The iPhone 5s and its M7 motion coprocessor are opening the doors to a new wave of fitness apps that take advantage of the low-power motion processing available with the motion chip. One of the first apps to use the data from the M7 is the Argus - Motion and Fitness Tracker from Azumio.
The big draw of Argus for many people will be the step tracking, which is pulled from the M7 on the iPhone 5s and from GPS with older devices. I've tested the Argus step data on the iPhone 5s, and it compares favorably with the data from the Fitbit Flex -- with one caveat. For the step tracking on the iPhone to be accurate, you have to always have your phone on your person, which can be a big problem for some folks.
Besides steps, Argus also tracks your weight,
