It is, I use it via android.

iPhone:
http://itunes.apple.com/us/app/tapat...307880732?mt=8

iPad:
http://itunes.apple.com/us/app/tapat...481579541?mt=8

Android:
market://details?id=com.quoord.tapatalkpro.activity

Kindle Fire:
http://www.amazon.com/gp/mas/dl/andr...lkpro.activity




There used to be a free version of it too, I'm sure you can find it by searching.