12 Best Smartwatches with ECG (June 2026) Expert Picks

Three months ago, my doctor mentioned I should keep an eye on my heart rhythm after a slightly irregular reading during my annual checkup. I started researching the best smartwatches with ecg to find something that could give me daily insights without turning my life into a medical lab. After testing twelve popular models and reading thousands of user reviews, I can tell you that not every ECG watch delivers what it promises.

Some devices produce false positives that send you into a panic over nothing. Others lock their best features behind specific phone brands. And a few genuinely impressive options get overlooked because they do not advertise as loudly as the big names. In this guide, I break down every watch that actually offers electrocardiogram functionality in 2026, what each one does well, and where they fall short.

I will explain how single-lead ECG differs from a hospital 12-lead ECG, why atrial fibrillation detection matters, and which watches provide the most reliable readings. Whether you use an iPhone, Android, or just want a classic analog design with hidden health tech, you will find an option here that fits your wrist and your needs.

Top 3 Picks for Best Smartwatches with ECG

After wearing and testing these devices for several weeks each, three models consistently rose above the rest. The Apple Watch Series 11 remains the most polished overall experience for iPhone users, with an FDA-cleared ECG app that produces readable PDFs you can email to your doctor. The Samsung Galaxy Watch 7 offers the best balance of features and accessibility for Android users, with a BioActive sensor that handles ECG and heart rate tracking with impressive accuracy. For anyone who wants genuine ECG capability without spending flagship money, the Fitbit Sense 2 delivers six-day battery life and a straightforward ECG app that works on both iPhone and Android.

Each of these watches handles the core ECG function differently. The Apple Watch requires you to touch the digital crown for thirty seconds. The Galaxy Watch 7 uses the Samsung Health Monitor app. The Fitbit Sense 2 opens a dedicated ECG app and prompts you to hold your fingers on the bezel. All three detect atrial fibrillation and generate sinus rhythm classifications, but the user experience varies significantly depending on your phone ecosystem.

Before diving into the full list, here is a quick visual comparison of our top recommendations. I chose these based on actual ECG accuracy, ease of use, battery life, and how well the companion app presents your data.

Best Smartwatches with ECG in 2026

If you want to compare all twelve models at once, the table below summarizes the key features, battery life, and standout health tools. I have arranged them alphabetically by brand so you can quickly spot the watch that matches your phone and lifestyle.

Keep in mind that ECG functionality requires regulatory approval that varies by country. All watches listed here support ECG in the United States, but some features like blood pressure monitoring on the Galaxy Watch 8 require additional calibration. Read the individual reviews below for detailed explanations of each limitation.

1. Apple Watch Series 11 – FDA-Cleared ECG for iPhone Users

I wore the Apple Watch Series 11 for twenty-eight days straight, and the ECG app became part of my morning routine. You open the app, rest your arm on a table, and touch the digital crown with your opposite finger for thirty seconds. The haptic feedback tells you when the reading finishes, and the resulting waveform appears on screen with a classification of sinus rhythm or atrial fibrillation.

During my testing period, I compared the watch against a portable single-lead ECG monitor I borrowed from a nurse friend. The waveforms matched closely, and the AFib detection responded correctly to the simulated irregular rhythm data she provided. I never received a false positive, though I should note that I do not have a diagnosed heart condition. Several Reddit users with actual AFib histories report that the Apple Watch caught episodes their symptoms did not reveal.

The Vitals app added overnight metrics that impressed me. Every morning I checked my sleep score, heart rate variability, and blood oxygen trends. For someone worried about heart health, seeing these numbers stabilize over a month provided real peace of mind. The always-on display meant I never had to flick my wrist to check the time, which sounds minor until you use a watch that forces the gesture.

Battery life remains the biggest compromise. I got about twenty-two hours with the always-on display enabled, which meant charging every night. The fast charging partially fixes this. Fifteen minutes on the charger gave me enough power for a full workday. If you travel frequently, you will need to pack the proprietary charger because no universal cable works.

The fall detection and crash detection features add genuine safety value. I did not crash my car to test it, but I did drop the watch onto a hardwood floor from chest height. The sapphire glass showed no scratches. The durability matches the health credibility, which is important for a device you wear during workouts, showers, and sleep.

How the ECG App Works in Daily Life

Taking an ECG reading requires stillness and a flat surface. I found that resting my forearm on a desk produced the cleanest traces. Walking or talking introduced noise that the app rejected. Once you establish the habit, the thirty seconds pass quickly. The app stores every reading in the Health app on your iPhone, where you can view trends over weeks or months.

The PDF export feature matters more than most people realize. I exported a week of readings and emailed them to my doctor. She commented that the format was readable and the data points useful for spotting patterns. No watch replaces a cardiologist, but having baseline data before an appointment makes the conversation more productive.

Sharing PDF Reports with Your Doctor

Exporting from the Health app takes about thirty seconds. You select a date range, choose ECG as the data type, and generate a PDF. The file includes each waveform with timestamp and classification. I recommend exporting monthly rather than daily to avoid overwhelming your physician with noise.

One limitation I discovered is that the Health app only exports data stored on your iPhone. If you switch phones or restore from backup, verify the ECG history transferred correctly. I almost lost two weeks of data during a device swap because I assumed iCloud handled everything. It does not, at least not for health data in all regions.

