The full brewzor recipe builder app didn't really do it for me, but I love the brewzor calculator. I use it every time. It's my go-to for fine-tuning temperature and volume calcs on brew day. For pretty much everything else, I use brewer's friend. Android or no, that is my primary recipe builder. Their android app links directly to the mobile version of the website, which has worked great on both my 'droid phones. I also like to have the BJCP app just to refresh myself on a specific style when working with (or drinking) it for the first time.