Withings ScanWatch 2
Rating applies to: Consumer single-lead ECG and irregular-rhythm notifications. It is not a rating or endorsement of Withings ScanWatch 2 as a company or of its quality, safety or results.
According to the company, a hybrid analog smartwatch with an FDA-cleared single-lead ECG app for atrial fibrillation detection, overnight heart rate variability, blood oxygen readings, temperature-variation tracking, sleep tracking and up to 35 days of battery. An optional Withings+ subscription adds features such as cardiologist ECG review.
Descriptions are based on publicly available information and are not independently verified. Features, pricing and availability change; confirm with the provider.
About this evidence rating
A large smartwatch study (Apple Heart Study) and a study of a single-lead ECG device versus electrophysiology study provide published data on detecting atrial fibrillation or arrhythmias. The studies address rhythm detection, not heart attacks.
This is an editorial opinion based on publicly available research, not medical advice or a regulatory determination. How ratings work. Last reviewed October 16, 2026.
Things to consider
- A notification or recording is not a diagnosis; confirmation by a clinician is needed.
- These devices cannot detect a heart attack. Seek emergency care for symptoms.
- Regulatory clearance and available features vary by country and model; check the manufacturer.
- Pricing
- Pricing varies; check the provider's site
- Regions (as reported; verify)
- US, CA, UK, EU
Sources
- Perez MV et al. Large-Scale Assessment of a Smartwatch to Identify Atrial Fibrillation. N Engl J Med 2019
- Turnbull S et al. Accuracy of a Single-Lead ECG Device for Diagnosis of Cardiac Arrhythmias Compared Against Cardiac Electrophysiology Study. Heart Lung Circ 2024
Links are provided for reference. Citing a study does not imply its authors endorse this site or any product.
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Longevity Ledger provides general information, not medical advice. Ratings are editorial opinions based on publicly available information. Consult a licensed clinician before changing medication, hormones, supplements, testing or training. Some links are affiliate or sponsored links; see our affiliate disclosure.