Haha! It's a forum plug-in so that users can access the forum while on the go (i.e. iOS or Android). It's $2.99 but it's a nice app in my opinion and I don't even use it for too many forums, it's just super convenient and developers are always working to improve it so it at least feels like my $3 went to the work.
I don't think this forum allows the plug-in for Tapatalk (which is free for forum owners). I'm just SO connected to the clan and the clan activties I like to check everywhere I go. I check this forum MORE than I check FaceBook & Twitter combined.
