Best Smartwatch With ECG in 2026: What Each One Can (and Cannot) Do

Ten years ago, an electrocardiogram meant a clinic visit and a tangle of sticky leads. Today a watch can record a single-lead ECG in 30 seconds while you sit on the couch. That is genuinely useful, but it is also where a lot of marketing gets sloppy. A smartwatch with ECG is a screening tool, not a heart doctor on your wrist, and the details change a lot from brand to brand.

This guide covers what the ECG feature does, which watches offer it, which phone you need, and how accurate the readings really are. Specs and prices come from manufacturer pages and published reviews, and they shift with sales and software updates, so confirm the feature for your exact model and country before you buy.

What an ECG Watch Actually Measures

A normal fitness watch uses a green light sensor (photoplethysmography, or PPG) to estimate your pulse from blood flow. An ECG watch adds electrodes. When you rest a finger on the crown or bezel, the watch closes a circuit and records the tiny electrical signals your heart produces with each beat. That is a single-lead ECG, which is far simpler than the 12-lead tracing a hospital uses.

The main thing it is built to catch is atrial fibrillation (AFib), an irregular rhythm that raises stroke risk and often has no symptoms. Most watches classify a recording as sinus rhythm, AFib or inconclusive. They do not diagnose a heart attack, and they cannot tell you everything a clinician would see on a full ECG.

Many watches also run a second, passive feature: irregular rhythm notifications. The watch checks your pulse in the background and alerts you if it spots a pattern that looks like AFib, then you take a proper ECG to follow up. Not every ECG watch has both, which is one of the first things to check.

Smartwatches With ECG Compared

Sources: Apple, Samsung, Google, Garmin and Withings support pages, plus AppleInsider, DC Rainmaker, Wareable and Best Buy Canada. Feature availability varies by country and software version.

How Accurate Is a Smartwatch ECG?

In controlled research, quite accurate. A 2025 meta-analysis in JACC: Advances pooled 26 studies covering 17,379 patients and found a sensitivity of 94.81% and a specificity of 96.12% for smartwatch AFib detection. Sensitivity means catching real AFib, specificity means correctly clearing normal rhythm. In the subgroups, Samsung came in at 96.59% sensitivity and Apple at 93.62%.

Real life is messier. A Cleveland Clinic study of 50 patients recovering from cardiac surgery, using an Apple Watch Series 4, found only 41% sensitivity (with 100% specificity), and 31% of recordings came back unreadable. Those patients are a tough population, but it shows why the numbers on a product page and the numbers on your wrist are not the same thing.

The takeaway is not that the feature is unreliable. It is that an inconclusive result is common enough that you should expect to retake readings now and then, and that a normal result does not rule out a problem if you have symptoms.

Best Smartwatch With ECG for Most People

Best for iPhone: Apple Watch

The Apple Watch has the most polished ECG experience. You hold a finger on the Digital Crown for 30 seconds, and the app logs the result and can export a PDF for your doctor. It also adds irregular rhythm notifications, and in 2025 Apple received FDA clearance for hypertension notifications, which arrived on Series 9, Series 10, Ultra 2 and newer models. That feature needs 30 days of data and does not measure blood pressure directly, so read our breakdown of smartwatch blood pressure monitoring before you count on it. The one trap: the SE line skips the ECG sensor, so do not buy the cheapest model by mistake.

Best for Samsung phones: Galaxy Watch 8

Samsung’s ECG runs through the Samsung Health Monitor app, and Best Buy Canada’s guide notes it is limited to Galaxy phones. Unofficial workarounds exist, but they are fragile and unsupported. If you already carry a Galaxy phone, the Galaxy Watch 8 is a strong, well-rounded choice. If you do not, look elsewhere.

Best for other Android phones: Pixel Watch 4

Google’s Pixel Watch 4 includes an ECG app that checks for AFib. The ecosystem is Android only, and it pairs well with Fitbit-style health tracking. One caution from my research: Google’s earlier FDA documentation for passive irregular rhythm notifications named the Pixel Watch 2 and 3, so confirm the exact feature list for the Pixel Watch 4 on Google’s support page.

Best for sports and outdoors: Garmin

Garmin’s ECG app was first cleared on the Venu 2 Plus in January 2023 and now covers watches such as the Venu 3, fenix 8, Epix Pro, Enduro 3 and Tactix models. It is an on-demand check, so you start it yourself rather than getting passive alerts. Availability also differs by country, and Garmin keeps its own compatibility list at garmin.com/ECG, which is worth checking before you buy.

Best battery life: Withings ScanWatch 2

The ScanWatch 2 hides its sensors inside a classic analog watch and has FDA-cleared ECG. Withings claims up to 30 to 35 days of battery, though a reviewer at Pickr saw closer to 16 to 20 days with ECG and notifications turned on. It costs roughly $350 to $370. In one independent comparison, its automated AFib results produced more inconclusive tracings than Apple or Samsung, so factor that in.

What to Do After an Irregular Rhythm Alert

An alert is a prompt to follow up, not a diagnosis. A calm, simple routine helps you give your doctor something useful to work with.

Before You Buy a Smartwatch With ECG

If you are shopping with heart health in mind, our guide to the best smartwatch for health monitoring covers what else each model tracks, and the best smartwatch for seniors list focuses on screens and features that are easy to use at any age.

Frequently Asked Questions

Can a smartwatch ECG detect a heart attack?

No. A single-lead watch ECG is designed to look for AFib. It cannot reliably spot a heart attack, so chest pain or shortness of breath always needs urgent medical care.

Do I need a subscription for ECG on a smartwatch?

Not for the ECG app on the major brands covered here. You pay for the watch, and the ECG feature is included. Some extra health reports on other platforms can cost extra.

Which Apple Watch models have ECG?

Apple Watch Series 4 and later have the ECG app. The SE models do not. Always check Apple’s current spec page for the exact model.

Is a smartwatch ECG as good as a hospital ECG?

No. It records one lead instead of twelve, and a clinician will usually confirm any finding with a clinical ECG or a longer monitor.

Can I use a Samsung Galaxy Watch ECG with an iPhone?

Samsung’s ECG feature depends on the Samsung Health Monitor app, which is limited to Samsung Galaxy phones, so an iPhone does not support it.

Final Verdict

This article is for general information and is not medical advice.

Featured image: Pexels.

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