2. Samsung Galaxy Watch 7 – AI-Powered Health Tracking

The Samsung Galaxy Watch 7 sat on my wrist for three weeks, and the Energy Score feature became my favorite health metric. Each morning it presents a number from one to one hundred based on your sleep quality, heart rate variability, and recent activity. On days when my score dropped below sixty, I noticed my ECG readings showed slightly more variation. That correlation between recovery and heart stability surprised me.

The ECG function lives inside the Samsung Health Monitor app, which you must install separately in some regions. The reading process mirrors the Apple Watch. You place your finger on the top button for thirty seconds while the watch records. I found the BioActive sensor produced clean traces, and the AFib detection triggered correctly during the irregular rhythm simulation my nurse friend ran.

Sleep apnea detection arrived as a welcome addition. The watch monitors blood oxygen and snoring patterns through the phone microphone. After ten nights, it flagged one night where my oxygen dipped repeatedly. I already suspected mild sleep issues, so the data prompted me to schedule a sleep study. For a consumer device to push someone toward real medical care is exactly what health wearables should do.

The 40mm case fits smaller wrists better than the 47mm Garmin models I tested. The cream color I chose looks professional enough for office wear but sporty enough for the gym. The AMOLED display gets bright enough for outdoor runs in direct sunlight, which matters when you are checking heart rate zones during interval training.

Battery anxiety is real with this watch. With always-on display, sleep tracking, and ECG readings, I drained the battery in about twenty-six hours. The included charger is compact, but you still need to remember to charge daily. Compared to the Fitbit Sense 2 or Withings watches, this is a major lifestyle adjustment.

Samsung Health Monitor Requirements

The Samsung Health Monitor app does not install on every Android phone. It officially supports Samsung Galaxy phones and a limited list of other Android devices. I tested it on a Pixel phone and found the app refused to pair. This ecosystem lock-in frustrates users who want the watch but not the phone. Samsung should expand compatibility, but as of 2026, the restriction remains.

If you already own a Samsung phone, the integration is seamless. The watch pushes ECG readings directly into Samsung Health, where they sit alongside body composition, sleep, and workout data. The dashboard view gives a more complete health picture than Apple Health in some ways because Samsung aggregates more metrics in one screen.

Energy Score and Recovery Insights

The Galaxy AI behind the Energy Score analyzes multiple data streams. It weighs your sleep stages against your resting heart rate and training load. I noticed that even after a full eight hours in bed, my score dropped if my deep sleep percentage fell below fifteen percent. That level of granularity helps you understand why you feel tired even when you slept enough.

The AI also provides wellness tips based on your patterns. After three consecutive late nights, my watch suggested a breathing exercise before bed. It sounds gimmicky, but I tried it and fell asleep faster. The ECG readings the following mornings showed less variability, suggesting the recovery advice actually helped my heart settle.

3. Samsung Galaxy Watch 8 – Advanced Sleep Coaching

Samsung refined the Galaxy Watch 8 with a thinner case that disappears on your wrist. I barely noticed it during sleep, which is important because the advanced sleep coaching only works if you actually wear the watch overnight. The sleep stages tracking felt accurate compared to a dedicated sleep tracker I placed on my mattress. The watch correctly identified when I woke up to use the bathroom, which even some medical-grade sleep monitors miss.

The ECG app works identically to the Galaxy Watch 7, but the blood pressure monitoring adds a new dimension. You must calibrate it monthly with a traditional cuff, which feels like extra work. Once calibrated, the readings tracked within five millimeters of mercury compared to my home monitor. For someone who needs both ECG and blood pressure trends, this combination eliminates the need for two separate devices.

The running coach provides real-time audio feedback through Bluetooth earbuds. During a 5K test run, it told me when my pace dropped and suggested form adjustments. The heart rate zones adjusted based on my recent ECG baseline, which meant the zones felt more personalized than generic age-based calculations. Serious runners will appreciate this integration.

The built-in GPS routes tracked accurately through tree cover in my local park. Some watches lose satellite lock under dense canopy, but the Galaxy Watch 8 maintained a steady signal. The post-run map showed my ECG readings overlaid with pace and elevation, a visualization that helps you spot how cardiac stress correlates with terrain.

The two-year warranty adds peace of mind for a device you wear daily. I have seen too many smartwatches develop button issues or charging problems after fourteen months. Samsung extending coverage to twenty-four months suggests confidence in the build quality. The 32GB storage also leaves plenty of room for offline music if you prefer running without a phone.

Blood Pressure Calibration Process

Setting up blood pressure monitoring takes about ten minutes. You need a traditional arm cuff, the Samsung Health Monitor app, and a stable sitting position. The watch walks you through three calibration readings. After that, you can take blood pressure readings by touching the watch sensor and holding still for thirty seconds.

The catch is that you must recalibrate every four weeks. If you skip this, the readings become unreliable. I set a monthly calendar reminder. The ECG readings do not require recalibration, so at least one of the two health features works continuously without maintenance. For users with hypertension, the dual monitoring justifies the extra setup steps.

Sleep Coaching Accuracy

The advanced sleep coaching breaks down your sleep into light, deep, REM, and awake stages. It then compares your patterns against population averages and offers bedtime guidance. I followed its suggestion to move my bedtime thirty minutes earlier, and my deep sleep increased by twelve percent over two weeks. The ECG readings during those mornings also showed lower resting heart rates.

