Withings ScanWatch

Clinical-grade for ECG, SpO2 and resting HR, but continuous and exercise HR is weak, so this is a spot-check medical device more than a training tool.

Peer-reviewed validation vs Polar H10 confirmed ScanWatch-specific: overall MAPE 5.1%, mean bias 1.5 bpm and CCC 0.796, but accuracy fell to 10% MAPE, CCC 0.164 and 6.6 bpm underestimation during walking; acceptable for consumers, not for clinical HR. JMIR Formative Research 2022 free-living HR validation (Giggins et al.) ↗

Broad passive health coverage for a hybrid (ECG, SpO2, HR, four-stage sleep, breathing disturbances, temperature, cycle) but no on-watch GPS or maps and few apps.

ScanWatch reflective oximeter measured SpO2 at clinical grade (RMSE 2.97 to 3.00%, bias about 1 to 1.6%, r 0.944 to 0.954, meeting FDA <3.5% and ISO thresholds) and in continuous mode could detect the short SpO2 drops that occur in people with sleep apnea, adding medical-grade metrics beyond a normal tracker. JMIR 2021 SpO2 validation (Kirszenblat et al.) ↗

Class-leading endurance for a watch with a display; the 30-day claim is reviewer-confirmed in light use, dropping to about 10 days under heavy notification and workout use.

Reviewer measured roughly 10% daily drain (about 10 days) with all features enabled and found the 30-day claim realistic in normal use, so it comfortably lasts a week and often several. Trusted Reviews ↗

Light, thin and silent hybrid that testers wore comfortably day and night including workouts, making it easy to keep on for sleep tracking.

Coach describes the 38mm model as small and light, sitting snugly against the wrist, with a silicone band comfortable to wear at all times including workouts. Coach ↗

Polished Health Mate app with Apple Health and Google Health Connect export that feeds cleanly into a coach like Vora, but on-watch apps are minimal and a Withings+ upsell exists.

Reviewer rated it 4 out of 5 as an attractive hybrid with a good mix of health and fitness smarts plus basic smartwatch features, while noting notifications are cramped and it is less feature-rich than a full smartwatch. Trusted Reviews ↗

Reasonable for a medical-grade hybrid with no required subscription and long useful life, though the current lineup starts higher than the old From $169 label.

ScanWatch 2 lists at 349.95 to 369.95 and the cheaper ScanWatch Light at 249.95, both with core health features free and Withings+ optional at 9.95/month. Withings US store ↗