For Android it's in the Google Play store under the name "Sober Recovery" by the company "Internet Brands, Inc." I'll confess I'm not sure how to post a link to that as I have the Google Play app on my phone.
I don't know how to find it for iPhone, I don't have one nor do I have any experience with them aside from listening to Siri "tell off" one of my coworkers once. ("I'm getting tired of all these arbitrary questions, William!") I figured I'd stick to a phone that didn't remind me of conversations with XABF. :-P
Speaking of links, though, links to other threads in the forum open up in my browser rather than the app. That one seems trickier to fix by coding, though.