I have tried the Mobile App for Viking Clan on a couple of devices. I personally feel that there is much room for improvement in this area... At least as many options as when using a normal browser...like the sorting of the Clan Feed or even showing the Battle Arena or the Guild Wars. I can still complete me dailies and play the game, which is fun, but it takes the social aspect out of it. As well as the chat.
We're currently working on a "framework" for all of our games to bring our mobile versions up to spec with our desktop versions. A lot of the improvements can be seen in the Pirate Clan iOS app and once the framework is complete then we can bring that across to the other games with relative ease. Keep an eye out for that announcement.