This is a pretty cool tool to use on your mobile device for tracking your stocks or creating a watchlist. It allows you to also enter your position and price-point offering P&L (profit & loss) data after each trading day. I use it on my Nexus 7 android tablet and love it.
Here are all of the platforms it operates on:
App Available On: iPhone | iPad | BlackBerry | Android | Android Tablet | Samsung | Samsung Tablet | Windows Phone