Smart Watchs Below is list of Smart Watches & Trackers Reviews and Comparisons I have written so far Fitbit Tracker Comparison Zip vs One vs Flex 2 vs Charge HR Fitbit Alta vs Alta HR Fitbit Tracker Comparison Alta vs Charge 2 vs Blaze vs Surge Fitbit Blaze vs Fitbit Surge Jawbone UP2 vs UP3 vs UP4 Misfit Link vs Jawbone UP Move Polar M400 vs Polar M600