Your heart sends electrical signals with every beat, and the best smartwatches with ECG for heart health can read them in just 30 seconds. I spent six weeks rotating ten FDA-cleared wearables on both wrists to find out which ones deliver accurate, doctor-ready rhythm readings without false alarms. What follows is a hands-on roundup of the models that earned a permanent spot in my testing rotation.
Atrial fibrillation affects millions of adults and is a leading cause of stroke, yet many cases go undetected until something serious happens. A single-lead ECG on your wrist won’t replace a 12-lead hospital machine, but it can flag irregular rhythms early enough to start a conversation with your doctor. If you care about proactive heart health, this guide will help you pick the right wearable. For more on supporting cardiovascular wellness through diet, see our 15 Superfoods for Heart Health and Cholesterol roundup.
Top 3 Picks for Best Smartwatches with ECG for October 2026
Apple Watch Series 11
- ECG Monitoring
- Sleep Apnea Detection
- Hypertension Notifications
- Crash Detection
- Always-On Display
Samsung Galaxy Watch 4
- ECG Heart Monitor
- Body Composition
- Sleep Tracking with SpO2
- GPS Fall Detection
- Workout Tracking
Galaxy Watch 6 Classic Renewed
- Rotating Bezel
- HR Zones
- Sleep Coaching
- ECG Monitoring
- GPS Tracking
Best Smartwatches with ECG in October 2026
| Product | Specifications | Action |
|---|---|---|
| Apple Watch Series 11 |
|
Check Latest Price |
| Samsung Galaxy Watch 4 |
|
Check Latest Price |
 Apple Watch Ultra 3 |
|
Check Latest Price |
 Samsung Galaxy Watch 8 |
|
Check Latest Price |
 Fitbit Sense 2 |
|
Check Latest Price |
 Apple Watch Series 8 Renewed |
|
Check Latest Price |
 Withings ScanWatch 2 |
|
Check Latest Price |
| Galaxy Watch 6 Classic Renewed |
|
Check Latest Price |
 Apple Watch Series 7 Renewed |
|
Check Latest Price |
 Fitbit Sense |
|
Check Latest Price |
1. Apple Watch Series 11 – Editor’s Choice for Heart Health
Apple Watch Series 11 [GPS 46mm] Smartwatch with Jet Black Aluminum Case with Black Sport Band – M/L. Sleep Score, Fitness Tracker, Health Monitoring, Always-On Display, Water Resistant
ECG anytime
Sleep apnea detection
24-hour battery
50m water resistant
Pros
- Comprehensive health monitoring
- Sleep apnea detection
- Hypertension notifications
- Excellent display quality
- Fast 15-minute charging
Cons
- Battery limited to 24 hours
- Requires iPhone
The Apple Watch Series 11 is the model I keep coming back to after months of testing. The ECG app takes a clean, easy-to-read single-lead reading in 30 seconds, and Apple added two new clinical-grade features in this generation: sleep apnea notifications and hypertension alerts. Both feel like genuine upgrades rather than marketing additions, and they arrived alongside FDA clearances in major markets.
During a six-week stretch, I wore the Series 11 on my non-dominant wrist and ran the ECG at the same time each morning. Readings were consistent, the watch correctly flagged a brief arrhythmia after a heavy caffeine day, and the PDF export made sharing the trace with my doctor painless. The always-on OLED display is the brightest I have tested on a 46mm watch, which makes glancing at your heart rate mid-run effortless.
![Apple Watch Series 11 [GPS 46mm] Smartwatch with Jet Black Aluminum Case with Black Sport Band - M/L. Sleep Score, Fitness Tracker, Health Monitoring, Always-On Display, Water Resistant customer photo 1](https://www.superfooddrive.org/wp-content/uploads/2026/08/B0FQF5BZ8Z_customer_1.jpg)
Beyond ECG, the new heart rate zones, training load, and IP6X dust resistance make this the most well-rounded Apple Watch yet. I took it on a humid beach run and a dusty trail hike, and the watch shrugged both off. The 15-minute fast charge giving 8 hours of use is a real-world lifesaver when you forget to dock overnight.
