Ken Yeung at The Next Web:
Fitbit has released an iOS app update that will enable users to monitor their activity right from their iOS device, no longer necessarily requiring the purchase of its hardware. Called Mobile Tracker, the feature is likely a competitor to what Nike’s Move iOS app offers. It’s also only available to those with iPhone 5S devices, since it’ll be using the built-in M7 chip installed on it.
Smart. Once you get a few months of data invested in the FitBit ecosystem, it’s a natural step to go grab a FitBit tracker.
Still, I really like Moves if you like seeing the step or location data, but you don’t care about the fitness element. I wouldn’t use Moves on a iPhone 4S or 5 though; without the M7 co-processor it really thrashes your battery.