Smartwatches comparison
Compare smartwatches — health sensors, battery life, GPS, cellular, and OS with Mars Score.
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Best smartwatches right now
What matters when comparing smartwatches
This smartwatches page covers 24 products and compares the measurable fields that most often separate one model from another: display size, case size, battery life, os, ecg. 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.
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Brands in smartwatches
How to choose a smartwatch in 2026
The Mars Score for smartwatches weights health sensors (30%), battery (25%), display (20%) and platform fit (25%). Unlike phones, smartwatch choice is gated hard by ecosystem: Apple Watch only pairs with iPhone, Pixel Watch only with Android, Garmin works with both but with reduced notifications on iOS.
Ecosystem comes first, specs second
watchOS gives the deepest iPhone integration. Wear OS 5+ (Pixel Watch, Galaxy Watch) is now mature and matches watchOS on app catalog. Garmin OS and Polar OS prioritize multi-band GPS, training metrics, and 1–4 week battery over apps. HarmonyOS and HyperOS deliver 14+ day battery and excellent health sensors at half the price, but with limited third-party apps. Pick the OS that matches your phone and use-case before comparing specs.
Health sensors: ECG, SpO2, temperature, blood pressure
ECG (has_ecg) is FDA-cleared on Apple Watch, Galaxy Watch, Pixel Watch, and most Withings models — and useful for catching atrial fibrillation. SpO2 (has_spo2) is widespread but accuracy varies wildly between brands. Wrist temperature unlocks cycle tracking and early-illness detection. Blood pressure (Galaxy Watch, Huawei Watch D2) requires monthly calibration against a cuff. Buy the sensor you will actually use, not the longest spec list.
Battery: 18 hours vs 14 days
Apple Watch Series 10 and Galaxy Watch ship 18–40-hour battery. Pixel Watch is similar. Garmin Fenix and Epix Pro deliver 16–28 days in smartwatch mode, 30–60 hours in multi-band GPS. The gap is widening, not closing, because Apple and Google prioritize always-on AMOLED + cellular over runtime. If you backpack, train for ultra distance, or hate daily charging, the answer is Garmin or Polar.
Display: AMOLED vs MIP
AMOLED (Apple, Samsung, Pixel, Garmin Epix, Polar Vantage V3) is gorgeous but eats battery with always-on. Memory-in-Pixel transflective (Garmin Fenix, Forerunner 9xx) is always readable in sunlight and costs almost no battery. Many serious athletes still prefer MIP for that reason.
Multi-band GPS is the new baseline
L1 + L5 multi-band GPS (Apple Watch Ultra 2, Garmin Epix Pro, Coros Vertix 2S) fixes the urban-canyon and dense-tree-cover errors that plagued single-band watches. If you train in cities or forests, this is the spec that matters most.
How vsMars scores smartwatches
Battery and health sensors are weighted heaviest because both compound over years of daily wear. See the public formula on our methodology page, the curated picks on best smartwatches, and detailed comparisons in Mars Labs.
Frequently asked
How many smartwatches are catalogued on vsMars?+
24 smartwatches from 10 brands are catalogued in this category, each with a complete spec sheet and a transparent Mars Score.
How are smartwatches ranked?+
Each smartwatche 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 smartwatche has the highest Mars Score right now?+
ScanWatch 2 leads the smartwatches category with a Mars Score of 78.3.
Can I compare two smartwatches side by side?+
Yes — pick any two smartwatches from the category list and the comparison page renders side-by-side specs, advantages on each side, and a Mars Score verdict.