Calc3 is a beautiful simple tape calculator for your iPhone with a uniq user interface.
Now available in the Appstore.
New in 3.x:universal App for your iPhone and iPad
more keys on bigger screens (iPhone 6 and iPad)
iPad Pro support
Slide Over and Split View support
Landscape mode for iPhone
lots of sientific funtions
decimal, hexadecimal, binary and octal conversion and calculations
uniq and easy percentage concept
customizable function keys
scrollable calculation history
calculation history can be shared
adjustable key click sound volume