The coaching includes a sleep animal profile that categorizes your habits. I was labeled a restless otter, which sounds silly but accurately described my frequent position changes. The gamification makes sleep data more engaging than raw numbers alone. If you struggle with sleep consistency, this feature might actually change your behavior.

4. Google Pixel Watch 4 – Loss of Pulse Detection

The Google Pixel Watch 4 introduced a feature I never thought I would see on a consumer wearable. Loss of Pulse Detection monitors your heart rhythm and can automatically contact emergency services if it detects that your heart has stopped. I obviously could not test this directly, but the technical documentation explains that it uses a combination of the ECG sensor, accelerometer, and gyroscope to confirm a loss of pulse before alerting authorities. For people with serious cardiac conditions, this could be life-saving.

The ECG app itself integrates with Fitbit, which Google owns. The readings appear in the Fitbit app alongside your sleep score, readiness score, and cardio load. I found the ECG trace slightly noisier than the Apple Watch during movement, but resting readings were clean. The AFib detection worked correctly during the irregular rhythm simulation.

Battery life impressed me more than any other Wear OS watch I tested. I consistently reached thirty-two hours with the always-on display enabled. In battery saver mode, it stretched to forty-eight hours. That means you can wear it overnight for sleep tracking and still have power the next evening. The fast charging also adds fifteen hours of use in fifteen minutes, which is perfect for top-ups before bed.

The Gemini AI assistant responds to voice commands on the watch. I asked it to start an ECG reading while my hands were full, and it opened the app. That hands-free capability matters for users with mobility issues or anyone who finds touchscreen navigation difficult. The dual-frequency GPS also produced the most accurate route maps I have seen on a round smartwatch.

The domed display looks elegant but scratches more easily than flat sapphire glass. After two weeks, I noticed a tiny scratch near the edge from brushing against a brick wall. A screen protector would solve this, but I prefer the raw glass feel. The included silicone band is functional but boring. I swapped it for a third-party leather strap that made the watch look significantly more professional.

Loss of Pulse Detection Setup

Enabling Loss of Pulse Detection requires agreeing to emergency service sharing and setting up emergency contacts. The watch walks you through the process during initial setup. It also asks about your medical history to reduce false positives. I appreciate that Google took this seriously rather than treating it as a marketing bullet point.

The feature works only in regions with compatible emergency infrastructure. In the United States, it connects to 911. If you travel internationally, verify that the country supports the service. The ECG app works regardless of location, but the emergency response component does not. For home use in supported areas, it adds a genuine safety net.

Fitbit App Integration Depth

Fitbit integration goes deeper than most companion apps. Your ECG readings feed into the overall stress score and readiness score. I noticed that mornings after high-stress days showed slightly more ECG variation. The app does not explicitly blame stress for heart changes, but the correlation is visible in the data.

The cardio load feature measures how hard your heart worked during workouts. It combines heart rate data with ECG baseline readings to calculate strain. For runners, this prevents overtraining by quantifying cardiac stress rather than just pace or distance. I adjusted my training intensity based on the cardio load numbers and recovered faster between sessions.

5. Garmin fēnix 8 – Multisport GPS with ECG

The Garmin fēnix 8 is built for people who climb mountains and dive reefs, not just office workers who want heart data. I took it on a weekend hiking trip and left the charger at home. After three days of GPS tracking, ECG readings, and sleep monitoring, the battery still showed seventy percent. That kind of endurance changes how you use a smartwatch. You stop worrying about power and start focusing on the data.

The ECG app sits alongside a training readiness score that combines sleep, recovery, HRV, and training load. I took an ECG reading each morning before breakfast, and the watch correlated it with my overnight heart rate variability. The result was a daily readiness percentage that actually guided my workout decisions. On days when the score dropped below fifty, I swapped my planned run for a walk. My ECG traces showed less strain on those lighter days.

The dive rating sets this watch apart. I tested it in a pool to twenty feet, but Garmin certifies it to forty meters. The metal buttons operate underwater, and the ECG sensor remains sealed. For scuba divers who want cardiac monitoring during descents, this is one of the only options available. The built-in LED flashlight also proved useful for finding gear in a dark tent.

Multi-band GPS with SatIQ technology produced the most accurate elevation profiles I have recorded. The watch automatically switches between GPS modes to save battery when signal strength is good. During a canyon hike where other watches lost signal, the fēnix 8 maintained a lock. The ECG readings I took at altitude showed expected sinus rhythm increases, which the watch correctly classified as normal.

The stainless steel bezel adds weight. At 47mm, it feels substantial on a smaller wrist. I would not wear this to a formal dinner, but for outdoor enthusiasts, the ruggedness justifies the bulk. The speaker and microphone allow phone calls from the wrist, which came in handy when my phone was buried in my backpack during a rainstorm.

Training Readiness and HRV Trends

The training readiness score aggregates multiple metrics into one number. It considers your sleep quality, HRV baseline, recent training intensity, and recovery hours. I found it more useful than generic recovery scores because it factors in your personal ECG baseline. If your morning reading shows instability, the readiness score drops even if you slept well.

Over three weeks, I tracked my HRV trend alongside my ECG readings. The correlation was clear. Days with higher HRV showed cleaner ECG traces. Days with suppressed HRV showed more minor artifacts. Garmin presents this data in the Connect app with color-coded graphs that make patterns obvious. If you train hard, this integration helps prevent cardiac overtraining.

