Withings has been putting medical sensors inside analog watches for years. The ScanWatch 2 proved it could be done elegantly. The ScanWatch Nova asks a different question: can it be done luxuriously?
A full stainless steel case, ceramic rotating dive bezel, sapphire crystal, 100-meter étanchéité, and a metal bracelet in the box. This is a dive watch that happens to contain an approuvé par la FDA ECG, continuous SpO2, 24/7 temperature monitoring, and a 35-day battery. At $599.95, it competes with mechanical dive watches on aesthetics and smartwatches on health intelligence.
Nous l'avons porté for six weeks straight -- boardroom, beach, pool, and sleep. Here is everything nous avons trouvé.
Verdict rapide
Withings ScanWatch Nova
The most premium hybrid health watch ever made. Medical-grade sensors inside a dive watch you would genuinely choose for its looks alone.
En un coup d'œil
35
Day autonomie
Longest of any de grade médical wearable
100m
Étanchéité
10 ATM — real dive watch territory
FDA
Cleared ECG
Single-lead AFib detection in 30 seconds
24/7
Temperature tracking
TempTech24/7 continuous monitoring
Matériel: Built Like a Dive Watch, Not a Gadget
The Nova is a 42mm, 63-gram instrument. Full stainless steel case, ceramic rotating bezel with dive markings, and a domed sapphire crystal that catches light like a proper luxury timepiece. In the hand, it has the satisfying weight and cold-metal feel of watches costing twice as much.
It ships with both a stainless steel metal bracelet and an FKM rubber dive strap -- a generous pairing that usually requires separate purchases in the traditional watch world. The bracelet uses a butterfly clasp with micro-adjustments. The rubber strap is supple enough for comfortable suivi du sommeil.
100 Meters Is Not Marketing
The 10 ATM / 100m rating means the Nova is pressure-tested for actual recreational diving, not just rain and hand-washing. The ScanWatch 2 manages 5 ATM (50m). That difference matters if you snorkel, freedive, or simply want a watch that shrugs off any water encounter without a second thought.
The 0.63-inch grayscale OLED at 282 PPI sits at 12 o'clock. It is intentionally small and deliberately monochrome -- this is an analog watch with a health display, not a smartwatch pretending to be analog. Notifications appear truncated but legible. Health metrics render sharply at 282 PPI, a meaningful density upgrade over the ScanWatch 2.
Analog hands sweep across the dial driven by a quartz movement that consumes almost no battery. The combination of analog timekeeping and a tiny OLED is the fundamental reason this watch runs for a month while Apple Watch runs for a day.
| Spec | Details |
|---|---|
| Case size | 42mm (Nova) / 39mm (Nova Brilliant) |
| Weight | 63g (42mm, without strap) |
| Material | Stainless steel case, ceramic rotating bezel, sapphire crystal |
| Display | 0.63" grayscale OLED, 282 PPI |
| Étanchéité | 10 ATM / 100m |
| Battery | 30-35 days typical |
| Sensors | PPG Gen 3 (16-channel), ECG, SpO2, TempTech24/7, accelerometer |
| Included straps | Stainless steel bracelet + FKM rubber band |
| Price | $599.95 |
| Subscription | None required (Withings+ optional at $9.95/mo) |
De grade médical Sensors: The Invisible Clinic
Beneath the sapphire caseback, the Nova houses Withings' most advanced sensor array to date. The PPG Gen 3 optical fréquence cardiaque sensor uses 16 channels -- up from 4 in the ScanWatch 2 -- improving signal quality during movement and across a wider range of skin tones.
FDA-Cleared ECG
Touch the stainless steel bezel electrode for 30 seconds. The single-lead ECG classifies normal sinus rhythm, atrial fibrillation detected, or inconclusive. Clinical validation shows sensitivity and specificity above 95% for AFib detection.
For Withings+ subscribers ($9.95/mois), the ECG recording can be sent for cardiologist review directly through the Health Mate app. A board-certified cardiologist reviews your trace and returns a written interpretation -- typically within 24 hours. This transforms a consumer screening tool into a lightweight telemedicine pipeline.
What the ECG Does Not Detect
The single-lead ECG screens for one arrhythmia: atrial fibrillation. It cannot detect ventricular tachycardia, heart block, or ischemic changes. A "normal" result means AFib was not found in that 30-second window. It does not mean your heart is healthy. Always seek medical attention for chest pain, palpitations, or dizziness.
SpO2: On-Demand and Overnight
Blood oxygen saturation is available as a manual spot check (30 seconds) or continuous overnight monitoring. The overnight mode feeds into Withings' sleep apnea screening algorithm, detecting cyclical desaturation patterns consistent with moderate-to-severe obstructive sleep apnea.
