The Withings ScanWatch 2 is one of the more interesting wearables you can buy right now. From across the room, it looks like a traditional analog watch: stainless steel case, physical hands, a clean dial. Get closer and you notice a tiny circular display tucked inside the watch face. Press the crown, and that hidden OLED screen lights up with health data: heart rate, steps, sleep score, ECG readings.

That dual personality (elegant timepiece by day, health tracker underneath) is what makes the ScanWatch 2 worth paying attention to. If you've ever wanted medical-grade health monitoring without wearing something that screams "fitness device," this is one of the few products that genuinely delivers on that promise.

We tested it across several weeks, tracking sleep, taking ECG readings, monitoring stress, and comparing its data against both clinical references and competing devices. Here's what we found.

Key Takeaways

• 30-day battery life on a single charge, no nightly recharging required

• FDA-cleared ECG and AFib detection with a 16-channel PPG sensor for more accurate readings than most wearables

• No built-in GPS and no voice assistant. This is a health monitor in a watch body, not a smartwatch

Design and Build Quality

The ScanWatch 2 arrives in two sizes: 38mm and 42mm. Both versions use a stainless steel case, sapphire crystal glass, and a silicone band (leather and metal bands available separately). The overall weight is low for a steel watch, which helps it disappear on the wrist during sleep, a real consideration for a device you're supposed to wear around the clock.

The dial hides a 0.63-inch grayscale OLED display at 282 ppi. When the display is off, it genuinely blends into the watch face. The hands continue moving over it, which creates an unusual but attractive layered effect. Readability in bright sunlight is limited given the tiny size, but for quick stat checks it gets the job done.

The crown doubles as the main interaction point. Press once to wake the display, rotate to scroll through metrics. There's no touchscreen, which keeps the design clean and reduces accidental taps. The watch is rated at 5 ATM water resistance, meaning it handles swimming fine.

Health Monitoring

This is where the ScanWatch 2 separates itself from purely aesthetic competitors. The health sensor array is genuinely impressive for a hybrid watch.

The ECG function works by placing your finger on the crown and holding still for 30 seconds. The watch produces a single-lead electrocardiogram and flags signs of atrial fibrillation. The same feature is FDA-cleared on products like the Apple Watch Series 9, but Withings has been doing this since the original ScanWatch in 2020, and the algorithm has had time to mature.

Blood oxygen (SpO2) monitoring runs both on-demand and continuously overnight, tracking dips that might indicate sleep apnea or altitude issues. The ScanWatch 2 upgrades the PPG sensor to 16 channels (versus the original's single-channel design), which Withings claims produces more accurate readings across different skin tones and wrist positions. Independent testing has generally confirmed that improvement.

The headline new feature is TempTech 24/7: continuous skin temperature monitoring throughout the day and night. Rather than showing absolute temperature, the ScanWatch 2 tracks deviation from your personal baseline, useful for detecting early illness, tracking menstrual cycle phases, and identifying recovery patterns after intense exercise.

Sleep Tracking

Sleep is one of the ScanWatch 2's clearest strengths. If you've been looking for the best smartwatch for sleep tracking, this one makes a serious case for itself. It tracks light, deep, and REM sleep stages. The REM detection is new to this generation, and it produces a composite Sleep Score each morning in the Health Mate app.

The watch also monitors breathing disturbances overnight, flagging irregular patterns that could indicate sleep-disordered breathing. It doesn't diagnose sleep apnea (that requires a clinical test), but it gives you enough signal to know whether a conversation with a doctor might be warranted.

Because the battery lasts 30 days and the watch is light enough to forget you're wearing it, actually wearing it to sleep stops being a friction point. That's a bigger deal than it sounds. Consistent sleep data requires consistent wearing, and devices you need to charge nightly often break that streak. If you want to track your sleep long-term, a 30-day battery removes one of the main barriers.

Battery Life

30 days. That's the advertised figure and it held up in real-world testing. With ECG and SpO2 used periodically, not continuously, we saw about 26-28 days on a charge. Compared to the Whoop (which charges while you wear it via a battery pack) and the Apple Watch (1-2 days), the ScanWatch 2 occupies a completely different tier.

The tradeoff is display capability. You're not getting an always-on display or animated watch faces. The tiny OLED is purely functional. If you're used to a smartwatch you glance at for notifications and app interactions, the ScanWatch 2 will feel limited. But if battery anxiety has ever made you leave a tracker at home, that trade is worth it.

The Health Mate App

All health data flows into the Withings Health Mate app (iOS and Android). The app organizes metrics into four categories: heart health, sleep, activity, and weight. If you also own a Withings scale, blood pressure monitor, or sleep analyzer, they all sync into the same dashboard, creating a surprisingly complete picture of long-term health trends.

The interface leans clinical rather than gamified. There are no streak badges or points, just charts, trend lines, and Health Score breakdowns. That suits the watch's positioning, but users who want more coaching and guidance will find it sparse compared to the best AI health apps that contextualize data into action plans.

