Apple

Apple Watch

The most medically capable consumer wearable — FDA-cleared ECG and AFib detection, sleep-apnea notifications — wrapped in the device you'd wear anyway.

Year one: $399; one-off
Hardware: $399; From ~$249 (SE) / $399 (Series) / $799 (Ultra)
Subscription: None; not required
Battery: 18–36 hours (Ultra ~72)

No other consumer device carries as many cleared medical features: a single-lead ECG, irregular-rhythm notifications, fall and crash detection, and more recently sleep-apnea notifications. Battery life means overnight wear takes planning, and its sleep staging is weaker than a dedicated ring. But it is the hub of Apple Health, which makes it the single best on-ramp for getting everything else into one place — including Whatstack.

Is the measurement validated?

The ECG and AFib features are FDA-cleared and independently studied — genuinely clinical-grade for what they claim. Sleep staging is unremarkable. Blood-oxygen availability has varied by region and model because of patent litigation, so check before buying for that feature.

What it measures · 18

Heart rate
Resting heart rate
Walking heart-rate average
Heart-rate variability (HRV/SDNN)
Blood oxygen (SpO₂)
VO₂ max (cardio fitness)
Respiratory rate
Sleep duration
REM sleep
Deep sleep
Core / light sleep
Steps
Active energy burned
Exercise minutes
Stand hours
Wrist / skin temperature (sleeping)
Walking speed
Six-minute walk distance

Does it reach your record?

✓ Syncs

Native. Everything lands in Apple Health, which the Whatstack iOS app reads in full.

Explore your health record →

Best for

Anyone who wants one device for fitness, safety and cardiac screening — and the easiest path into a complete health record.

Watch out

Battery makes 24/7 wear a chore. If sleep is your main question, a ring beats it.

Manufacturer site

Price checked 2026-08-09 and quoted at MSRP — hardware pricing moves. Consumer devices estimate rather than diagnose; discuss anything clinical with your doctor.

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