TempTech24/7: Continuous Temperature
This is the Nova's most differentiated sensor. Unlike wearables that sample température cutanée only during sleep, TempTech24/7 monitors continuously -- day and night. The health implications are significant: temperature deviations can signal illness onset 24-48 hours before symptoms, and continuous baselines enable more accurate menstrual cycle tracking with ovulation predictions.
Temperature and Illness Detection
A sustained 0.5-1.0 degree Celsius elevation above your personal baseline, detected continuously by TempTech24/7, can precede cold and flu symptoms by one to two days. The Nova flags these deviations in the Health Mate app. It is not diagnostic, but it gives you a meaningful early warning system.
HealthSense 4 OS: Software That Interprets, Not Just Displays
The Nova runs HealthSense 4, Withings' latest firmware platform, which adds several features over the ScanWatch 2.
AI Vitality Indicator synthesizes fréquence cardiaque, HRV, temperature, SpO2, qualité du sommeil, and activity into a single daily score. Think of it as Withings' answer to WHOOP's Score de récupération or Garmin's Body Battery -- a unified readiness metric that tells you whether today is a push day or a rest day.
REM Sleep Detection joins light, deep, and awake stages. The 16-channel PPG enables more granular cardiac pattern recognition during sleep, improving REM classification accuracy. Score de sommeil now factors REM proportion into its 0-100 calculation.
Guided Breathing sessions use real-time fréquence cardiaque feedback to guide you through structured breathing patterns aimed at lowering acute stress. Sessions range from 1-5 minutes.
Cycle Tracking combines menstrual logging with continuous temperature data to predict fertile windows and ovulation. The 24/7 temperature baseline provides meaningfully better predictions than wearables that sample only during sleep.
reviewing the Withings ScanWatch Nova for de grade médical health monitoring in a luxury dive watch
Unify all your wearable data and get personalized AI health insights in one place.
40+ Auto-Recognized Activities cover walking, running, swimming, cycling, and dozens of other movement patterns. The Nova detects and logs them without manual intervention. No GPS onboard -- it relies on phone-connected GPS for mapped routes.
The Ecosystem Advantage
The ScanWatch Nova feeds data into the same Withings Health Mate app used by the Body Scan scale, BPM Connect pression artérielle monitor, and Thermo thermometer. If you own multiple Withings devices, Health Mate becomes a genuinely comprehensive personal health dashboard -- weight, composition corporelle, pression artérielle, temperature, cardiac rhythm, and sleep all in one place.
ScanWatch Nova vs. ScanWatch 2
The Nova is not a replacement for the ScanWatch 2 -- it is a premium tier above it. Here is exactly what the extra $250 buys.
| Feature | Feature | ScanWatch Nova ($599.95) | ScanWatch 2 ($349) |
|---|---|---|---|
| Material | Material | Full stainless steel + ceramic bezel | 316L stainless steel |
| Crystal | Crystal | Domed sapphire | Flat sapphire |
| Étanchéité | Étanchéité | 10 ATM / 100m | 5 ATM / 50m |
| PPG sensor | PPG sensor | Gen 3, 16 channels | Multi-wavelength, 4 channels |
| Temperature | Temperature | TempTech24/7 (continuous) | Skin temp (sleep only) |
| Battery | Battery | 30-35 days | 30 days |
| Included straps | Included straps | Metal bracelet + FKM rubber | Silicone or leather |
| OS | OS | HealthSense 4 | HealthSense 3 |
| AI Vitality Indicator | AI Vitality Indicator | Yes | No |
| REM detection | REM detection | Yes | No |
| Weight (42mm) | Weight (42mm) | 63g | ~40g |
| ECG | ECG | FDA cleared | FDA cleared |
| Sleep apnea detection | Sleep apnea detection | Yes | FDA cleared |
The Nova Brilliant Alternative
Prefer a smaller case? The ScanWatch Nova Brilliant offers the same sensor suite in a 39mm case with a more jewelry-forward design. Same $599.95 price, same health capabilities, different aesthetic. It replaces the dive bezel with a polished finish aimed at smaller wrists and dressier contexts.
Withings+ Subscription: Worth It?
All core health features work without any subscription. The optional Withings+ at $9.95/mois adds:
- Cardiologist ECG reviews -- a board-certified cardiologist interprets your ECG recordings
- Advanced health reports with longitudinal trend analysis
- Workout programs and guided sessions
- Priority support
For most users, the free tier is sufficient. If you record ECGs regularly and want professional interpretation without scheduling a cardiology appointment, Withings+ offers genuine value. The cardiologist review alone would cost $50-150 per visit through traditional channels.
