Withings ScanWatch Review: a health-focused hybrid watch that doesn’t scream ‘smartwatch’

I’ve been using the Withings ScanWatch 42 mm in black for a few weeks, and it’s basically my compromise between a normal watch and a smartwatch. I came from full-screen watches (Fitbit and a Galaxy Watch), and I was tired of charging every day and wearing what looks like a tiny phone on my wrist. The ScanWatch caught my eye because it looks like a regular watch but still does ECG, heart rate, and sleep tracking.

In practice, it really feels more like a classic watch that happens to track health in the background. You don’t get a big touchscreen, apps, or animated faces. You get hands, a small round PMOLED screen at the top, and a sub-dial for steps. So if you expect an Apple Watch clone, this is not it. If you mainly care about health metrics and the time, it’s a better fit.

Setup with the Withings Health Mate app (I used Android) was straightforward. Open the app, add the device, follow a few prompts, update firmware, done. Sync has been stable for me as long as Bluetooth stays on and the app isn’t killed in the background. Notifications came through reliably once I whitelisted the app from battery saving, which is important if you’re on Android with aggressive power management.

Overall first impression: it’s a health tracker disguised as a watch, not a mini smartphone. For my use (steps, HR, ECG every now and then, sleep, and basic notifications), that’s exactly the balance I wanted. But if you’re expecting rich apps, music control, or a bright always-on screen, you’ll probably be underwhelmed.

On price, the ScanWatch sits in that awkward middle: not cheap, not crazy premium. Depending on deals, it often costs around what you’d pay for a mid-range Fitbit or a slightly older Apple Watch. For that money, you’re not getting a full app ecosystem or fancy smartwatch tricks. What you’re paying for is battery life, health features (ECG/SpO2), and a classic design that doesn’t scream gadget.

If you mainly want fitness features like advanced training metrics, built-in GPS, and detailed workout analysis, I’d say a Garmin or even a cheaper sports watch might give you more for the money. If you want a full smartwatch with apps, payments, music, and voice assistant, an Apple Watch or Galaxy Watch is a better fit, even if the battery life is worse. The ScanWatch is more for people who are okay sacrificing that stuff in exchange for long battery and more watch-like looks.

Where it feels like decent value is for anyone who genuinely cares about health monitoring: ECG for heart rhythm issues, SpO2 and breathing analysis for possible sleep apnea, plus solid heart rate and sleep tracking. Compared to devices that can do ECG and similar health checks, the price is actually on the lower side. Add the 2-year manufacturer warranty and the solid build (sapphire, steel), and it doesn’t feel overpriced, but it’s not a bargain either.

So for value, I’d call it pretty solid but not mind-blowing. If the feature mix matches what you actually use day to day—time, steps, HR, sleep, ECG sometimes, and you hate charging—then it feels like money well spent. If you’re chasing the most features-per-euro or want a big color screen and apps, you’ll probably feel like you could get more elsewhere for the same budget.

Design-wise, this is where the ScanWatch stands out. The 42 mm version I tried looks like a normal analog watch at first glance. Stainless steel case, black dial, physical hands, sapphire glass, and a small digital screen at 12 o’clock. There’s also a sub-dial at 6 o’clock that shows your step progress from 0 to 100%. On the wrist, it has more of a traditional watch vibe than any Fitbit or Apple Watch I’ve owned.

The hands are practical. You can read the time instantly in bright sunlight, no need to flick your wrist or tap the screen. There’s a bit of lume on the hands, just enough to see in low light. If the hands block the top screen when you trigger something (like checking heart rate or notifications), the watch automatically moves the hands out of the way and then puts them back. It’s a small detail, but it makes the hybrid concept actually usable.

The 42 mm case wears a bit larger than the number suggests because lug-to-lug is around 50 mm. On my medium wrist it’s fine, but if you have a small wrist, it will look big. In that case, the 38 mm version is probably a better call. The included black silicone strap is okay: soft enough, nothing fancy. The nice part is that it uses standard 20 mm quick-release lugs, so you can throw on leather, metal, or NATO straps easily and make it look more dressy or more sporty.

