Whats the most accurate Pedometer for Iphone?

TheForsakenNinja

Ok so i currently am having trouble figuring how much calories i burn when walk because i get different results.Stepz tells me i burned 226 calories,Argus tells me i burned 167 calories,& Pacer tells me i burned 243 calories.Im so confused,Do y'all know what is the most accurate Pedometer app??

Edit:Because of this,i never add my exercise as much when i log on to MyFitness