HP-16C app for iPhone/iPad - whom to call at HP?

[CFA Newbie]

I have developed the below RPN calculator for iPhone (completely free) because I was sick of not having my HP 12C by my side.

There’s a few RPN calculators available, but they all seemed to not maximise the potential of the touch interface of an iPhone. Hopefully some of you might like mine. Its still in beta, I need to amend some minor items like auto lifting the stack in some scenarios (I never realised how important auto lift is for rpn calculators to beat their prefix brethren - I’ve got a mostly intuitive auto lift feature now, but need to mosify it slightly).

If there is significant interest in HP 16C , I can do something similar. Its pretty easy (hardest part is UI).

RPN 30 by Ashok Khanna
https://itunes.apple.com/au/app/rpn-30/i...13517?mt=8

Make sure to read the instructions on the app store - it took me a long time to come up with a very easy to use rpn calculator