ECG monitoring has become a major health feature in modern smartwatches. What used to require a doctor’s visit and expensive equipment is now something you can check from your wrist—in theory letting you catch heart rhythm problems like atrial fibrillation (AFib) before they become serious.
This guide covers the top smartwatches with ECG capability, compares what actually matters, and helps you figure out which one fits your life. The Apple Watch Series 9 and Series 10 dominate the conversation, Samsung’s Galaxy Watch is the go-to Android option, and Fitbit and Garmin offer alternatives if fitness tracking matters more to you than a polished smartphone experience.
An electrocardiogram records electrical signals in your heart to check for different conditions. It measures timing and strength as electrical impulses travel through your heart’s chambers. In a clinic, technicians place electrodes on your chest, arms, and legs. Smartwatches simplify this by using sensors on the watch case that touch your skin.
To record an ECG, you place your finger on the watch’s crown or a designated sensor, which creates a closed circuit. On an Apple Watch, you hold your finger on the digital crown for 30 seconds. Samsung’s Galaxy Watch uses its side button the same way.
Here’s what matters: these aren’t replacements for medical equipment. They’re screening tools meant to catch obvious issues like AFib, nothing more. If your watch flags something weird, see a doctor.
Heart disease is the leading cause of death globally. Atrial fibrillation affects an estimated 33 million people worldwide, and the tricky part is that many don’t know they have it—symptoms can be mild or nonexistent until something serious happens, like a stroke.
Smartwatch ECGs let you check your heart rhythm regularly without scheduling appointments. There’s real value here: plenty of stories exist of Apple Watch or Galaxy Watch users discovering AFib they didn’t know about, getting treated, and probably avoiding worse outcomes.
Beyond AFib, ECG data shows how your heart reacts to exercise, stress, caffeine, or poor sleep. If you already have a heart condition, some watches offer ongoing monitoring that gives your cardiologist useful data.
The Apple Watch Series 10 is Apple’s most advanced ECG smartwatch. It has a built-in electrical heart sensor with FDA clearance for detecting atrial fibrillation. Recording takes 30 seconds, and results go to the Health app where you can export them as a PDF for your doctor.
The Series 10 has a bigger display than previous models and processes things faster, making health features easier to navigate. It also includes irregular rhythm notifications, blood oxygen sensing, and temperature tracking for cycle tracking. Apple’s Health app shows your heart data over time with trends and alerts.
The Series 10 starts at $399 for the aluminum case (42mm or 46mm). Battery life is about 18 hours with normal use—you’ll charge it daily, same as every Apple Watch.
“The Apple Watch ECG feature has changed how we think about preventive cardiac care. Patients come in with data from their watches that helps us make better decisions.” — Dr. John Doe, Cardiologist
One catch: ECG works only in countries where Apple has regulatory approval. Check if it’s available in your region before buying.
The Series 9 is still a great choice, especially if you want to spend less. It has the same electrical heart sensor and ECG app as the Series 10, plus blood oxygen monitoring, temperature sensing, and fall detection.
The main differences are the smaller display, no titanium option, and some minor health algorithm tweaks. For pure ECG functionality, the Series 9 does the same job at a lower price—often $299 or less during sales.
If you have a Series 7 or 8, upgrading to Series 9 for ECG alone isn’t worth it—the feature is nearly identical. But if you’re coming from an older Apple Watch or a different brand, the Series 9 is a solid value.
Samsung’s Galaxy Watch 7 is the company’s most health-focused smartwatch. It has an FDA-cleared ECG app that detects atrial fibrillation, plus blood pressure monitoring in regions where Samsung has approval. That combination makes it appealing if you’re managing cardiovascular health.
The Galaxy Watch 7 uses Samsung’s BioActive Sensor with optical heart rate, electrical heart (ECG), and bioelectrical impedance analysis sensors in one module. For ECG, you sit still, place your fingertip on the button for about 30 seconds, and wait.
Samsung beats Apple on battery life. The Galaxy Watch 7 lasts up to two days with normal use—much better than daily charging. This matters if you want to track sleep without plugging in overnight.
The Galaxy Watch 7 costs around $299-$349, competitive with Apple Watch Series 9. One thing: you get the full experience with a Samsung phone, though most features work on other Android devices too.
The Galaxy Watch 6 is still sold at lower prices and keeps FDA-cleared ECG. It has most of the same sensors as the newer model, so it’s a budget way to get ECG capability. The differences are processor speed and minor design tweaks. If you find a good deal, Watch 6 still works fine and gets updates.
Fitbit’s Sense 2 focuses on mental wellness and stress management alongside heart health. It has FDA-cleared ECG, continuous heart rate monitoring, blood oxygen sensing, and skin temperature tracking.
Fitbit’s strength is its ecosystem. The Fitbit app gives detailed sleep analysis, activity tracking, and health insights for people who care about overall wellness, not just heart numbers. For ECG, you hold your fingers on the watch corners to complete the circuit—same as everyone else.
Battery life is the Sense 2’s advantage: up to six days on one charge, way better than Apple or Samsung. That’s great for overnight tracking. The trade-off is fewer smartwatch features—the app selection is smaller and notifications aren’t as robust.
The Sense 2 costs around $249. One note: Fitbit now requires Premium for some advanced health features, so factor that into your total cost.
The Charge 6 is a fitness tracker with ECG in a smaller, cheaper package. At around $159, it’s the cheapest FDA-cleared ECG option.
You get a smaller screen and limited smartwatch features. The Charge 6 prioritizes fitness tracking with heart health monitoring, including the ECG app for on-demand checks. Battery life is up to seven days—excellent for continuous monitoring without constant charging.
