Nixie tubes use layered vacuum tubes to show digits and have a characteristic orange glow.
Nixie Calculator provide basic arithmetic functions consistent with the original devices - with a few modern additions.
The companion Watch App uses swipe gestures to allow the calculator buttons to be a more practical size.
The calculator is a truncating type to fit numbers into the fixed display.
Please enjoy this calculator that combines one of the first display technologies with state of the art in Smart Phones and Watches.