If you want to take an ECG on demand, compare ECG-capable Apple Watch, Fitbit, Samsung Galaxy Watch, and Withings ScanWatch 2 devices. The right choice depends first on whether the ECG feature works with your exact watch, phone, and country. A watch ECG is a limited, single-channel recording—not a diagnosis—and it is different from a notification that may flag an irregular rhythm.
Which wearables can take an ECG on demand?
These product families have official materials describing a user-initiated ECG recording. Availability and compatible models vary, so verify the current requirements for your location and phone before buying.
| Wearable family | On-demand ECG | Compatibility and availability | Key qualification |
|---|---|---|---|
| Apple Watch | ECG app records a single-channel tracing similar to Lead I. | Apple lists support for Apple Watch Series 4 or later and all Apple Watch Ultra models. Check Apple’s current country and region list and the requirements for your model: ECG on Apple Watch and feature availability. | FDA documentation describes informational use, not a replacement for diagnosis or treatment; intended use described there is for people 22 and older, with cautions for people with other known arrhythmias. FDA Apple ECG App record. |
| Fitbit ECG App | The app creates and analyzes a single-channel ECG and can classify a classifiable waveform as AFib or sinus rhythm. | The FDA filing describes use with Fitbit wrist-wearable devices, but does not establish a complete current list of compatible models. Confirm that the specific Fitbit supports ECG before purchase. FDA Fitbit filing. | The filing describes informational OTC use, not a replacement for diagnosis or treatment; it is not intended for people under 22 and is not recommended for users with other known arrhythmias. The FDA database lists a 510(k) decision date of September 11, 2020. FDA device record. |
| Samsung Galaxy Watch | Users can start an ECG recording. The app can also provide an opportunistic irregular-heart-rhythm notification, a separate feature. | The FDA filing specifies a compatible Galaxy Watch and phone. Check the current Samsung requirements for the exact watch, phone, and country. FDA Samsung filing. | The cited FDA indication is for informational use in adults 22 and older, and excludes people with other known arrhythmias. The FDA database records a substantially-equivalent decision on August 2, 2024. FDA database record. |
| Withings ScanWatch 2 | Withings lists ECG with AFib detection among the watch’s features. | Withings says feature availability varies by region; check its current ScanWatch 2 region availability page. Its US FAQ says the watch was using its FDA-cleared OTC ECG App as of July 2025: US ECG FAQ. | The cited availability information is specific to ScanWatch 2; it does not establish that every Withings wearable offers the same ECG function. |
The table describes functions and qualifications established by the cited official materials, not a ranking by price, battery life, comfort, or overall smartwatch capability.
How to choose the right ECG wearable
- Start with your phone. Check whether the ECG app supports your phone’s brand and operating system. Samsung’s cited indication, for example, requires a compatible Galaxy Watch and phone.
- Check your country. A feature available in one market may not be available in another. Review the manufacturer’s current regional list, especially for Apple Watch and ScanWatch 2.
- Confirm the exact model. Do not assume that every watch in a brand’s lineup has ECG. Fitbit’s cited FDA filing does not name a complete current compatible-model list.
- Decide whether you want a spot recording, an alert, or both. A spot ECG is user-initiated; a passive irregular-rhythm notification is a separate feature and is not offered or designed the same way across products.
- Read the app’s intended-use limits. Age limits, supported result categories, and cautions about other known arrhythmias differ. Use the manufacturer and regulator materials for the particular app, not a brand-wide assumption.
What a watch ECG can—and cannot—tell you
A spot ECG is a limited recording
A wearable ECG records electrical activity through a single channel, similar to Lead I. Depending on the app and whether the tracing is classifiable, it may label a result as sinus rhythm or AFib. The recording is not equivalent to a full clinical ECG, and a result that does not show AFib does not prove that you do not have an arrhythmia.
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Apple Support reports that, in a clinical trial of approximately 600 subjects, the Apple Watch ECG app had 99.6% specificity for sinus-rhythm classification and 98.3% sensitivity for AF classification among classifiable results. These are study-context figures for classifiable recordings, not a guarantee about any individual’s result or every recording. Apple Support: ECG on Apple Watch.
An irregular-rhythm notification is not a continuous guarantee
A passive notification and an on-demand ECG are distinct. Samsung’s FDA filing describes its notification function as looking for suggestive episodes in opportunistically acquired pulse-rate data, then potentially prompting the user to record an ECG. It explicitly says the feature will not notify on every possible episode; no notification is not evidence that no disease is present. FDA Samsung filing.
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Use readings as information, not a diagnosis
FDA-reviewed indications describe these apps as informational aids and say they do not replace conventional diagnosis or treatment. The FDA also characterizes smartwatch cardiovascular notifications as tools that may surface possible issues, not devices intended to diagnose them. FDA: Post-market evaluation of smartwatch cardiovascular notifications.
If you have concerning symptoms or questions about a reading or alert, seek advice from a qualified healthcare professional. Do not use a reassuring watch result to rule out a condition or make clinical decisions on your own.
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