Help me w/freedback on RPN Calc? (Free) new iOS App

[madstamm]

Dear RPN/HP fans:

Would you help me out with some feedback on two special features my RPN calculator App?

(yes its free, in app purchases for add-ons only: OCR scanner and Periodic Table):
App Store: https://apps.apple.com/ch/app/fr-shtouch...04478?l=en

I love the speed of my HP48G, and had the idea to combine RPN with some features that need a touchscreen:
**1:** buttons flick up and down for 2nd/3rd functions
**2:** buttons slide left/right > allows choosing operands freely from stack

If you have some time to play around with these features, could you give some feedback what you like? and maybe what you would like to see? definitely open for suggestions.

Mike

PS: old threads on this topic, calculator was previously $1.99:
https://www.hpmuseum.org/forum/thread-15395.html
https://www.hpmuseum.org/forum/thread-15461.html