The ultimate value diary is amazing, my lifesaver. U can't.get it on android market, I got it off slideme.com and it cost about £1.50. It's in us dollars tho. U buy it and its goes into a storage locker and then u.download SAM which is like a market, then its in the storage locker section there. Abit confusing but 110% worth it. It Has a calculator, exercise, barcode scanner, database, weight chart and it tells u at the rate u are losing, how many weeks it should take u to get to goal, I love that! Xx