I found the phone is not the best device for brewing software. Limited real estate on the screen and LOTS of recipe data make for lots of clicking, selection menus with long lists, and a generally difficult experience. I much prefer using my ipad with iBrewmaster, it is relatively intuitive, includes lots of options, auto calculates temps and volumes, and is very flexible. I assume the same functions are included in the phone app, but again, screen size must be very limiting.