Our mobile applications are all free! Let me just clear up one thing on this topic: the applications don’t really control the dataloggers, but they are used to set them up and read data.
CobaltSet, OCEAView, and all OCEASOFT’s mobile applications are entirely free and developed to run on both iOS and Android. You may download them and have a look even if you don't yet have any OCEASOFT datalogger products. That will enable you to see for yourself how easy they are, and even to test basic features using “demo mode”, which simulates missions in OCEAView so you can see how things work.