Health Mate integrates with Apple Health and Google Fit. It does not natively integrate with calendar tools or scheduling apps, which is where something like Lifestack becomes relevant: Lifestack reads your health and recovery data to build energy-aware time blocks in your calendar, helping you schedule focused work when your body is actually ready for it, not just when there's an opening. If you pair the ScanWatch 2's sleep and HRV data with Lifestack's scheduling layer, you get something genuinely useful for planning your day around your real capacity.

What the ScanWatch 2 Lacks

No built-in GPS. If you go for a run and want a route map, you'll need your phone. This isn't a deal-breaker for everyone. Many people run with their phone anyway, but it's a meaningful gap against watches like the Garmin Cirqa or Apple Watch Ultra that handle GPS natively.

No microphone or speaker. You cannot take calls from the watch, dictate voice memos, or interact with a voice assistant. The ScanWatch 2 does send notification alerts (vibration), but it cannot display full notification content. If you want a device that also handles communication, this isn't it.

The display is small by design, but that means reading longer text is genuinely difficult. Most interactions work fine: heart rate, step count, the current time. But don't expect to read much on the watch face itself. Also worth noting: if you're specifically looking for HRV monitoring, the ScanWatch 2 tracks HRV overnight but does not display it prominently or offer daily HRV readiness scores the way Whoop or Oura does.

Pricing

The Withings ScanWatch 2 starts at $369.95 for most color variants in both 38mm and 42mm sizes. A 38mm White and Silver option was available at $309.95 as of October 2026. The watch is sold on the Withings website and through major retailers including Best Buy.

There is no subscription fee. All health features, including ECG storage and trend analysis in Health Mate, are included without ongoing payment.

Pros and Cons

What Works

• 30-day battery eliminates the daily charging ritual

• Medical-grade ECG and AFib detection with a mature algorithm

• 24/7 skin temperature tracking is genuinely useful for illness and cycle tracking

• 16-channel PPG sensor improves SpO2 accuracy

• Classic design wears in professional and formal settings where other smartwatches look out of place

• No subscription required for any health features

Limitations

• No built-in GPS, so route tracking requires a paired phone

• Display is tiny and grayscale, with no full notifications or app interactions

• No voice control, microphone, or speaker

• Health Mate app is data-dense but light on actionable coaching

• HRV is tracked but not surfaced as a daily readiness metric

Who Should Buy the Withings ScanWatch 2

The ScanWatch 2 is a strong buy for anyone who wants medically meaningful health tracking but has no interest in a screen-first smartwatch. If you work in an environment where an Apple Watch reads as casual or a Garmin looks too sporty, this watch fits without comment.

It's also the right pick for people who have given up on fitness trackers because of charging fatigue. A 30-day battery changes the habit entirely. You put it on and forget about it, which is exactly what health tracking requires for the data to be meaningful.

If you want GPS for running, two-day battery max is fine, or you need smartwatch functionality like notifications and voice replies, look elsewhere. The Apple Watch Series 10 or a hybrid smartwatch with more screen real estate might suit you better.

Pair the ScanWatch 2 with Lifestack to put your health data to work in your calendar. Lifestack reads sleep, energy, and recovery signals to schedule your highest-focus work during peak hours, the kind of scheduling decision that the ScanWatch 2's data makes possible but can't execute on its own.

Frequently Asked Questions

Is the Withings ScanWatch 2 worth it in 2026?

Yes, for the right buyer. If you want medical-grade ECG, 30-day battery, and a watch that doesn't look like a fitness device, the ScanWatch 2 remains one of the best options available. If you need GPS or a large display, other watches serve those needs better.

Does the Withings ScanWatch 2 detect sleep apnea?

It detects breathing disturbances overnight and flags irregular patterns that may indicate sleep-disordered breathing. It does not provide a clinical sleep apnea diagnosis, but its data can help you decide whether to pursue a formal sleep study. See our sleep monitor device guide for comparison options.

How accurate is the ScanWatch 2 ECG?

The ScanWatch 2's ECG is FDA-cleared for detecting atrial fibrillation. The 16-channel PPG sensor improves accuracy over the first-generation model. Independent testing has found it performs well in controlled conditions; like all wrist ECGs, motion artifacts and poor placement can produce inconclusive readings.

Does the Withings ScanWatch 2 require a subscription?

No. All health features, including ECG records, sleep tracking, and Health Score analysis in the Withings Health Mate app, are included with the watch at no additional cost.

How does the ScanWatch 2 compare to the Apple Watch for health tracking?

Both offer ECG and SpO2. The ScanWatch 2 adds 24/7 temperature monitoring and a 30-day battery; the Apple Watch adds GPS, a large display, cellular connectivity, and a full app ecosystem. They're targeting genuinely different users.

What apps work with the Withings ScanWatch 2?

The primary companion is Withings Health Mate. The watch also syncs with Apple Health, Google Fit, and compatible third-party apps. For scheduling and planning based on your health data, Lifestack can use your sleep and energy metrics to auto-schedule your day. Check our list of best sleep tracking apps for tools that pair well with wearable data.