snowdance is correct. It is not an app, just a version of the site that is more friendly to use on a smart phone.
Forum Runner is app for the Discussion Board that does make it a little more friendly for smart phones.
If there is some kind of an app that claims it is specifically for JohnDee.com (the entire site, not just the discussion board), then it has not been authorized by me to use it and I do not recommend you using it.
-John