As of the technology we use out page should dynamically adjust to the size of your screen (device). So for a mobile browser the site provides the same features.
Honestly: We are currently working hard on the first CloudWok release, so we keep an eye on the mobile behaviour but we will surely optimize a lot of things here over the next weeks. So let us know once you have trouble with something and we will but a focus on that right away.
There is also a known limitation for file selection on iPhones.
A dedicated mobile App and is planned but this will take a while.