Galaxy S4 and iPhone 5s more reliable than current wearable fitness devices at measuring activity, finds study

If you were thinking about buying a fitness band, a university study suggests you probably shouldn’t bother: it found that the Samsung Galaxy S4 and iPhone 5s measure activity more reliably than most current fitness bands.

The study by the University of Pennsylvania (via EurekAlert!) tested the ability of the phones to measure steps on a treadmill and compared the results to six dedicated fitness bands. The two smartphones had a margin of error of 12.9%, while the error rates of the fitness bands ranged up to 22.7%.

The study tested the Galaxy S4 and iPhone 5s against the Nike Fuelband, Jawbone UP24, Digi-Walker SW-200, Fitbit Flex, Fitbit One and Fitbit Zip. Only the FitBit One and Zip performed significantly better than the two smartphones.