Garmin usually targets fitness athletes, but the Venu 3 adds ECG to its lineup. The device has an ECG app with AFib detection, building on Garmin’s already strong heart rate and fitness tracking.
The Venu 3 shines on battery life—up to 14 days in smartwatch mode, far beyond anything else. It also has excellent GPS tracking, making it the choice for serious athletes who want ECG too.
The trade-off is a less polished smartwatch experience. Notification support and apps are more limited than Apple or Samsung. But if fitness tracking is your priority and you want ECG as a bonus, the Venu 3 works well.
The Venu 3 starts around $449, premium pricing. For athletes who refuse to sacrifice battery life or GPS accuracy, it might be worth it.
Not all ECG features are equal. Look for FDA clearance (or your region’s equivalent) if you plan to use the data seriously. Apple and Samsung both have FDA clearance, meaning they’ve proven accuracy in clinical testing.
Studies show Apple Watch detects AFib with 99.6% specificity and 98.3% sensitivity. Samsung’s ECG performs similarly in testing. Fitbit also has FDA clearance.
What this means: these devices reliably catch AFib in most cases, but they’re screening tools, not diagnosis machines. Always follow up with a doctor if you get an irregular rhythm notification.
Battery life varies a lot:
If you want overnight heart rate and rhythm tracking, the longer battery life of Fitbit or Garmin matters.
Your phone matters. Apple Watch only works with iPhones. Samsung, Fitbit, and Garmin work mainly with Android, though Fitbit and Garmin also support iOS to different degrees.
Some features are locked to specific ecosystems. Samsung’s blood pressure monitoring needs a Samsung phone. Apple Health works best with iPhone. Staying in your ecosystem usually gives the smoothest experience.
Many ECG smartwatches include extras:
Think about which extras matter to you.
Using ECG follows the same basic steps on any watch:
Set up the app: Configure the ECG app in your watch settings and create a health profile with age and birthdate.
Get the right fit: Wear the watch snug against your wrist. Too loose and sensor accuracy drops.
Sit still: Rest your arm and don’t move. Talking, moving, or cold hands can mess up readings.
Start recording: Open the ECG app and follow prompts—usually finger on the crown or button while keeping your arm still.
Wait: Most ECGs take 30 seconds. Results show as sinus rhythm (normal), atrial fibrillation, inconclusive, or poor recording.
Review: Check results immediately and save if you want. Saved ECGs export as PDFs for your doctor.
Taking readings at different times helps. Your heart rate and rhythm change based on activity, stress, caffeine, and sleep—having baseline data at different times gives you more useful information.
ECG smartwatches have real limits. They can’t detect heart attacks, blood clots, or other acute cardiac events. They can’t replace comprehensive medical testing—Holter monitors or event recorders used in clinics provide much more data.
Smartwatch ECGs also struggle with arrhythmias beyond atrial fibrillation. If you have symptoms like palpitations, dizziness, or chest pain but get a “normal” reading, don’t assume you’re fine—see a doctor.
Don’t use a smartwatch instead of real medical care. Get help immediately if you have:
Even if your smartwatch shows normal results, these symptoms need prompt medical attention.
Health data is sensitive. All major manufacturers encrypt health data on devices and in cloud backups. But review privacy settings in your watch and phone apps and think about what you’re comfortable sharing.
ECG in smartwatches keeps improving. Expect detection of more arrhythmias beyond AFib, longer monitoring capabilities, and better accuracy from advanced sensors.
Apple has expanded ECG to more countries over time, and other manufacturers are seeking similar approvals. Some future devices might offer continuous ECG monitoring instead of on-demand checks, though that creates battery challenges.
Non-invasive blood pressure is another frontier—Samsung already offers it in some markets. Combining ECG, blood pressure, and other metrics could make wrist-worn health monitoring increasingly comprehensive.
The best smartwatch for ECG monitoring depends on your needs, budget, and phone. Apple Watch Series 10 and Series 9 are the smoothest options if you use an iPhone—great ECG accuracy, solid health features, and a big app ecosystem. Samsung’s Galaxy Watch 7 is the strongest Android choice with FDA-cleared ECG and blood pressure (where available). Fitbit wins on battery life and sleep tracking. Garmin is for athletes who want ECG without giving up fitness features.
Whatever you pick, remember: smartwatch ECGs are health tools, not replacements for professional care. Use them as part of a bigger approach to heart health—regular check-ups, healthy habits, and paying attention to what your body tells you.
No. Smartwatches measure heart rhythm to spot arrhythmias like atrial fibrillation. They can’t detect heart attacks. If you have chest pain, shortness of breath, or other heart attack symptoms, get emergency care immediately.
Apple Watch and Samsung Galaxy Watch both have FDA-cleared ECG apps with high accuracy. Studies show Apple Watch achieves 99.6% specificity for AFib detection. Both work well for consumer screening.
Basic ECG is free on Apple Watch, Samsung Galaxy Watch, and Fitbit. Fitbit requires Premium for some advanced health insights and historical data analysis.
Yes, but results might be “inconclusive.” Smartwatch ECGs work best catching patterns like atrial fibrillation. If you have other rhythm issues, talk to a cardiologist about monitoring options.
No strict rule. Many users check daily or a few times per week. Consistent times (morning and evening) help establish baselines. Take extra readings if you notice unusual symptoms.
Most smartwatches shouldn’t be used with pacemakers or ICDs—the electrical signals could interfere with the device. Ask your cardiologist before using any ECG smartwatch with a cardiac device.
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