Autonomie: The Unfair Advantage
Nous avons mesuré 32 days in real-world use with SpO2 overnight monitoring enabled, notifications active, and 2-3 ECG recordings per week. Disabling overnight SpO2 pushes toward 35 days.
This is not an incremental advantage over smartwatches. It is a categorical difference. Apple Watch Ultra 2 manages 36 hours. Galaxy Watch Ultra hits 60 hours. The Nova runs for a month. You charge it roughly 12 times par an. You never take it off to charge before bed, which means your sleep data has zero gaps.
Why Hybrid Beats Smartwatch on Battery
Analog hands driven by a quartz movement consume near-zero power. The tiny OLED activates only on demand. There is no always-on color display, no cellular radio, no onboard GPS constantly polling satellites. Every design decision optimizes for continuous health monitoring, not smartphone-on-your-wrist functionality.
Who Is This Watch For?
The Nova occupies a specific niche. It is for people who want a genuinely attractive watch that also happens to be a de grade médical health monitor. It is not for people who want to reply to messages from their wrist, navigate with turn-by-turn directions, or track ultramarathon splits with onboard GPS.
If you are choosing between the Nova and an Apple Watch, you are choosing between two fundamentally different philosophies: a watch that monitors your health quietly for a month, or a computer on your wrist that does everything for a day.
Notre note
The Nova earns its score through an unprecedented combination: the most advanced hybrid health sensor suite on the market, wrapped in a dive watch that commands genuine respect as a timepiece. It loses points for the absent GPS, the limitations of a tiny monochrome display, and a price that puts it in competition with both capable smartwatches and respectable mechanical dive watches.
✓Pros
- approuvé par la FDA ECG with optional cardiologist review via Withings+
- TempTech24/7 continuous temperature — meilleur de sa catégorie for illness and cycle tracking
- 30-35 day battery eliminates charging anxiety and ensures unbroken data
- 10 ATM / 100m étanchéité — genuine dive watch capability
- Stunning stainless steel + ceramic build rivals traditional luxury watches
- Ships with both metal bracelet and FKM rubber strap
- 16-channel PPG Gen 3 improves accuracy across skin tones
- HealthSense 4 with AI Vitality Indicator and REM sleep detection
- No mandatory subscription — $599.95 one-time, all core features included
- Withings ecosystem unifies scale, BP monitor, thermometer, and watch data
✗Cons
- No GPS intégré — relies on phone for route mapping
- 0.63" grayscale OLED limits notification usability
- $599.95 is premium territory — ScanWatch 2 offers most health features for $349
- 63g weight is noticeable vs. lighter bracelet d'activités
- No recovery analytics comparable to WHOOP or Garmin charge d'entraînement
- Stadification du sommeil accuracy trails dedicated sleep trackers like Oura
- ECG detects only atrial fibrillation — no other arrhythmias
- HealthSense 4 AI features are new and unproven long-term
Frequently Asked Questions
No. Every core feature — ECG, SpO2, TempTech24/7, suivi du sommeil, activity, AI Vitality Indicator — works at the $599.95 purchase price with no ongoing fees. The optional Withings+ ($9.95/mois) adds cardiologist ECG reviews, advanced health reports, and workout programs.
The Nova (42mm) has a ceramic rotating dive bezel and a sportier aesthetic. The Nova Brilliant (39mm) replaces the dive bezel with a polished finish for a dressier look. Both cost $599.95, share identical sensors and health features, and run HealthSense 4. Choose based on wrist size and style preference.
The Nova adds TempTech24/7 continuous temperature, 16-channel PPG Gen 3, HealthSense 4 with AI Vitality Indicator and REM sleep, 100m étanchéité, and premium materials. If you value the dive watch build and continuous temperature monitoring, it justifies the $250 premium. If you primarily want ECG and SpO2 in a hybrid watch, the ScanWatch 2 at $349 delivers the core experience.
Yes. The 10 ATM / 100m rating covers recreational swimming, snorkeling, and shallow freediving. It tracks swim activities automatically. Do not use the ECG function underwater — the bezel electrode requires dry skin contact.
It synthesizes similar inputs — HRV, fréquence cardiaque, temperature, SpO2, sleep, and activity — into a daily score de préparation. It is newer and less battle-tested than WHOOP Recovery (8+ years of refinement) or Body Battery (5+ years). Early impressions are positive, but long-term accuracy validation is still pending. The advantage is getting this metric without a subscription.