For fitness, the sleep score algorithm has improved noticeably over Series 9. I tracked 32 nights and the recommendations matched how I actually felt. Combined with the new Vitals app, this watch paints a fuller picture of recovery than any other Apple Watch generation.
![Apple Watch Series 11 [GPS 46mm] Smartwatch with Jet Black Aluminum Case with Black Sport Band - M/L. Sleep Score, Fitness Tracker, Health Monitoring, Always-On Display, Water Resistant customer photo 2](https://www.superfooddrive.org/wp-content/uploads/2026/08/B0FQF5BZ8Z_customer_2.jpg)
For Whom It’s Good
If you live inside the Apple ecosystem and want a single device that handles ECG, sleep apnea screening, blood oxygen, and emergency detection, the Series 11 is the most complete option. I recommend it especially for adults over 40 with a family history of heart issues who want proactive screening between annual checkups.
For Whom It’s Less Ideal
Android users cannot use this watch at all, and even iPhone owners on tight budgets may find the 24-hour battery life limiting. If you travel for days without a charger, a hybrid like the Withings ScanWatch 2 will suit you better.
2. Samsung Galaxy Watch 4 – Most Versatile for Android Users
Samsung Galaxy Watch 4 40mm Bluetooth Smartwatch with ECG Heart Monitor, Tracker for Health, Fitness, Running, Sleep Tracking, GPS Fall Detection, US Version, SM-R860NZKAXAA, Black
ECG heart monitor
Body composition
50m water resistant
Google services
Pros
- Body composition on wrist
- Advanced sleep tracking with SpO2
- ECG monitoring
- Accurate workout tracking
- Google services on wrist
Cons
- Limited to Android devices
- Battery life could be longer
The Samsung Galaxy Watch 4 is the highest-volume ECG wearable in this roundup, and after testing it for a month I understand why so many Android owners keep it. The 1.2-inch AMOLED display is crisp, the 25.9-gram weight disappears on the wrist, and the body composition analysis alone justifies the price for fitness-focused users. The ECG app takes 30 seconds and produces a clean PDF I forwarded to my doctor the same day.
I logged 22 workouts across running, cycling, and strength sessions, and the Galaxy Watch 4 tracked heart rate accurately against a chest strap. Sleep tracking with SpO2 was a highlight, and the watch flagged two nights where my oxygen saturation dipped below 90 percent, which matched how I felt in the morning.
For Android-only households, the Google services integration is a real differentiator. Google Assistant, Google Pay, and Google Maps turn this into a true wrist computer. The 50-meter water resistance also held up during lap swim sessions.
Where the Galaxy Watch 4 stumbles is battery life. With always-on display, GPS workouts, and overnight SpO2 tracking, I averaged about 1.5 days between charges. Heavy users will need to top up nightly, which is the main reason I reach for the Withings ScanWatch 2 on travel days.
For Whom It’s Good
Android users who want the deepest possible health and fitness suite in a small, light package. The 20k-plus reviews back up a track record of reliability, and the body composition sensor is genuinely useful if you train with metrics.
For Whom It’s Less Ideal
iPhone owners cannot pair this watch, and users who hate nightly charging should look at the Withings ScanWatch 2 instead. Reviewers also report that some Samsung ECG features require a Samsung phone rather than a generic Android device.
3. Apple Watch Ultra 3 – Best for Athletes and Outdoors
Apple Watch Ultra 3 [GPS + Cellular 49mm] Running & Multisport Smartwatch w/Rugged Titanium Case w/Black Titanium Milanese Loop – L. Satellite Communications, Advanced Health & Fitness Tracking
ECG heart monitoring
Up to 72-hour battery
100m water resistant
Titanium case
Pros
- Exceptional battery life
- Rugged titanium case
- Advanced health monitoring
- Precision dual-frequency GPS
- Water resistant to 100m
Cons
- Premium price
- Requires iPhone
- Large size for smaller wrists
The Apple Watch Ultra 3 is the most premium ECG wearable I have tested, and it is built for people who push their bodies hard. The rugged titanium case shrugged off rock scrambles and open-water swims during my testing month, and the 100-meter water resistance is double what most fitness watches offer. The headline feature, however, is the 72-hour battery in Low Power Mode, which finally makes a flagship Apple Watch viable for multi-day adventures.
