s not free - but it is pocket money price

also

Touch OSC control for Cubase 10.5 Pro