It's called PACalculate .. it's in the Apple and Google stores .. it's free .. it's also a bit on the nerdy side, so Caveat Utilitor ...
RCF didn't write it, but apparently monetarily supported it.
PAcalculate - (https://itunes.apple.com/us/app/pacalculate/id793460437?mt=8)
https://play.google.com/store/apps/details?id=com.PAcalculator&hl=en_US
There are calculators for RGBA/RGBW hues, cable loss, delay times, DMX addresses, pinout specs ... certainly worth free ...
RCF didn't write it, but apparently monetarily supported it.
PAcalculate - (https://itunes.apple.com/us/app/pacalculate/id793460437?mt=8)
https://play.google.com/store/apps/details?id=com.PAcalculator&hl=en_US
There are calculators for RGBA/RGBW hues, cable loss, delay times, DMX addresses, pinout specs ... certainly worth free ...