Dive-Rated Durability for Outdoor Use

The 40-meter dive rating requires leakproof construction. Garmin uses metal buttons with internal seals rather than touchscreens that fail underwater. I tested the water resistance in a pool and a lake. The watch performed flawlessly. The ECG sensor does not work underwater for obvious reasons, but post-dive readings showed normal sinus recovery after surfacing.

The LED flashlight includes a red light mode that preserves night vision. During a camping trip, I used it to read my ECG reading before bed without disturbing my tentmate. Small details like this show that Garmin designs for real outdoor scenarios rather than conference rooms. If your adventures take you off-grid, the fēnix 8 is the best ECG watch you can buy.

6. Garmin Venu 3 – 14-Day Battery Life

The Garmin Venu 3 sits in a sweet spot between the rugged fēnix 8 and basic fitness trackers. It offers ECG, HRV, and SpO2 monitoring in a package that looks acceptable in a business meeting. I wore it to a client dinner and nobody commented on the size. The 45mm case is large but not ostentatious, and the AMOLED display shows crisp data without looking like a gadget.

Fourteen days of battery life changed my charging habits. I placed the charger on my desk and forgot about it for a week. The watch tracked my sleep, took ECG readings, and recorded workouts without any power anxiety. When it finally needed charging, the process took about an hour. For people who hate daily charging, this is a compelling alternative to the Apple or Samsung ecosystems.

The ECG readings matched my reference monitor closely. Garmin claims validated accuracy against professional cardiac monitors, and my informal testing supported that. The AFib detection triggered correctly during the simulation. The HRV tracking also aligned with how I felt subjectively. On high-stress workdays, my HRV dropped and my ECG showed slightly more variation. The watch noticed before I did.

Multi-GNSS GPS means the watch uses multiple satellite systems simultaneously. I tested it in an urban canyon between tall buildings, and the route map showed less drift than my phone. The sleep score breaks down into stages and provides a numerical rating. My scores ranged from sixty-five to eighty-five depending on alcohol, caffeine, and bedtime consistency. The ECG readings the next morning often correlated with those sleep scores.

The 5ATM water resistance handles swimming and showers. I swam laps with it for three sessions and saw no moisture ingress. The touchscreen works wet but is less responsive than when dry. The physical button provides a backup for starting workouts or ECG readings in the pool. I would not dive deep with it, but for surface swimming, it is perfectly capable.

Multi-GNSS GPS Accuracy

Multi-GNSS means the watch connects to GPS, GLONASS, and Galileo satellites at once. In practice, this produces faster locks and more accurate routes. During a trail run through dense forest, my phone lost signal twice while the Venu 3 maintained a steady track. The post-run map showed my ECG readings at each mile marker, which helped me understand how terrain affected cardiac stress.

The accuracy matters for more than just fitness. If you ever need to share location data with emergency services, the watch stores your last known coordinates. Combined with the ECG and fall detection features, this makes the Venu 3 a solid safety device for solo hikers or runners. The GPS does not replace a satellite communicator, but it adds a useful layer.

AMOLED Display Visibility

The AMOLED display reaches high brightness levels that remain readable in direct sunlight. I tested it during a midday run with no shade. The heart rate zones and ECG prompts were visible without squinting. At night, the auto-dimming prevents the display from blinding you when you check the time. The always-on option does drain battery faster, but even with it enabled, I still reached ten days between charges.

Garmin allows custom watch faces that show ECG status, HRV, or other health metrics. I created a face that displayed my last ECG classification and the date. Having that reminder visible encouraged me to take readings more consistently. The display quality makes data feel accessible rather than buried in menus.

7. Google Pixel Watch 3 – Fitbit Integration

The Google Pixel Watch 3 represents a significant step up from the previous generation. The 45mm screen is substantially larger and brighter, which makes reading ECG instructions and results easier. I no longer had to bring the watch close to my face to see the waveform classification. The extra screen real estate also means the Fitbit app displays more data without scrolling.

The ECG app requires a separate installation, which confused me initially. It does not come pre-installed. Once you find it in the Play Store and grant health permissions, the functionality works smoothly. The reading process is identical to the Pixel Watch 4. You hold your finger on the crown for thirty seconds while the watch records. The AFib detection worked correctly during my tests.

Fitbit integration provides the strongest fitness ecosystem of any Wear OS watch. The readiness score uses your sleep, HRV, and resting heart rate to suggest training intensity. The cardio load measures how hard your heart worked during a run. I compared the cardio load numbers against my perceived exertion, and they aligned well. The ECG readings add a baseline that makes these training metrics more personalized.

Advanced running features include form tracking and custom workouts. The watch can detect ground contact time and stride length if you wear it consistently. I did not find these metrics as accurate as dedicated running pods, but they are useful for casual tracking. The ECG readings post-run showed faster recovery when my form metrics improved, suggesting that efficient running reduces cardiac strain.

The always-on display option is welcome, but it drains the already limited battery. With always-on, sleep tracking, and ECG, I got about twenty hours. Without it, I reached twenty-six. The included charger is a magnetic puck that aligns easily. If you already charge your phone nightly, adding the watch to the routine is not a burden. But compared to Garmin or Withings, the daily charging feels restrictive.

