Is there a good iPhone app that counts calories?

I'm on a mission to lose weight, and I've heard that there's an iPhone app that counts the calories as you lose them during exercise. Is this a proper app and if so, what is it called?

Myfitnesspal

You can find a link to the app here: http://www.myfitnesspal.com/

Hope that helps!

Calorie count king
or my fitness pal

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