Yes, there are a number of options:
Under the OSC protocol TouchOSC can be used to control all of Sigmas channels and monitor section*
Under any A-FADA protocol TouchOSC can be used to control Sigma’s monitor section.*
A dedicated iOS app will be available later in 2016.
*see the Sigma Manual supplied with V126.96.36.199 software for further information. The V188.8.131.52 software zip file is available by clicking Downloads in your SSL account, next to your registered Sigma in My Products.