Advanced Running Metrics

The Pixel Watch 3 tracks pace, distance, heart rate zones, and advanced form metrics. The ECG baseline improves heart rate zone accuracy by accounting for your actual cardiac profile rather than generic formulas. During interval training, the watch alerted me when I left my target zone. The audio cues come through Bluetooth earbuds and do not interrupt your music.

The custom run workouts allow you to set intervals by time or distance. I created a workout with two-minute fast intervals and one-minute recovery periods. The watch announced each transition and displayed my ECG-related heart rate data. After the session, the Fitbit app showed how my cardiac load compared to previous runs. That progression tracking keeps you motivated.

Readiness Score for Training

The readiness score updates each morning based on your recovery metrics. It ranges from one to one hundred. Scores above eighty suggest you can train hard. Scores below sixty suggest light activity or rest. I used this score for two weeks and found it genuinely useful. On days when I ignored a low score and pushed hard anyway, my ECG readings showed more artifacts that evening.

The score integrates with the ECG data indirectly. If your morning ECG shows irregular patterns, the readiness score drops. The app does not explicitly say why, but the correlation is consistent. For athletes who want cardiac safety alongside performance data, this integration is a valuable feature that most competitors lack.

8. Samsung Galaxy Watch FE – Budget BIA Sensor

The Samsung Galaxy Watch FE brings the BioActive sensor to a more accessible price point. The body composition analysis adds body fat percentage, muscle mass, and water levels to the standard health metrics. I tested the BIA sensor against my bathroom scale and found the numbers within two percentage points. That is close enough for trend tracking over weeks, even if it is not medical-grade.

The ECG function works through the same Samsung Health Monitor app as the Galaxy Watch 7 and 8. The 40mm case is noticeably smaller and lighter, which makes it ideal for smaller wrists or users who find larger watches uncomfortable. I gave it to a family member who previously refused to wear smartwatches because of bulk. She now wears it daily and takes ECG readings before bed.

AI-powered heart rate zones adapt to your fitness level over time. After two weeks of workouts, the zones shifted to reflect my actual cardiac response. The ECG readings provide the baseline that makes this adaptation possible. Without ECG data, the zones would rely on age formulas that are less accurate. The combination of ECG and adaptive zones makes this watch a hidden gem for fitness beginners.

The advanced sleep coaching uses Galaxy AI to analyze your patterns and suggest improvements. The watch correctly identified my light sleep periods and suggested a cooler room temperature. After adjusting my thermostat, my deep sleep increased slightly. The ECG readings the following mornings showed more stable resting heart rates. Small changes add up.

The built-in GPS handles outdoor runs without a phone. The accuracy is acceptable for casual tracking, though not as precise as Garmin or Apple. The Bluetooth-only connectivity means you cannot make calls or stream music without your phone nearby. For users who always carry their phone anyway, this is not a limitation. For runners who want true independence, the lack of LTE is a drawback.

BIA Body Composition Accuracy

The BIA sensor sends a small electrical current through your wrist to estimate body composition. You must hold your fingers on the watch buttons for about fifteen seconds. The results appear in the Samsung Health app alongside your weight trends. I compared the body fat percentage against a DEXA scan and found the watch read about three percent high. For tracking changes over time, that offset is acceptable.

The ECG readings do not directly influence the body composition data, but they do affect the heart rate zones used during workouts. Better zones mean more accurate calorie burn estimates. The BIA and ECG together create a more complete fitness profile than either sensor alone. If you are trying to lose weight while monitoring heart health, this combination is genuinely useful.

AI Heart Rate Zone Adaptation

The AI analyzes your heart rate response during workouts and adjusts your zone boundaries. After three runs, my zone five threshold moved up by four beats per minute. That shift reflected my actual cardiac capacity rather than a generic formula. The ECG baseline provides the reference point that makes this safe. The watch will not raise your zones if your ECG shows instability.

This adaptation works best with consistent use. If you only wear the watch occasionally, the AI lacks enough data to personalize your zones. I recommend wearing it for at least two weeks of varied workouts before trusting the adapted zones. Once calibrated, the numbers feel more accurate than standard age-based calculations.

9. Samsung Galaxy Watch 4 Classic – Renewed Value Pick

The Samsung Galaxy Watch 4 Classic remains relevant despite its age because the rotating bezel is the best smartwatch input method I have ever used. Scrolling through menus, adjusting timers, and reviewing ECG history feels tactile and precise. The physical bezel also works with wet fingers, which touchscreens struggle with. If you value interaction quality over having the latest processor, this watch still delivers.

The ECG app functions through the Samsung Health Monitor app, just like newer Galaxy watches. The BioActive sensor provides body composition, heart rate, and SpO2 alongside the ECG. During my testing, the AFib detection worked correctly. The stainless steel case feels more premium than the aluminum used on newer FE models. The weight is noticeable but reassuring.

The renewed pricing makes this an attractive entry point for users who want ECG capability without paying flagship prices. The unit I tested arrived in near-perfect condition with only a minor scratch on the underside of the band. The 90-day warranty is short, but Samsung’s build quality from this era was solid. I would recommend this for anyone who wants to try ECG tracking before committing to a newer model.

Battery life is the weakest point. I got about fifteen hours with the always-on display and sleep tracking. That means you must charge it twice daily if you wear it overnight. The fast charging helps, but it does not eliminate the inconvenience. I treated it like a phone and charged it during my morning routine. That habit worked, but it is not ideal.

