The Health Stack
This series has, so far, treated health features piece by piece — the sensors in Part 2, the service quality in Part 3, the owner reports in Part 4. This installment assembles them into one picture, because health monitoring is the reason a large share of buyers choose a smartwatch at all, and because the three platforms approach it in genuinely different ways. What follows is the Apple Watch Series 11, the Galaxy Watch 8, and the Garmin Venu 4 measured as health instruments.
| Health area | Apple Watch Series 11 | Galaxy Watch 8 | Garmin Venu 4 |
|---|---|---|---|
| Heart rhythm | ECG, irregular-rhythm & high/low-rate alerts | ECG, irregular-rhythm alerts | ECG (Elevate 5), abnormal-rate alerts |
| Blood pressure | Hypertension notification (FDA-cleared screening) | Estimate (not US FDA-cleared; cuff recalibration) | — |
| Sleep | Sleep Score, sleep apnea notification, Vitals app | Sleep Score, Bedtime Guidance, sleep apnea (FDA-authorised) | Sleep Coach, personalised sleep need |
| Recovery / energy | Vitals overnight trends | Energy Score, Vascular Load | Body Battery, HRV status, training readiness |
| Coaching | Fitness+ (subscription) | Running Coach (free) | Garmin Coach; AI insights via Connect+ |
| Women’s health | Retrospective ovulation estimate | Cycle tracking | Skin-temperature ovulation, period prediction |
| Hub app | Apple Health (iPhone) | Samsung Health | Garmin Connect / Connect+ |
A first principle, carried over from Part 2: the length of a health-feature list is not a measure of health value. One watch can offer a dozen metrics, most of them wellness estimates; another can offer fewer that are regulator-cleared. The table should be read with that distinction in mind.
Apple — Regulated, and Deliberately Plain
Apple’s health strategy is the most conservative of the three, and conservative here is a compliment. Its marquee features are the ones that have passed, or are passing, regulatory clearance: the ECG app, sleep apnea notifications, and now hypertension notifications, which analyse the way blood vessels respond to the heartbeat over rolling 30-day windows. The new Vitals app collects overnight heart rate, respiratory rate, wrist temperature and sleep duration, and flags when a night falls outside a personal norm. Sleep Score, also new, reduces a night to a single number built from duration, bedtime consistency and interruptions.
What Apple does not do is as telling as what it does. It ships no carotenoid index and no “vascular load” reading. The health data lives in the Apple Health app on the iPhone, which remains the most coherent hub of the three, and it can be exported and shared with a clinician in a structured form. Guided coaching is the one piece behind a paywall — Fitness+, at $9.99 a month. Apple’s proposition is a short set of features that a doctor will not dismiss.
Samsung — The Widest Net
The Galaxy Watch 8 offers the longest list by a clear margin, and the list is genuinely mixed. At the credible end sit the FDA-authorised sleep apnea detection and the ECG. In the middle sits Bedtime Guidance, which models circadian rhythm and accumulated sleep pressure from three days of data to recommend a sleep time — a thoughtful feature, well executed. Running Coach, which grades fitness from one to ten and builds a marathon-capable training plan at no charge, is the strongest free coaching tool in this comparison.
Then there is the marketing end. The blood-pressure feature, as Part 2 established, is not cleared by the US FDA and needs cuff recalibration every 28 days. The Antioxidant Index estimates skin carotenoids and is, by Samsung’s own admission, not medically validated. Vascular Load is plausible but not yet something a physician will act on. Samsung Health is free, and the breadth is real — but breadth is doing some marketing work here, and a buyer should know which features are evidence and which are ambience.
Garmin — Health as Readiness to Train
Garmin approaches health from the opposite direction. Where Apple frames it medically and Samsung frames it broadly, Garmin frames it as a single question: are you recovered enough to train today? Body Battery condenses stress, sleep and activity into an energy figure from 5 to 100. HRV status, training readiness and recovery time answer the same question from other angles. The Sleep Coach now reports sleep alignment and a personalised sleep need; the Morning Report opens the day with the night’s data, the forecast and a suggested workout. The Venu 4 also added an ECG app with its Elevate 5 sensor, and its women’s health tracking uses skin temperature to refine period prediction.
These metrics are the best supported by exercise physiology of any in this comparison. The qualification, established in Parts 3 and 4, is commercial rather than technical: the most advanced analytical layer — Garmin’s AI-driven insights — is what is moving behind the Connect+ subscription. Garmin’s health data is excellent; the open question is how much of the best of it will remain free.
The Bottom Line
As health instruments, the three watches are not so much ranked as aimed. The Apple Watch is the one to choose if the goal is a short list of metrics a clinician will take seriously. The Galaxy Watch 8 casts the widest net, and rewards a buyer who can tell its FDA-authorised features from its wellness ambience. The Garmin Venu 4 is the instrument for anyone who reads health as training readiness — provided they accept that its sharpest insights are drifting toward a subscription.
Which is the same shape the whole series has traced. The hardware sets what is possible, the OS and services decide what it is like to use, and the genuinely useful comparison is never the length of the feature list. It is the distinction between what has been proven and what is merely printed on the box.
원문 기준 / Note: health features as of May 2026. Smartwatch metrics support awareness; they are not a substitute for medical diagnosis.
Photo: Luke Chesser / Unsplash
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