Downsides in design: the charger is fiddly. It’s a small cradle with two pogo pins that need to line up with the contacts on the back. If you bump the watch, it can lose contact and stop charging without you noticing. No wireless charging, no magnetic snap like Apple Watch or Garmin. Also, the PMOLED screen is small and monochrome. It’s fine for short texts and icons, but you’re not reading long messages or rich notifications here. Overall, though, if you care more about looking like you’re wearing a watch and not a gadget, this design hits the mark.

Battery is where the ScanWatch really stands out. With my usage (24/7 wear, notifications on, daily HR tracking, sleep tracking every night, a couple of ECGs and SpO2 readings most days, and 3–4 tracked workouts per week with connected GPS), I was averaging around 20–25 days on a single charge. That’s already miles better than the 1–2 days I got on my Galaxy Watch and about double what I got on some Fitbits.

If I backed off the manual ECG and SpO2 checks and didn’t track as many workouts, I could see it stretching closer to the advertised 30–35 days. One Amazon reviewer mentioned 17 days with 23% left while hammering ECG and O2; that matches my experience: the battery drain per day is low enough that you just stop worrying about it. I basically charged it once, then forgot about the charger for weeks, which felt strange after living with daily-charging watches for years.

The downside, as mentioned earlier, is the charging dock design. It’s a small plastic piece with two pogo pins. You place the watch on it, and it doesn’t strongly snap into place; if you nudge the table or the watch, it can misalign and stop charging. I had one morning where I thought it charged overnight but it hadn’t, because I’d bumped it when putting my phone down. The actual charging time is quick though: from around 10% to full took under an hour for me.

So, battery life is honestly the biggest selling point here. If you’re tired of babying your watch battery, this feels like going back to the old days where you barely think about charging. You do trade off some smartwatch features for that, but for me, not having to take it off every night or second night is worth the compromise.

In terms of comfort, I’ve worn the ScanWatch pretty much 24/7: work, sleep, workouts, shower. It weighs around 80 g with the strap, so heavier than a plastic Fitbit but lighter than most full-steel automatic watches. On my wrist, after a day or two I stopped noticing it. The silicone band is flexible and doesn’t dig into the skin, and the case back is smooth, so no weird pressure spots.

For sleep, I was a bit worried because I hate bulky watches in bed. It’s not as invisible as an ultra-thin tracker, but it was acceptable. The main thing is to adjust the strap: tight enough so the sensors stay in place, but not so tight that it leaves deep marks. When I wore it too loose, especially for SpO2 or ECG, I’d get inconclusive readings. Once I found the sweet spot (snug but not strangling), both comfort and accuracy were fine.

The watch sits slightly high on the wrist due to the sensors and case thickness (about 14 mm). Under a tight shirt cuff, you’ll feel it, but with normal shirts or T-shirts it’s not a problem. The lug shape doesn’t dig into the wrist bones, which is nice. And since it’s 20 mm strap width, you can swap in a softer fabric or leather strap if the stock silicone annoys you. I tried a nylon strap for a few days, and that made it feel even lighter.

One thing to note: for accurate SpO2, the watch needs to be at least 1 cm above the wrist bone and worn fairly snug. That position is slightly higher than I usually wear a watch, so at first it felt odd. After a week I got used to it, but if you like wearing your watch very low and loose, you’ll either need to change that habit or accept that some health readings will fail. Overall, for 24/7 wear, I’d call comfort solid: not invisible, but easy enough to live with day and night.

In terms of durability, the ScanWatch feels more solid than most plastic fitness trackers. The stainless steel case and sapphire glass give it a more watch-like, long-term feel. I’ve knocked it against door frames, metal chair arms, and a few countertops already, and the glass is still scratch-free. That’s better than my old Fitbit Sense, which picked up fine scratches on the screen after a few months. The case itself has a few tiny scuffs if you look closely, but nothing obvious from normal distance.

Water resistance is rated to 50 m, and I’ve used it in the shower and for dishwashing without any problem. I don’t dive or swim much, but a couple of short pool sessions were fine; no fogging, no weird behavior. Officially it’s okay for swimming but not for deep diving, which is standard. The silicone strap handles water and sweat well and dries quickly, but if you plan to swim a lot, I’d probably stick with silicone or a proper waterproof strap rather than leather.

The button/crown has stayed clicky and responsive, and the back sensors still read fine. Bluetooth connection has been stable, and I haven’t seen any random reboots or firmware glitches so far. Withings also has a decent reputation from their scales and older watches; I’ve had one of their scales for years and it’s still going, so that gave me some confidence about long-term support and firmware updates.

