Free iPad app: http://itunes.apple.com/us/app/motion-math-hungry-fish/id483049169?mt=8&uo=4&at=10l6SU
Free iPhone app: http://itunes.apple.com/us/app/motion-math-hungry-fish/id483049169?mt=8&uo=4&at=10l6SU
Paid iPad app: https://itunes.apple.com/us/app/splash-math/id600426787?mt=8&uo=4&at=10l6SU