Fitness Trackers comparison
Compare fitness trackers — GPS, heart rate, sport modes, battery life, and waterproofing.
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Best fitness trackers right now
What matters when comparing fitness trackers
This fitness trackers page covers 17 products and compares the measurable fields that most often separate one model from another: battery life, display size, weight, gps, sport modes. Use the filters to narrow the field, open a product page for the complete readout, and use a head-to-head page when two models are close enough that a category-wide rank is not enough.
How to read the ranking
Mars Score is a normalized category score, not a laboratory replacement and not a claim that the highest-ranked product is right for every buyer. A high score indicates broad strength across the weighted fields; a lower score can still be the better choice when one specific requirement matters more than the average.
Read the scoring methodology →Popular fitness trackers comparisons
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Brands in fitness trackers
How to choose a fitness tracker in 2026
The Mars Score for fitness trackers weights fitness (50%), battery (30%) and design (20%). The category sits between basic step counters and full sports watches — if you mostly want sleep, steps, heart rate and 10–30 day battery without paying for multi-band GPS, a tracker is the right answer.
GPS or no GPS
has_gps is the dividing line. Trackers without GPS (Fitbit Inspire 3, Amazfit Band 7) clip to your wrist for 10–20 days but rely on your phone for route mapping. Trackers with GPS (Fitbit Charge 6, Garmin vivosmart 5) work standalone for outdoor runs at the cost of shorter battery.
Heart rate, SpO2 and sleep
Continuous HR and SpO2 sensors are now table stakes; sleep tracking accuracy varies wildly between brands. Whoop's 5.0 strap is the screenless outlier — it does no notifications and focuses entirely on recovery scoring. See Mars Labs for sleep-stage accuracy comparisons against polysomnography.
Battery in days, not hours
Battery is measured in battery_days because the entire category's value proposition is "set it and forget it for two weeks." Anything under 7 days starts blurring the line with smartwatches. Anything over 21 days is genuinely set-and-forget.
Water resistance and form factor
5 ATM (50 m) is the minimum useful rating for swim tracking. Below that, only splashes and rain. Display size (display_size_in) and weight matter less than they do on a smartwatch — most users hide trackers under a sleeve.
Glossary cross-links
For terminology like CADR, ATM ratings or burn-in see /en/glossary. For buying-context buying advice see Buyer's Guides.
How vsMars scores fitness trackers
Mars Score for fitness trackers weights fitness sensors highest because that is the category's whole purpose. See methodology for the per-spec weighting.
Frequently asked
How many fitness trackers are catalogued on vsMars?+
17 fitness trackers from 10 brands are catalogued in this category, each with a complete spec sheet and a transparent Mars Score.
How are fitness trackers ranked?+
Each fitness tracker is scored by the category-specific Mars Score formula — a weighted average of normalized specs with the weights published on the methodology page. No editorial hand-tuning.
Which fitness tracker has the highest Mars Score right now?+
PACE 3 (as fitness tracker) leads the fitness trackers category with a Mars Score of 83.2.
Can I compare two fitness trackers side by side?+
Yes — pick any two fitness trackers from the category list and the comparison page renders side-by-side specs, advantages on each side, and a Mars Score verdict.