Overview

The Withings ScanWatch 2 is built for health-conscious adults who refuse to give up the look of a classic timepiece for a fitness tracker. It sits in a unique category: a traditional analog watch with a hidden OLED sub-dial and medical-grade sensors inside — available on Amazon.com with FDA-cleared ECG monitoring, continuous heart rate, SpO2, skin temperature, and sleep tracking packed into a 38mm or 42mm stainless steel case with a sapphire glass crystal. It’s aimed squarely at anyone who wants serious cardiovascular health monitoring without wearing something that looks like a miniature smartphone on their wrist.

The ScanWatch 2 is the successor to the original ScanWatch, and Withings upgraded nearly every sensor on board. The new model adds a TempTech 24/7 continuous skin temperature module, a 16-channel multi-wavelength PPG sensor (up from the original’s single-wavelength array), REM sleep stage detection, and an updated AFib detection algorithm that received an ECG clearance update from the FDA in 2025. The result is a hybrid watch that now competes directly with dedicated medical-grade wearables — not just fashion hybrids.

Key Specifications

Withings ScanWatch 2 ECG and Heart Health Monitoring

The ECG capability is the centerpiece of the ScanWatch 2, and it’s one of the few hybrid smartwatch implementations to receive FDA clearance in the United States. To take a reading, you place a fingertip on the watch crown for 30 seconds; the device then classifies the recording as normal sinus rhythm, AFib, or inconclusive — and generates a full PDF-exportable ECG trace you can share with a physician. According to Withings’ published clinical data, the ECG electrode achieves sensitivity and specificity performance comparable to leading medical-grade wearables. In 2025, Withings pushed a firmware update that further refined the AFib detection algorithm specifically for the US market, adding more granular classification detail to recordings.

Beyond on-demand ECG, the ScanWatch 2 monitors heart rate continuously throughout the day and night using its 16-channel PPG sensor. Reviewers at Android Authority noted that heart-rate tracking is solid for everyday wellness — resting heart rate, overnight trends, and daily patterns read clearly in the Withings Health Mate app. The watch also tracks HRV (heart rate variability) during sleep, which Withings uses to power its Cardio Health Score metric. The SpO2 sensor measures blood oxygen saturation during sleep, and the skin temperature module (TempTech 24/7) runs continuously — making this one of very few hybrid watches to offer all three cardiovascular markers simultaneously with no additional subscription required for basic data.

Sleep Tracking and Wellness Monitoring

Sleep tracking is where the ScanWatch 2 genuinely distinguishes itself from the competition. The upgraded sensor array in this generation adds REM sleep stage detection — a capability absent from the original ScanWatch and still missing from most hybrid competitors. The watch logs total sleep duration, light sleep, deep sleep, REM time, interruptions, and a Sleep Score. According to a reviewer at Android Authority who compared the ScanWatch 2’s sleep data against an Oura Ring 3, the sleep stage readings were closely comparable, with the Withings occasionally overestimating total sleep by counting time in bed as time asleep. That said, the overall sleep architecture data — particularly REM duration and deep sleep percentage — tracked well against a dedicated ring-form sleep tracker.

The temperature sensor adds another wellness dimension: Withings uses continuous overnight temperature data to power a cycle tracking feature for women’s health (menstrual cycle phase prediction) and to flag potential illness or inflammation events when temperature deviates from a personal baseline. Combined with SpO2 overnight monitoring, which screens for potential breathing irregularities associated with sleep apnea, the ScanWatch 2 offers a genuinely comprehensive passive health monitoring suite in what looks like a dress watch.

Battery Life and Everyday Wearability

Withings rates the ScanWatch 2 at up to 35 days of battery life — and unlike a full-display smartwatch, the hybrid form factor supports that claim by keeping the OLED sub-dial off most of the time and relying on low-power analog hands for timekeeping. In practice, real-world battery life depends heavily on notification volume and how frequently health sensors are polled. According to Android Authority’s reviewer, the ScanWatch 2 “easily surpassed two full weeks with regular workouts, notifications, and feature use” — roughly half the marketed maximum but still far ahead of any competing full-display smartwatch in the same price range. With lighter notification loads and GPS disabled, 30 days is achievable. Recharging takes approximately 2 hours via the USB-C magnetic dock.

As an everyday wearable, the ScanWatch 2 is genuinely comfortable. The 38mm case at 34.6g is light enough to sleep in without noticing it — important for accurate sleep tracking. The stainless steel case, sapphire crystal, and interchangeable silicone or leather bands give it the look of a sub-$500 Swiss dress watch. The 0.63-inch OLED sub-dial displays the day, date, and health notifications but is deliberately minimal; it doesn’t support app installs, turn-by-turn navigation, or music control. Smart features are limited to incoming call alerts and app notifications — which will be a dealbreaker for some buyers but a deliberate design choice for those who want fewer distractions on their wrist.

Activity Tracking and App Experience

The ScanWatch 2 automatically detects over 40 sport modes and tracks steps, distance, active calories, and elevation via its altimeter. For cardio workouts, it uses connected GPS from a paired smartphone rather than built-in GPS — meaning pace and distance data require carrying your phone. According to Withings’ official spec sheet, the watch uses its high dynamic range accelerometer to detect workout start and stop automatically, which means it will log a walk or run without requiring manual activation. The lack of onboard GPS is the most significant limitation for dedicated runners or cyclists who want wrist-only tracking.

The Withings Health Mate app is the data hub for all sensor readings, and its presentation of health data is unusually polished for a wearable at this price. The Cardio Health Score, Sleep Score, and Activity Score are each presented with trend graphs and plain-language explanations — making the data accessible for people who aren’t already immersed in fitness tracking. The app integrates directly with Apple Health and Google Health Connect, so data flows into the broader health ecosystem without manual export. Withings+ is an optional $9.95/month subscription that adds cardiologist review sessions and additional coaching features — but all raw sensor data, scores, and trend graphs are available without a subscription.

How Does It Stack Up Against the Competition?

The ScanWatch 2 operates in a narrow but growing segment of health-focused hybrid watches. Here’s how it compares to the most relevant alternatives at similar price points.

Is the Withings ScanWatch 2 Worth It?

The ScanWatch 2 is the right watch for one specific type of buyer: someone who wants medical-grade cardiovascular monitoring — FDA-cleared ECG, AFib detection, continuous heart rate, SpO2, and skin temperature — but refuses to wear something that looks like a smartwatch. It’s an exceptional tool for health-monitoring dads, anyone managing cardiovascular risk, or adults who simply spend their days in environments where a full-display smartwatch looks out of place. The 35-day battery ceiling (with 2-week real-world longevity in active use) and the analog aesthetic are genuinely differentiating features no competitor at this price currently matches.

Who should look elsewhere: active athletes who need built-in GPS for route tracking will find the ScanWatch 2’s connected-GPS reliance frustrating. Budget-conscious buyers can get ECG and solid health tracking from the Samsung Galaxy Watch 7 for around $280. And anyone who wants a rich app ecosystem, Apple Pay, or music streaming on their wrist will find the ScanWatch 2’s deliberately minimal smart features limiting. But as a health-monitoring timepiece designed to be worn 24/7 without charging anxiety, it remains one of the most capable devices in its category.

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Sarah MitchellSenior Editor

Sarah has spent more than a few decades — she's not saying how many — in home design, with a sharp eye for products that deliver real quality without the inflated price tag. Her passion is finding the hidden gem that makes everyday life genuinely better.

Content produced with AI-assisted research — editorial policy →