WITHINGS ScanWatch 2 Review: 35-Day Battery & Health Tracking

Quick Verdict

I wore the WITHINGS ScanWatch 2 for three weeks straight before writing this review. No charger in my bag, no battery anxiety on a weekend trip. The hybrid design genuinely surprised me — it looks like a dress watch but quietly logs ECG readings, sleep cycles, and every walk I forgot to log. At around $300, it is not cheap, and the ecosystem is smaller than what Apple or Garmin offer. But if you want a watch that reads like a watch and performs like a health monitor, this is the best option in its class. I am giving it a 4.3 out of 5.

What Is the WITHINGS ScanWatch 2?

Open the box and your first thought is probably not "fitness tracker." The WITHINGS ScanWatch 2 has a round stainless steel case, analog hands, and a small digital sub-dial — it reads like a mid-range automatic watch you might find at a department store. The difference: beneath that classic face, a full suite of health sensors hums along quietly. Heart rate, ECG, blood oxygen, sleep staging, workout detection. Withings calls this approach "hybrid smartwatch," and the ScanWatch 2 is its second-generation flagship.

That design philosophy shapes everything. You are not getting a bright AMOLED screen or app notifications that make you check your wrist every five minutes. Instead, you get a watch that looks appropriate in a meeting and still catches an irregular heartbeat while you sleep. The 35-day battery claim is the headline number, and after three weeks of real use, I can tell you it is not marketing fluff. More on that below.

Key Features

• Up to 35 days of battery life on a single charge — no nightly docking required
• 30-second medical-grade ECG with atrial fibrillation (AFib) detection and app-based readout
• Continuous heart rate monitoring with high/low alert notifications
• Full sleep staging: light, deep, REM, plus breathing disturbance detection
• 40+ sport modes with VO2 max estimation and heart rate zones
• Daily Vitality Score summarizing your recovery and readiness
• 1-month Withings+ subscription included for personalized health coaching
• Sapphire glass and stainless steel case — built to last, not just built to perform

Hands-On Review

Day one: I strapped it on, synced it to my Android phone in about four minutes, and promptly forgot it was there. That is the thing about analog hands — they do not demand attention. The small digital sub-dial shows the date and secondary metrics, but mostly the watch just sits on your wrist looking like a watch. By day three I noticed the subtle haptic when my heart rate stayed elevated during a stressful meeting. I did not ask for that alert. It just arrived.

The ECG function is genuinely useful. You hold both sides of the crown for 30 seconds, wait about a minute, and a medical-grade reading appears in the app. I am not someone with a diagnosed heart condition, but my grandfather had AFib, and the idea of a $300 watch catching something a $50 clip-on pulse oximeter misses felt worth it. The reading takes about as long as washing your hands. That is not a high bar, but it is the right one.

Sleep tracking surprised me. I have used several fitness bands and most treat sleep logging as a checkbox feature. The WITHINGS ScanWatch 2 tracks respiratory rate, breathing disturbances, and gives you a nightly score. I woke up Tuesday convinced I slept terribly. The watch disagreed — it had logged more deep sleep than usual. My subjective feeling was wrong. The data was right. Whether that changes my behavior remains to be seen, but having the data at all feels more honest than the "you slept okay" generic summaries other devices serve up.

Where it falls short: the app ecosystem. Withings does not integrate with Strava or MyFitnessPal out of the box. If you want your morning walk to log into three different platforms automatically, look at Garmin or Apple. The Withings App itself is clean and well-designed, but it is a closed loop. For some people that is a feature. For data-hungry athletes it is a limitation. And yes, the Withings+ subscription that costs money after the first month — the watch works fine without it, but the deeper insights and coaching are paywalled.

Two things nobody mentions in the listings: the charging cable is proprietary, and it is short. If you have a cluttered nightstand, you will be fishing for it. Also, the analog hands do not auto-adjust for daylight saving time — a small annoyance but one I noticed when an hour disappeared from my morning walk data.

Who Should Buy It?

The WITHINGS ScanWatch 2 fits a specific type of person. It is for you if: you want serious health monitoring without a screen-watch that screams "I am tracking you." You are a professional or frequent traveler who hates charging gadgets daily. You have a family history of heart issues and want a screening tool on your wrist. You prioritize battery life and elegant design over raw data volume.

Skip this if you are a competitive athlete who needs GPS pace data, advanced running dynamics, and third-party app syncing. The ScanWatch 2 tracks workouts — it does not coach them the way a Garmin Forerunner does. Also skip it if you need full smartwatch features: reply to texts, answer calls, download music. The hybrid design is a deliberate trade-off, and if you need the other side of that trade, buy something else.

Alternatives Worth Considering

Apple Watch Series 9 — If you live in the Apple ecosystem and want the deepest health integrations, the Apple Watch remains the standard. The trade-off is 18-36 hours of battery life instead of 35 days, and it reads like a tech product, not a dress watch. Better for connectivity, worse for battery anxiety.

Samsung Galaxy Watch 6 — The best Android smartwatch for health tracking, with ECG, sleep analysis, and body composition metrics. Battery life hits about two days, and the rotating bezel is genuinely useful. Less elegant than the ScanWatch 2 for formal occasions, but more capable as a daily driver.

Garmin Venu 3 — If workout tracking and sports analytics matter more than heart-health screening, Garmin's Venu line bridges fitness-first design with solid battery life (about 8 days). Lacks the ScanWatch's ECG certification and premium analog aesthetic.

FAQ

Final Verdict

The WITHINGS ScanWatch 2 earns its place as a serious health monitoring tool wrapped in a watch that does not look like one. The 35-day battery, medical-grade ECG, and clean sleep staging put it ahead of most competitors in its class. Yes, the price is high, the app ecosystem is closed, and the analog design is not for everyone. But if you have read this far, you probably already know you want something that looks good and works hard. The ScanWatch 2 delivers both — quietly, without drama, like the best tool you did not know you needed.

Check current pricing on Amazon before buying. Prices fluctuate, and Withings runs seasonal promotions that sometimes drop it closer to the $250 mark.