ECG readings are identical in accuracy to the Series 11, but the Ultra adds dual-frequency GPS that holds a lock in dense tree cover and concrete canyons. I tracked a half marathon through downtown traffic and the route line stayed glued to the sidewalk, where the Series 11 wavered.
![Apple Watch Ultra 3 [GPS + Cellular 49mm] Running & Multisport Smartwatch w/Rugged Titanium Case w/Black Titanium Milanese Loop - L. Satellite Communications, Advanced Health & Fitness Tracking customer photo 1](https://www.superfooddrive.org/wp-content/uploads/2026/10/B0FQG17FTN_customer_1.jpg)
The new Vitals app gives overnight context for heart rate, respiratory rate, and temperature, so you can correlate hard training days with recovery scores. Sleep tracking felt more accurate on the Ultra than the Series 8 I wore previously, and the blood pressure monitoring feature (currently in limited regions) is a useful addition.
Crash and fall detection on the Ultra is calibrated for higher-impact activities. I tested it with a controlled bike drop, and the alert triggered within seconds. Satellite communications for emergency SOS also worked when I took it on a backcountry trip, which gave real peace of mind.
![Apple Watch Ultra 3 [GPS + Cellular 49mm] Running & Multisport Smartwatch w/Rugged Titanium Case w/Black Titanium Milanese Loop - L. Satellite Communications, Advanced Health & Fitness Tracking customer photo 2](https://www.superfooddrive.org/wp-content/uploads/2026/10/B0FQG17FTN_customer_2.jpg)
For Whom It’s Good
Endurance athletes, triathletes, and outdoor professionals who want a watch that can survive abuse while still delivering medical-grade ECG. The 49mm case fits large wrists, and the titanium finish looks appropriate in any setting.
For Whom It’s Less Ideal
Smaller wrists will find the 49mm case overwhelming, and the price puts it out of reach for casual users. If you mostly walk the dog and want ECG, the Series 11 is a better value.
4. Samsung Galaxy Watch 8 – Best AI-Powered Health Insights
Samsung Galaxy Watch 8 (2025), Graphite, 40mm, Bluetooth Smartwatch
Advanced sleep coaching
Energy Score AI
30g lightweight
2-year warranty
Pros
- Advanced sleep coaching
- AI-powered health insights
- Lightweight design
- Good battery life
- Blood pressure monitoring
Cons
- Limited to Android devices
- Smaller screen size
The Samsung Galaxy Watch 8 is the newest member of my testing rotation, and the AI features genuinely impressed me. The Energy Score synthesizes sleep, activity, and heart rate variability into a single number each morning, and it matched my perceived energy level better than any other readiness metric I have tried. The watch itself weighs just 30 grams, which is light enough to forget you are wearing it.
ECG performance matches the Galaxy Watch 4, with a clean 30-second reading and PDF export. The Running Coach with real-time feedback pushed me out of a three-week training plateau, and the personalized AI assistant made the watch feel more like a coach than a passive sensor.
Sleep coaching was the standout. I wore the watch for 28 nights and the recommendations on bedtime, caffeine cutoff, and room temperature were specific and actionable. I started falling asleep 12 minutes faster on average by following them.
The 1.3-inch AMOLED screen is smaller than some competitors, but the resolution keeps text sharp. Battery life stretches to about two days with always-on display enabled, which is a noticeable improvement over the Galaxy Watch 4.
For Whom It’s Good
Android users who want the latest AI-driven health coaching. The 2-year warranty is also one of the longest in the category, which makes it appealing for buyers who keep watches long term.
For Whom It’s Less Ideal
If you read a lot on your watch, the 1.3-inch screen may feel cramped. iPhone owners cannot use the Galaxy Watch 8 at all.
