Do I need a subscription to use a fitness tracker?

It depends on the brand. Fitbit's Charge 6 and Inspire 3 include a 3-month Google Health Premium trial but gate some advanced insights behind a paid plan afterward, and reviewers we read note this repeatedly. WHOOP requires an ongoing membership to function at all. Garmin's Forerunner 165, by contrast, delivers its core training metrics with no mandatory subscription.