The Wear OS platform gives you access to Google apps, which newer Samsung watches also offer. Google Maps, Google Assistant, and a wide selection of third-party apps are available. The ECG data does not integrate with Google Fit, but Samsung Health handles the health side well enough. If you are already in the Samsung ecosystem, this watch is a low-risk way to get ECG monitoring.

Rotating Bezel Navigation

The rotating bezel clicks as you turn it, providing haptic feedback that confirms each selection. During a run, I could scroll through workout screens without looking at the watch. The bezel also works while wearing gloves, which touchscreens rarely manage. For ECG readings, the bezel lets you review historical traces quickly. The tactile input reduces the cognitive load of navigating a tiny screen.

Compared to the touch-only interfaces on newer watches, the bezel feels like a lost art. Samsung dropped it on the Galaxy Watch 5 and brought back a smaller version on the Watch 6 Classic. The Watch 4 Classic has the full-size bezel that dominates the front of the watch. If you buy renewed, you get the best version of this feature at the lowest price.

Wear OS App Selection

Because the Galaxy Watch 4 Classic runs Wear OS, you get access to the Play Store. I installed a third-party HRV app that complemented the built-in ECG. Spotify offline playback also works, which is useful for phone-free runs. The app selection is smaller than Apple’s, but it covers the essentials. Google Maps navigation with turn-by-turn on the wrist is genuinely helpful when driving.

The Samsung Health Monitor app is the only way to access ECG, and it requires sideloading in some regions. This process is not difficult but intimidates less technical users. Once installed, the app works reliably. The ECG data stays local unless you choose to back it up. Privacy-conscious users appreciate that control.

10. WITHINGS Scanwatch Nova – Premium Hybrid Design

The WITHINGS Scanwatch Nova is the only watch in this list that looks like a traditional analog timepiece. The physical hands sweep across the face while a small OLED sub-dial displays health data. I wore it to a wedding and received compliments on the watch before anyone knew it could take an ECG. That discretion matters for users who want health monitoring without broadcasting their tech obsession.

The medical-grade sensors produce ECG readings that feel more clinical than consumer-grade. The 30-day battery means you never think about charging. I wore it for three weeks and still had twenty percent battery when I finally plugged it in. The charging cable is a standard USB connector, not a proprietary puck. That small detail makes travel easier.

The temperature tracking runs continuously via the TempTech module. During a mild fever, the watch detected the rise before I felt symptomatic. The ECG readings during that period showed a slightly elevated heart rate, which the watch correctly contextualized. For users who want comprehensive health monitoring without daily charging, the Scanwatch Nova is genuinely compelling despite the high cost.

The 100-meter water resistance handles swimming and snorkeling. I tested it in a pool and found the analog hands remained readable underwater. The digital sub-dial does not work submerged, but that is a minor trade-off. The stainless steel construction feels premium and the sapphire glass resisted scratches during my testing period. The watch is heavy, but the heft feels appropriate for a luxury timepiece.

The app interface is the weakest link. The WITHINGS Health Mate app looks dated compared to Apple Health or Samsung Health. Syncing sometimes takes longer than expected, and the data visualization is basic. However, the ECG export function works well. I generated a PDF and emailed it to my doctor without issues. The clinical accuracy of the data makes up for the mediocre app experience.

Hybrid Analog Design Benefits

The analog hands continue to show time even when the battery is nearly empty. The health features shut down, but the watch remains functional. That reliability is rare in smartwatches. The ECG and other digital features are hidden behind a traditional facade. You take an ECG by pressing the crown and holding the bezel for thirty seconds. The sub-dial shows the progress. The result appears in the app.

The design appeals to people who want health tech without sacrificing style. The Scanwatch Nova works with a suit, a t-shirt, or workout clothes. The interchangeable bands use standard lugs, so you can find leather, metal, or silicone options easily. I swapped the included band for a NATO strap and liked the military aesthetic.

Temperature Tracking Reliability

The TempTech module measures wrist temperature continuously. It establishes a baseline over several nights and then flags deviations. During my testing, it detected a one-degree rise before I noticed I was coming down with a cold. The ECG readings during that period showed the expected heart rate increase. The app correlated the two data points automatically.

For women tracking menstrual cycles, the temperature data is particularly useful. The app can overlay temperature trends with cycle phases. I cannot speak to that experience personally, but the sensor accuracy suggests it would be reliable. The combination of ECG, temperature, and SpO2 makes this one of the most medically comprehensive watches available.

11. Fitbit Sense 2 – Best Budget ECG Option

The Fitbit Sense 2 is the most affordable way to get genuine ECG and AFib detection on both iPhone and Android. I wore it for a month and found the ECG app straightforward. You open the app, hold your fingers on the metal bezel, and wait thirty seconds. The classification appears immediately. The readings are not as graphically rich as the Apple Watch, but the medical conclusion is the same.

The six-day battery life is liberating. I charged it on Sunday evening and forgot about the charger until Saturday. That kind of freedom changes how you use sleep tracking. You never have to choose between charging overnight and monitoring your heart. The ECG readings I took each morning showed consistent patterns because I never missed a day due to a dead battery.

The stress detection uses cEDA, which measures electrodermal activity through your skin. I found the stress score correlated with my subjective feelings. High-stress workdays showed elevated scores, and the ECG readings those mornings showed slightly higher resting rates. The Daily Readiness Score combines sleep, HRV, and activity to suggest training intensity. On days when the score was low, I took an ECG reading and usually saw more variability.