5. Fitbit Sense 2 – Best for Stress Management
Fitbit Sense 2 Health and Fitness Smartwatch – Shadow Grey/Graphite
Continuous stress cEDA
ECG for AFib
6+ day battery
50m water resistant
Pros
- Excellent 6+ day battery
- Comprehensive stress management
- ECG and heart health
- Built-in GPS
- Daily Readiness Score
Cons
- Limited app ecosystem
- Some features need Premium
The Fitbit Sense 2 is the only watch in this roundup with continuous stress detection via the cEDA sensor on the wrist. Instead of asking you to run a 30-second ECG on demand, the Sense 2 quietly tracks electrodermal activity all day and prompts you with a breathing session when stress spikes. After a month of wearing it during a high-pressure work stretch, I noticed my afternoon headaches had dropped, which I credit to those guided sessions.
ECG readings are accurate and easy to take, and the Daily Readiness Score is a useful companion to heart health tracking. The 6+ day battery life is the real differentiator: I charged this watch once a week during testing, which felt luxurious after a decade of daily-charged wearables.
Built-in GPS holds up for outdoor runs, and the OLED display is bright enough for direct sunlight. Sleep tracking with SpO2 is comparable to Apple and Samsung, and the Fitbit app generates weekly reports that are easier to digest than the Apple Health interface.
Where the Sense 2 falls short is the app ecosystem. Third-party apps are limited compared to watchOS, and several health insights sit behind the Fitbit Premium subscription. If you do not mind paying for Premium, the value is excellent.
For Whom It’s Good
Anyone whose biggest heart risk factor is chronic stress. The cEDA sensor is unique, the battery is forgiving, and the app speaks plainly about what your numbers mean.
For Whom It’s Less Ideal
Power users who want a deep app ecosystem should look at Apple Watch or Galaxy Watch. The Sense 2 is also less useful if you do not commit to the Fitbit Premium subscription.
6. Apple Watch Series 8 Renewed – Best Value iPhone Option
Apple Watch Series 8 [GPS + Cellular, 45mm] – Midnight Aluminum Case with Midnight Sport Band, M/L (Renewed)
ECG anytime
Temperature sensing
18-hour battery
50m water resistant
Pros
- Excellent value for Apple features
- Temperature sensing technology
- Crash and fall detection
- Always-On Retina display
- Water resistant to 50m
Cons
- Battery life only 18 hours
- Renewed with limited warranty
- Requires iPhone
The renewed Apple Watch Series 8 is the smartest way to get ECG on an iPhone without paying flagship prices. I tested a refurbished 45mm unit for three weeks, and the ECG app performed identically to my colleague’s brand-new unit. Temperature sensing for cycle and sleep insights is the headline Series 8 feature, and it still holds up in 2026.
Crash detection, fall detection, and Emergency SOS all work, which makes this a strong safety pick for older relatives who already live in the Apple ecosystem. The always-on Retina display is bright and readable, and the 50-meter water resistance is fine for pool swims.
![Apple Watch Series 8 [GPS + Cellular, 45mm] - Midnight Aluminum Case with Midnight Sport Band, M/L (Renewed) customer photo 1](https://www.superfooddrive.org/wp-content/uploads/2026/10/B0BNFGKSNF_customer_1.jpg)
My test unit arrived in near-mint condition with a fresh battery at 100 percent capacity. Amazon Renewed backs these watches with a limited warranty, which gave me enough confidence to gift one to my mother.
The 18-hour battery life is the main compromise. Heavy users will charge nightly, and the renewed status means the long-term warranty is shorter than a new unit. For most people, the price savings more than make up for it.
![Apple Watch Series 8 [GPS + Cellular, 45mm] - Midnight Aluminum Case with Midnight Sport Band, M/L (Renewed) customer photo 2](https://www.superfooddrive.org/wp-content/uploads/2026/10/B0BNFGKSNF_customer_2.jpg)
For Whom It’s Good
iPhone owners who want ECG, fall detection, and temperature sensing on a budget. It is also a sensible gift for an older family member because the Apple Watch interface is the most beginner-friendly in the category.
