This app appears to be more than just tethered shooting like you get with Lightroom or Aperture because it has LiveView so the DSLR LCD is being displayed on the screen of the Android device. It also appears to have total and complete control of shutter speed and aperture and focus. This app appears to be much better than the apps I've tried that just connect brackets and time-lapse.
According to discussions on the HeliconSoft forum the developers would like to build a version of this app for IOS but it is not likely because apparently IOS doesn't currently allow low level access to the USB connector like this kind of app requires.
Has anyone used this app for shooting brackets?