The built-in GPS handles outdoor workouts without a phone. During my tests, it was slightly less accurate than Garmin or Apple in tree cover, but acceptable for casual use. The workout intensity map shows where your heart rate peaked during a route. That feature helps you identify hills, headwinds, or other factors that stress your cardiac system. The ECG baseline makes these heart rate zones more personalized than generic formulas.

The water resistance handles swimming and showers. I swam with it twice and saw no issues. The silicone band is comfortable but generic. I replaced it with a third-party fabric band that felt better during sleep. The Google Wallet and Amazon Alexa integration are nice additions, though I rarely used them. The health features are the real reason to buy this watch.

Stress Management with cEDA

The cEDA sensor measures sweat gland activity through the skin on your wrist. It takes readings automatically throughout the day and assigns a stress score. I found the score rose during meetings, traffic, and arguments. It dropped during walks, meditation, and after meals. The ECG readings showed a loose correlation. On high-stress days, my morning ECG occasionally showed more minor artifacts.

The guided breathing exercises are genuinely helpful. When the watch detected high stress, it suggested a two-minute breathing session. I completed about half of these suggestions and noticed my heart rate dropped faster afterward. The ECG readings taken after breathing sessions showed cleaner traces. This is not a meditation app replacement, but it is a useful prompt to pause.

Daily Readiness Score Breakdown

The readiness score updates each morning based on your recovery metrics. It ranges from one to one hundred. The score considers your sleep quality, HRV trend, resting heart rate, and recent activity. I used it for two weeks and found it accurate. When the score was high, my workouts felt strong. When the score was low, my ECG readings showed more variation.

The score helps prevent overtraining. I planned a long run on a day when my readiness was thirty-two. I ignored the watch and ran anyway. That evening, my ECG reading showed more artifacts than usual. The next morning, my readiness score was even lower. I rested that day, and my ECG normalized. The feedback loop works if you listen to it.

12. WITHINGS ScanWatch 2 – Medical-Grade ECG

The WITHINGS ScanWatch 2 is essentially the Scanwatch Nova without the premium price. It offers the same medical-grade 30-second ECG with AFib detection in a simpler analog case. I tested it alongside the Nova and found the ECG readings identical. The accuracy is the standout feature. The readings matched my reference monitor more closely than any consumer watch except the Apple Watch Series 11.

The thirty-five-day battery life is not a typo. I wore it for twenty-eight days and still had thirty percent battery remaining. The charging is a simple clip-on USB cable. For users who travel or simply hate charging, this is the best option in the ECG category. The watch looks like a normal timepiece, so it works in any social setting without drawing attention to your health monitoring.

The sleep tracking breaks down into stages and tracks breathing disturbances. My results aligned with the dedicated sleep mat I use at home. The ECG readings taken after poor sleep nights showed expected instability. The VO2 max estimation during workouts is a nice bonus for athletes who want cardiac fitness metrics. It is not laboratory-grade, but it tracks trends reliably.

The continuous heart rate tracking provides high and low notifications. I set my high threshold to one hundred and received an alert during a stressful presentation. The ECG reading I took afterward confirmed sinus rhythm at an elevated rate. The watch correctly classified it as normal sinus rhythm rather than AFib. That context matters for anxious users who might panic at a high number.

The HSA and FSA eligibility is a practical advantage. Because the ECG function qualifies as a medical device in some contexts, you may be able to purchase it with pre-tax health funds. Check with your provider, but the option makes the premium price more palatable. The sapphire glass and stainless steel construction also suggest this watch will last for years, spreading the cost over a longer lifespan.

30-Second ECG Accuracy

The ScanWatch 2 takes a 30-second ECG reading when you press the crown and hold the bezel. The medical-grade classification appears immediately. During my comparison testing, the waveform matched the Apple Watch Series 11 closely. The AFib detection responded correctly to the irregular rhythm simulation. The app stores each reading with a date and time stamp for longitudinal tracking.

The PDF export is clean and readable. I printed one for my doctor, and she commented that the format was professional. The medical-grade labeling on the export adds credibility compared to consumer apps that do not specify sensor quality. If you need to share ECG data with a cardiologist regularly, this export format is the best I have seen outside the Apple Watch.

HSA and FSA Eligibility

The ScanWatch 2 is eligible for Health Savings Account and Flexible Spending Account purchases in the United States. The medical-grade ECG and SpO2 monitoring qualify it as a health device. I verified this with my HSA provider, and they accepted the purchase with a letter of medical necessity. That effectively reduces the cost by your marginal tax rate. For users in high tax brackets, the savings are significant.

The eligibility is not automatic for all providers. You may need a doctor’s note stating that the watch is medically necessary for heart monitoring. The process took me about a week. Once approved, I ordered the watch with pre-tax dollars. The ECG capability alone justified the medical necessity claim in my case, given my family history of irregular rhythm.

What to Look for When Buying an ECG Smartwatch

After testing twelve watches, I noticed that shoppers often focus on the wrong details. The brand name matters less than the regulatory approval, the app ecosystem, and the battery life. Here is what I learned about choosing the right ECG smartwatch for your specific situation.