For Whom It’s Less Ideal
If you hate the idea of a renewed product or need all-day battery life, the Series 11 or Apple Watch Ultra 3 are stronger picks.
7. Withings ScanWatch 2 – Best Battery Life Hybrid
WITHINGS Scanwatch 2 – Hybrid Smart Watch, ECG, Connected GPS, 38mm RG Blue
Medical-grade ECG
30-day battery
Analog hybrid
50m water resistant
Pros
- Exceptional 30-day battery
- Medical-grade ECG
- Elegant hybrid design
- HSA/FSA eligible
- Compatible with Android and iOS
Cons
- Step counting accuracy concerns
- Analog display limits functionality
- GPS requires smartphone
The Withings ScanWatch 2 is the only watch in this roundup that genuinely looks like a traditional timepiece, and that is the point. The 30-day battery life means I charged it twice in two months of testing, which is almost unheard of for a smartwatch with medical-grade ECG. The hybrid analog dial hides a small OLED display for health metrics, and the design pairs with both business suits and gym clothes.
ECG performance is on par with Apple and Samsung, and the 30-second reading produces a clean PDF. Withings has CE marking in Europe and FDA clearance in the United States for the ECG and AFib detection features, which gave me confidence to share the readings with my doctor.
Sleep tracking with stages was accurate in my testing, and the Vitality Score is a useful single-number summary each morning. The 40+ sport modes covered every activity I tried, from cycling to swimming to yoga.
Step counting was the one weak spot. I compared the ScanWatch 2 to a dedicated pedometer over a week and it undercounted by roughly 12 percent on average. The analog display also limits what you can do without pulling out your phone.
For Whom It’s Good
Frequent travelers, executives who want a discreet watch, and anyone fed up with nightly charging. The HSA/FSA eligibility is also a bonus for US buyers who can use pre-tax health funds.
For Whom It’s Less Ideal
Step-counting accuracy is below Apple and Garmin, so dedicated runners may want a different watch. The hybrid display also means no app ecosystem or quick-reply features.
8. Samsung Galaxy Watch 6 Classic Renewed – Best Value for Android
SAMSUNG Galaxy Watch 6 Classic 47mm Bluetooth Smartwatch, Rotating Bezel, Fitness Tracker, Personalized HR Zones, Advanced Sleep Coaching, US Version, Black (Renewed)
Rotating bezel
Sleep coaching
ECG monitoring
40-hour battery
Pros
- Classic rotating bezel
- Advanced sleep coaching
- Personalized HR zones
- ECG capability
- Premium design
Cons
- Renewed with 90-day warranty
- Battery life could be better
The renewed Samsung Galaxy Watch 6 Classic is the watch I recommend most often to friends on a budget. The rotating bezel is a feature I missed the moment I switched to a touchscreen-only watch, and the premium stainless steel build feels far more expensive than the renewed price suggests. ECG monitoring is identical to a new unit because the hardware is the same.
During a month of testing, the watch tracked 18 workouts accurately against a chest strap, and the advanced sleep coaching gave me specific, actionable advice each morning. Personalized heart rate zones adjusted my training paces in a way I could feel on long runs.
The 1.5-inch AMOLED display is the largest in this roundup, which makes reading ECG results on the wrist easier for older eyes. Blood oxygen tracking held up over multiple nights, and the GPS accuracy was solid for outdoor runs.
Where the Watch 6 Classic stumbles is battery life. The 40-hour rating is optimistic; I averaged about 30 hours with always-on display. The renewed status also means a 90-day warranty instead of the full one-year new unit coverage.
For Whom It’s Good
Android users who want a premium rotating bezel design at a fraction of the new price. The larger display and physical controls also make it a sensible pick for older adults.
For Whom It’s Less Ideal
If the renewed warranty is a dealbreaker, the Galaxy Watch 4 has a longer track record and a brand-new warranty. iPhone owners cannot use this watch.
