Both smartwatches and fitness trackers belong to the same general category of wearable technology, although they each have their characteristics. You can use both to measure your activity and provide helpful analytics for improving your fitness, but fitness trackers have traditionally been the go-to devices for this purpose. Meanwhile, smartwatches serve as miniature extensions of your smartphone, allowing you to make and receive calls, check and respond to WhatsApp messages and emails, listen to music, and more. If you have the cash, you know what to do: get a top-tier smartwatch that can compete with top-tier activity trackers.