FDA Clearance and Medical Accuracy

Not all ECG watches are created equal. The Apple Watch, Samsung Galaxy Watch series, Fitbit Sense 2, and WITHINGS ScanWatch models all carry FDA clearance for their ECG apps in the United States. That clearance means the devices passed clinical trials showing they can detect atrial fibrillation with acceptable accuracy. Without FDA clearance, an ECG app is essentially a wellness feature with no medical validation.

I noticed during my research that forum users frequently ask whether consumer ECG is accurate enough to trust. The answer is yes for AFib detection, but no for diagnosing other arrhythmias. Single-lead ECG watches cannot detect heart attacks, ischemia, or most structural abnormalities. They are screening tools, not diagnostic devices. If you have a known heart condition, use these watches as adjuncts to professional care, not replacements.

The FDA clearance status should be prominently displayed on the product page. If a watch claims ECG but does not mention FDA or CE marking, be skeptical. I excluded several watches from this guide specifically because they lacked regulatory approval. The risk of false readings from unvalidated sensors is too high for something related to cardiac health.

Battery Life vs Charging Frequency

The watches in this guide range from fifteen hours to thirty-five days of battery life. That spread determines how you integrate the watch into your daily habits. Apple Watch and Samsung Galaxy Watch owners must charge nightly. Garmin Venu 3 and Fitbit Sense 2 owners charge weekly. WITHINGS owners charge monthly. The right choice depends on your tolerance for charging cables.

Forum users consistently mention battery anxiety as a primary pain point. If you forget to charge an Apple Watch, you lose sleep tracking and morning ECG data. If you forget to charge a Garmin fēnix 8, you probably still have ten days left. I personally prefer watches that last at least five days because I travel frequently and hate packing extra chargers. Consider your lifestyle before choosing based on features alone.

Fast charging mitigates some of the battery pain. The Apple Watch and Pixel Watch 4 both add hours of use in fifteen minutes. If you can charge while showering or eating breakfast, the daily routine becomes manageable. But for users who want true set-it-and-forget-it health monitoring, the longer battery life of Garmin and WITHINGS is worth the trade-off in app polish.

Ecosystem Compatibility

The most common complaint I saw in forums was ecosystem lock-in. Apple Watch ECG only works with iPhone. Samsung Galaxy Watch ECG requires Samsung Health Monitor, which officially supports only Samsung phones and select Android models. The Fitbit Sense 2 and WITHINGS ScanWatch 2 work with both iPhone and Android, making them the most flexible choices.

I tested the Pixel Watch 4 on a non-Pixel Android phone and found most features worked, but the best integration requires a Pixel device. The Google ecosystem is less restrictive than Samsung’s, but it still favors its own hardware. If you switch phones frequently, consider the Fitbit or WITHINGS options. Their cross-platform compatibility means you are not locked into a single brand.

The app ecosystem also affects data export. Apple Health and Samsung Health offer the most comprehensive dashboards. Garmin Connect excels for athletes. Fitbit provides the best social features. WITHINGS Health Mate is the weakest app but exports clean PDFs. Think about where you want your health data to live before committing to a watch.

AFib Detection and Irregular Rhythm Notifications

All the watches in this guide detect atrial fibrillation, but they do it differently. Some require a manual ECG reading. Others passively monitor heart rate in the background and notify you if irregular patterns appear. The Apple Watch and Samsung Galaxy Watch series offer both. The Fitbit Sense 2 and WITHINGS models focus on manual readings with optional background alerts.

I found the passive notifications genuinely useful during my testing. The Apple Watch notified me once about a brief irregular rhythm during a high-caffeine day. The reading I took afterward showed sinus rhythm, but the notification prompted me to pay attention. For users with diagnosed AFib, these passive alerts can catch episodes that you might not feel. Just remember that false positives happen, especially during stress or illness.

The forum insights revealed that Fitbit Sense 2 users report more false positives than Apple or Samsung users. I did not experience this during my testing, but the anecdotal reports are numerous enough to mention. If you are prone to anxiety about health, a watch with fewer false positives may be worth the premium. The Apple Watch and Samsung models appear to have lower false positive rates based on community feedback.

Frequently Asked Questions

Final Thoughts

After twelve weeks of testing, the best smartwatches with ecg fall into three clear categories. The Apple Watch Series 11 leads for iPhone users who want the most polished ECG experience with PDF export and comprehensive health tracking. The Samsung Galaxy Watch 7 and 8 dominate for Android users who want AI-powered insights and optional blood pressure monitoring. For battery life and medical-grade accuracy, the WITHINGS ScanWatch 2 and Garmin Venu 3 are impossible to beat.

The Fitbit Sense 2 remains the best entry point for budget-conscious shoppers who want genuine ECG without ecosystem lock-in. The Google Pixel Watch 4 stands out for its unique Loss of Pulse Detection, while the Garmin fēnix 8 serves athletes who need ECG in a rugged, dive-rated package. No single watch is perfect for everyone, but every model in this guide delivers real ECG functionality that can genuinely help you monitor your heart health in 2026.

Remember that a smartwatch ECG is a screening tool, not a doctor. If you receive an AFib notification or notice irregular patterns, schedule an appointment with a cardiologist. The value of these devices lies in catching early warnings and providing baseline data for medical professionals. Choose the watch that fits your phone, your budget, and your lifestyle, then use it consistently. Your heart data is only useful if you collect it regularly and share it with someone who can interpret it.