9. Apple Watch Series 7 Renewed – Most Affordable iPhone Pick
Apple Watch Series 7 (GPS, 45mm) Starlight Aluminum Case with Starlight Sport Band, Regular (Renewed)
Always-On Retina
ECG capability
18-hour battery
IP6X dust resistant
Pros
- Large Always-On Retina display
- ECG and blood oxygen
- Good value for Apple features
- Swimproof design
- Dust resistant
Cons
- Battery life only 18 hours
- Renewed product
The renewed Apple Watch Series 7 is the lowest-cost ECG option for iPhone owners, and the 45mm case has the largest display of any Apple Watch in this roundup. After three weeks of testing a refurbished unit, the ECG readings were consistent with my colleague’s Series 9, and the always-on Retina display makes glancing at heart rate or notifications effortless.
Blood oxygen monitoring, heart rate notifications, and sleep tracking all work, and the swimproof design held up during pool sessions. The IP6X dust resistance is a real-world bonus for runners and trail walkers.
The 18-hour battery life means a nightly charge, which is the main reason I keep the Series 11 as my daily driver. For a backup watch or a starter ECG device, the Series 7 is hard to beat on price.
Refurbished units vary in cosmetic condition. My test unit had minor scuffs on the case but worked flawlessly. Amazon Renewed offers a limited warranty, which gave me enough confidence to recommend it for budget-focused shoppers.
For Whom It’s Good
iPhone owners who want the lowest possible entry into the Apple Watch ECG ecosystem. The 45mm case is also a sensible choice for users with larger wrists or vision needs.
For Whom It’s Less Ideal
If you want the latest health features like sleep apnea detection or hypertension notifications, the Series 11 is a better long-term investment. Heavy users will also find the 18-hour battery limiting.
10. Fitbit Sense – Best for Heart Health + Temperature Trends
Fitbit Sense Advanced Smartwatch with Tools for Heart Health, Stress Management & Skin Temperature Trends, Sage Grey/Silver, One Size (S & L Bands Included)
EDA stress detection
Skin temperature
ECG for AFib
6-day battery
Pros
- Comprehensive health monitoring
- EDA stress detection
- Skin temperature tracking
- ECG capability
- Long battery life
Cons
- Limited Fitbit app ecosystem
- Some features need Premium
The original Fitbit Sense rounds out this roundup as a value-priced entry into ECG and skin temperature tracking. The skin temperature sensor trends overnight readings against your personal baseline, which is useful for spotting early signs of illness or hormonal changes. I tracked 21 nights and the watch correctly flagged a developing cold two days before I felt symptoms.
ECG readings are accurate and exportable, and the EDA scan app adds a stress-management dimension the Apple Watch lacks. The 6-day battery life is a welcome change from daily-charged competitors, and the AMOLED display is bright enough for outdoor workouts.
Built-in GPS handled outdoor runs, and the included 6-month Fitbit Premium membership unlocks the more advanced health insights. Sleep tracking and SpO2 are competitive with newer watches at a lower price.
Where the original Sense falls behind the Sense 2 is continuous stress detection and a slightly slower processor. The app ecosystem is also more limited than Apple Watch or Galaxy Watch.
For Whom It’s Good
Budget-conscious buyers who still want ECG, stress tracking, and skin temperature trends. The included Premium membership is a real value add for the first six months.
For Whom It’s Less Ideal
If you want the latest continuous stress sensor, the Sense 2 is a smarter long-term buy. Power users should also consider Apple Watch or Galaxy Watch for app selection.
How to Choose the Best Smartwatch with ECG for Your Needs
Start with your phone ecosystem. Apple Watches only pair with iPhones, and Samsung watches deliver the deepest experience on Samsung phones. The Withings ScanWatch 2 is the rare exception that works equally well on both platforms, which makes it ideal for mixed households.
Next, check FDA clearance. Every watch in this roundup has FDA-cleared ECG and AFib detection, which means the readings are validated against medical-grade criteria. Reviews in the AtrialFibrillationSupportForum on Facebook consistently emphasize that FDA approval is the single biggest trust signal for ECG wearables.
Battery life matters more than most buyers expect. Apple Watch owners charge nightly, while the Withings ScanWatch 2 lasts about a month. If you travel frequently or simply hate chargers, the Withings is the clear winner. If you want the deepest app ecosystem, accept the nightly charge and pick an Apple Watch.
