Directly copy and paste from web.
"Smappee gives you a real-time overview of the electricity consumption in your home. In our free app you’ll find out all about your total energy use and standby power consumption, at a glance. With a simple tap you’ll see what it costs you, in real-time. Want to go even further than that? Another tap on the screen and you’ll get the cost of the last 30 days."
Discussion on Whirlpool
(better add that it's 10% off the $299 price tag)