This app is another version of RGBctrl:
https://itunes.apple.com/tw/app/rgbctrl/id993476824?mt=8
With this app you are able to control your multiple(for now is 4) Arduino, to controlled RGB LEDs via Wifi.
The app contains 9 different predefined colour choices:
URL Request Format:
Red: http://yourIP/$a
Orange: http://yourIP/$b
Yellow: http://yourIP/$c
Green: http://yourIP/$d
Blue: http://yourIP/$e
Indigo: http://yourIP/$f
Purple: http://yourIP/$g
Rainbow: http://yourIP/$h
None: http://yourIP/$i
This version is primarily ment for >= iOS 9 (swift 3.0).