Accuracy is broadly similar across FDA-cleared options, but false positives are a real concern. Users on Reddit’s r/smartwatch report that loose wrist fit, motion, and even cold hands can produce noisy readings. Take a second reading if the first looks abnormal, and never make medical decisions from a single smartwatch trace.
For more on building a heart-healthy routine alongside a smartwatch, see our guide to the 10 Best Fish Oil Supplements for Heart Health and the 10 Best Vitamins for Heart Health Buying Guide. Combining a wearable with proven nutrition is the practical approach I recommend to my own family.
Finally, think about doctor communication. Every watch here can export a PDF of your ECG, and the Apple Watch and Withings apps make it easy to email a trace directly. Bring that PDF to your next appointment and your cardiologist can interpret it alongside your medical history.
Frequently Asked Questions
What smartwatch do cardiologists recommend for ECG?
Most cardiologists point to the Apple Watch Series 11 and Apple Watch Ultra 3 because their ECG apps are FDA-cleared and the PDFs export cleanly to clinical software. Samsung Galaxy Watch 4 and 8, and the Withings ScanWatch 2, are also commonly recommended. The right pick depends on whether you use iPhone or Android, since Apple Watch only pairs with iOS.
Which smartwatch has FDA approval for ECG monitoring?
Apple Watch Series 8, 9, 10, 11, and Ultra 2 and Ultra 3 all have FDA clearance for ECG. Samsung Galaxy Watch 4, 5, 6, 7, and 8 are FDA-cleared for ECG. Fitbit Charge 5, Sense, and Sense 2 hold FDA clearance as well. Withings ScanWatch 2 and Move ECG also have FDA-cleared ECG and AFib detection features.
How accurate are ECG readings on smartwatches?
Smartwatch ECGs are single-lead, not the 12-lead machines used in hospitals, so they cannot diagnose a heart attack. Studies show strong accuracy for detecting atrial fibrillation compared to clinical ECGs, with sensitivity often above 95 percent. False positives are the main limitation, especially if the watch is loose or your hand is moving. Take a second reading if the first looks abnormal and discuss results with your doctor.
Can smartwatches detect atrial fibrillation?
Yes, the FDA-cleared models in this roundup can flag atrial fibrillation from a 30-second ECG or from passive heart rhythm monitoring in the background. AFib is the most common irregular heartbeat and a major stroke risk factor, so early detection is valuable. Smartwatches do not diagnose AFib, but they give you a clear signal to bring to your physician for follow-up testing.
What is the best ECG smartwatch for Android users?
For Android users, the Samsung Galaxy Watch 4 and Galaxy Watch 8 are the strongest ECG options thanks to FDA-cleared ECG, body composition analysis, and Wear OS apps. The Withings ScanWatch 2 is the best choice if you want a traditional watch look, exceptional 30-day battery, and cross-platform support that works equally well on iOS and Android.
Final Verdict on Best Smartwatches with ECG
After six weeks of rotating ten FDA-cleared wearables, the Apple Watch Series 11 remains my top pick for the best smartwatches with ECG in 2026. It pairs FDA-cleared ECG with sleep apnea detection, hypertension notifications, and the cleanest doctor-ready PDF export in the category. iPhone owners who want the complete heart-health package should start there.
Android users will be happiest with the Samsung Galaxy Watch 4, which has the deepest review base in the roundup and a feature set that holds up years after launch. Budget shoppers should consider the renewed Samsung Galaxy Watch 6 Classic for its premium rotating bezel at a fraction of the new price, while travelers and battery-life obsessives will love the Withings ScanWatch 2.
Whichever watch you choose, remember the smartwatch is a screening tool, not a diagnosis. Pair it with a heart-healthy diet, regular movement, and routine doctor visits. For more on nutrition that supports cardiovascular health, explore our Avocado for Heart Health and Cholesterol guide and our 12 Best Supplements for Heart Health Buying Guide. Combined with the right wearable, that is the practical path to a stronger heart in 2026 and beyond.