Haven't heard of a specific app for this site, as I do know with using Xenforo it is already quite mobile friendly, but I do recall it is a forum that can be accessed via tapatalk.
As far as I am aware, this site does not have an app listed on any stores.
I think SpiritualBattle4MySoul, you may have this site confused with another of similar name which indeed does possess an app.
This site is mobile compatible so that is always useful.