For most iPhone users, the best ECG smartwatch is Apple Watch Series 11 or Ultra 3; for Samsung-phone users, consider the Galaxy Watch8 series or Galaxy Watch Ultra. Withings ScanWatch 2 is a strong hybrid option, while Fitbit Sense 2, Charge 6, and Pixel Watch 4 offer ECG through Google Health in supported markets. ECG watches take user-initiated, single-lead recordings that can help capture a rhythm during symptoms, but they cannot diagnose or rule out heart disease.
Best ECG smartwatches at a glance
| Pick | Who it suits | Phone and app | Key point |
|---|---|---|---|
| Apple Watch Series 11 or Ultra 3 | iPhone users | iPhone XS or later; Apple Health | ECG works on Series 4 and later and all Ultra models; not Apple Watch SE. |
| Samsung Galaxy Watch8 series or Galaxy Watch Ultra | Samsung-phone users | Compatible Samsung phone running Android 12 or later; Samsung Health Monitor | ECG is not available on iPhone or non-Samsung Android phones. |
| Withings ScanWatch 2 | People who prefer a hybrid analog-style watch | iOS or Android; Withings app | On-demand ECG, PDF export, and long battery life; ECG availability varies by region. |
| Fitbit Sense 2 or Charge 6 | Google Health users who want a tracker or health-focused watch | Supported phone and region; Google Health | Current ECG setup and results use Google Health, not the old Fitbit-app workflow. |
| Google Pixel Watch 4 | Pixel and Android users | Android and Google Health in supported markets | Google ECG app support also includes Pixel Watch, 2, and 3. |
What a smartwatch ECG measures
An electrocardiogram (ECG) records the heart’s electrical activity. Optical heart-rate sensors use changes in blood flow to estimate pulse, so ECG is a different kind of measurement, not simply a more accurate pulse reading. Most consumer ECG watches record a single-lead tracing similar to Lead I; a clinical ECG typically uses 12 leads to view electrical activity from multiple angles.
A watch ECG can classify a recording as normal sinus rhythm, suggestive of atrial fibrillation (AFib), or inconclusive, depending on the device. It cannot rule out every rhythm problem or diagnose a heart attack, blocked arteries, or other heart conditions. A normal result only describes the recorded segment. The FDA describes smartwatch cardiovascular notifications as tools for possible abnormalities, not replacements for medical evaluation. (FDA; American Heart Association)
Choose by phone and ecosystem
Compatibility is a practical first filter: ECG features may depend on the phone, app, and country as well as the watch. Check that the feature is available in your region and that your phone meets the manufacturer’s requirements before buying.
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- For iPhone: Apple Watch ECG requires an iPhone XS or later, current compatible software, and regional availability. It is not available on Apple Watch SE. Recordings are saved in Apple Health.
- For Samsung phones: Samsung Health Monitor requires a compatible Samsung phone running Android 12 or later and availability in your country. Samsung’s ECG feature does not work with iPhones or non-Samsung Android phones.
- For Google Health: The Google ECG app supports Pixel Watch models 1 through 4 in listed markets. Fitbit Sense, Sense 2, Charge 5, and Charge 6 are also listed as compatible. ECG results are handled in Google Health; Pixel Watch needs LTE or Wi-Fi to sync ECG data.
- For iOS or Android with a hybrid watch: Withings ScanWatch 2 supports both platforms, but ECG availability and clinical validation vary by region. If ECG does not appear, check setup and regional availability.
Sources: Apple Support; Samsung Support; Google Health Help; Withings.
How to take a useful ECG reading
- Use the manufacturer’s setup instructions first; ECG may require installing or activating a companion app and accepting its instructions for use.
- Sit down, rest your forearms on a solid surface, and wear the watch snugly in the position its instructions specify.
- Open the ECG app and place your finger or fingers on the indicated contact points. Do not press a button unless the instructions tell you to; on Apple Watch, rest a finger on the Digital Crown without pressing it.
- Stay still and quiet until the recording ends. Follow the app’s instructions if it asks you to add symptoms or save the result.
- Review and export the recording in the relevant app if you want to discuss it with a healthcare professional.
Movement, poor contact, dry or wet skin, cold hands, sweat, and a loose fit can interfere with readings. Apple advises cleaning and drying the watch after swimming, showering, heavy perspiration, or handwashing; its ECG app is designed to operate between 32°F and 95°F (0°C and 35°C). Google says its ECG app cannot assess rhythm above 120 beats per minute. Samsung notes that high or low heart rate and other recording issues can produce an inconclusive result. Follow your device’s instructions rather than repeatedly trying to force a result. (Apple Support; Google Health Help; Samsung troubleshooting)
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What the results can—and cannot—tell you
A watch ECG is most useful as a recording to capture an intermittent symptom, such as palpitations, that you can share with a healthcare professional. It is a spot check, not continuous electrical monitoring: background irregular-rhythm notifications, where available, may use optical pulse data rather than a live ECG. A normal reading does not prove that your heart is healthy, and an inconclusive result does not itself diagnose a problem.
Do not use a watch result to self-diagnose or dismiss symptoms. Contact a healthcare professional about concerning symptoms or repeated unusual results. Seek emergency care for severe or urgent symptoms, regardless of what a watch says. For general background on ECG’s limits, see the FDA and the American Heart Association.
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Withings ScanWatch 2 and ScanWatch Nova
ScanWatch 2 is a hybrid analog-style watch with on-demand ECG and PDF sharing through the Withings app. Withings lists it from $369.95 and advertises up to 35 days of battery life. ScanWatch Nova offers a similar ECG-oriented approach with more premium construction; Withings lists it at $599.95 and also advertises up to 35 days. Prices and availability can change. Withings says ECG availability and clinical validation vary by region, so confirm support where you live. Its US product page says Nova irregular-rhythm notifications are not yet available. (Withings watches; Withings ECG watches; ScanWatch Nova)
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.FAQ
Can a smartwatch ECG detect atrial fibrillation?
Some supported ECG apps can classify a user-initiated recording as suggestive of AFib. That result is not a diagnosis, and a watch may not identify every rhythm problem. Discuss concerning or repeated results with a healthcare professional.
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Can a smartwatch ECG detect a heart attack?
No. A consumer watch’s single-lead ECG is not a heart-attack test and cannot rule out a heart attack. Do not delay urgent care because a watch reading appears normal.
Is smartwatch ECG continuous?
Usually not. ECG is generally a manual spot recording. Some watches offer background irregular-rhythm notifications based on optical pulse measurements, which are different from an ECG recording.
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Does Samsung Galaxy Watch ECG work with any Android phone?
No. Samsung’s current US support information requires a compatible Samsung phone running Android 12 or later; the feature is not available on iPhones or non-Samsung Android phones. Availability also depends on country or region.
Where do Fitbit ECG results appear now?
Google’s current instructions use the Google Health app for ECG setup and results, rather than the old Fitbit-app workflow. Check the compatibility and availability information for your device and region.
Why might a watch ECG say “Inconclusive”?
Movement, poor electrode contact, skin conditions, or a heart rate outside the app’s supported range can interfere with classification. Follow the device’s guidance, and ask a healthcare professional if you have symptoms or concerns.
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