My only small concern long term is the proprietary charger. Lose it or break it, and you’re stuck ordering another one from Withings. No wireless charging, no universal standard. But that’s the case with most wearables anyway. Overall, between the sapphire glass, steel case, and 50 m water resistance, I feel comfortable wearing this as an everyday watch without babying it. It feels built to last more than the average glossy plastic smartwatch.

On the performance side, I’ll split it into a few bits: steps, heart rate/ECG, sleep, and workouts. Steps first: outdoors, it’s roughly in line with my phone and my old Fitbit (within a few hundred steps on a 10k day). Indoors, it’s a bit stingy. Walking around the house, especially slow shuffling or short trips between rooms, sometimes doesn’t get counted as consistently as my Fitbit did. So at the end of the day, I often ended up with a slightly lower step count compared to what I’m used to. If you obsess over hitting 10,000 exactly or comparing step counts with friends on Fitbit, this might irritate you.

Heart rate during the day is sampled frequently but not every second like some sports watches. The graph in the app looks smooth enough, and spot checks on the watch matched my finger pulse checks and a cheap chest strap within a few beats. For resting HR and general trends, it’s good. For high-intensity interval training, it’s okay but not elite-level; there is a slight delay when HR spikes or drops quickly, which is normal for wrist optical sensors.

ECG and SpO2 are the more “serious” tools. ECG readings matched my doctor’s single-lead device pretty closely when I stayed still and followed the instructions. It’s not a full medical diagnosis, but for catching irregular rhythms or logging episodes, it’s useful. SpO2 was initially disappointing until I fixed the watch position and tightness; after that, it lined up with a fingertip pulse oximeter within 1–2 percentage points most of the time. If you rush the measurement or move, you’ll get inconclusive results, so you need a bit of patience.

Sleep tracking is decent but not perfect. It catches bedtime and wake-up time fairly accurately, but like many trackers, if you lie still in bed scrolling your phone or watching TV, it sometimes thinks you’re still asleep. The sleep score and breakdown into light/deep/REM are useful as a trend, but I wouldn’t overanalyse every night. The breathing disturbance and O2 drops at night are interesting, especially if you suspect sleep apnea; it flagged a couple of nights where I slept badly and snored more, which matched what my partner noticed. Overall, the performance is solid for health awareness, but if you want hardcore training metrics or ultra-precise step counting indoors, this isn’t top of the pile.

Functionally, the ScanWatch is pretty focused. You get: steps, floors climbed, distance, continuous heart rate, ECG on demand, SpO2 (blood oxygen) on demand, sleep tracking with breathing disturbance detection, and basic workout tracking with GPS via your phone. That’s the core. No app store, no contactless payments, no music storage. It’s running a proprietary OS and everything funnels into the Withings Health Mate app or Google Fit if you link it.

The ECG and SpO2 are the headline features. ECG takes 30 seconds: you start it from the crown, put your other hand on the bezel, keep still, and it records a single-lead ECG. The app then classifies it (sinus rhythm, possible AFib, or inconclusive). I compared it to a medical finger ECG device from a relative; readings were in the same ballpark, though the ScanWatch is a bit noisier if you move. SpO2 also works, but it’s picky: the watch needs to sit about 1 cm above the wrist bone and fairly snug, and your hand should rest flat. Once I adjusted that, readings matched a cheap fingertip oximeter quite well.

For activity tracking, you can start a workout by long-pressing the button and choosing a sport (I mainly used walking, cycling, and runs). There’s no built-in GPS; it piggybacks on your phone, so you must have your phone on you for mapped routes and pace. Heart rate during workouts looked reasonable compared to a chest strap, maybe a few beats off sometimes but nothing crazy. It syncs to Strava, which is handy if you already live there.

What it doesn’t do: no advanced training metrics, no VO2max estimates, no coaching plans. Sleep tracking is there, but not as detailed as some Fitbits or Garmin. You get sleep stages, a sleep score, and info on breathing disturbances and oxygen drops. It’s decent, but if deep sleep graphs and advanced recovery metrics are your obsession, you might find the app a bit basic. So yeah, it’s a health monitor first, fitness watch second, and smartwatch third.