9 Best ECG Smartwatch | Track AFib with These ECG Smartwatches

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The Withings ScanWatch Nova achieves something rare: it looks like a traditional Swiss timepiece while housing an FDA-cleared ECG sensor, continuous temperature monitoring via the TempTech24/7 module, and overnight SpO2 tracking. At 30 days of battery life in smartwatch mode, it demands far fewer charging interruptions than any AMOLED competitor, meaning your overnight rhythm and respiratory disturbance data flows without gaps. The stainless steel case and domed sapphire crystal give it a weight and polish that draws compliments, not stares.

The onboard ECG requires you to touch the crown for 30 seconds, generating a Lead-I waveform that syncs to the Withings app. Users report that the app allows PDF exports, which can be directly attached to a patient portal message. Sleep tracking is generally reliable, though several experienced reviewers noted that lying still while reading books can occasionally register as light sleep, skewing sleep onset times by an hour or so. Real-world battery averages closer to 20 days when daily temperature and SPO2 readings are active.

The lack of an always-on AMOLED display and the absence of onboard GPS for run mapping mean this watch prioritizes medical-grade health tracking over sports performance. For someone who wants a dress watch that passively tracks cardiac temperature and breathing disturbances, the Nova is unmatched. The hybrid approach — analog hands atop a digital health engine — delivers 90% of the health insight of a full smartwatch without the 1.5-inch screen glow.

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The Garmin Forerunner 970 marries a bright AMOLED touchscreen with physical button controls, a lightweight titanium bezel, and a sapphire lens — then adds an FDA-cleared ECG app that can record heart rhythm and flag signs of atrial fibrillation for users 22 and older. This is the first Forerunner to embed lead-I ECG directly into a triathlon-focused platform, giving serious endurance athletes a way to spot-check cardiac rhythm between swim-bike-run sessions without wearing a separate chest strap for diagnostics.

Battery life reaches 15 days in smartwatch mode and 26 hours in full GPS mode, which means you can run a 50-mile ultra without dropping ECG and HRV logging mid-race. The Training Readiness Score draws on sleep quality, recovery, and HRV status, while the running economy metrics — step speed loss, ground contact time, and wrist-based running power — help you adjust form in real time. The built-in LED flashlight adds low-light safety for early morning or late-night runs.

The steep learning curve of Garmin’s Connect IQ ecosystem is a known friction point. Some users find the initial setup overwhelming due to the sheer volume of data fields, zones, and glance widgets. But once configured, the 970 delivers the most comprehensive single-device window into cardiovascular and musculoskeletal load available. If your training revolves around structured intervals, race pace targets, and recovery windows, this watch becomes the hub of your performance management.

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The Apple Watch Ultra 3 pushes the boundary of what a mainstream wearable can do for cardiac vigilance. It features an FDA-cleared ECG app that works with the Digital Crown, irregular rhythm notifications, and passive nighttime monitoring for sleep apnea detection. The 49mm titanium case houses a 100-meter water resistance rating and a sapphire crystal display that survives mud runs, ocean swims, and granite countertops. With up to 42 hours of normal use (72 in Low Power Mode), it bridges the gap between daily Apple Watch charging and multi-day adventure endurance.

The addition of satellite communication for emergency SOS when out of cellular range makes this the strongest safety-oriented ECG smartwatch. You can record an ECG, then immediately text emergency services via satellite if the reading indicates rapid heart rhythm changes. The dual-frequency GPS keeps track accurate even in deep urban canyons or dense forest canopy. The customizable Action Button can be set to launch the ECG app with one press, reducing the steps between a palpitation and a saved waveform.

Battery life, while improved over the Series 10, still lands around 1.5 to 2.5 days with always-on display and regular GPS workouts. Users with large wrists may find the 49mm case size prominent during sleep, slightly impacting overnight HRV consistency. The titanium Milanese Loop band looks elegant but requires caution to avoid scratching the sapphire crystal during weightlifting — a silicone band is safer for gym sessions.

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The Garmin fēnix 8 in the 51mm size is a multisport powerhouse that includes an FDA-cleared ECG app for atrial fibrillation detection, a built-in LED flashlight, and a 40-meter dive rating with leakproof metal buttons. The 1.4-inch AMOLED display is paired with a scratch-resistant sapphire lens and a durable titanium bezel, all wrapped in a package that delivers up to 29 days in smartwatch mode and 84 hours in GPS mode. For intervals between expeditions, you can record an ECG by holding the action button, then use the off-grid voice command feature to control watch functions even without a paired phone.

Training readiness draws on HRV status, sleep quality, and recovery history to tell you whether your body is primed for a hard effort or needs rest. Real-time stamina tracking shows your remaining energy reserves during runs, while the multi-band GPS with SatIQ technology adjusts satellite reception to maximize tracking accuracy without draining battery. The strength training plans adapt based on your progress and target injury prevention through load recommendations.

At nearly one thousand dollars for the 51mm AMOLED model, the Fenix 8 is a significant investment. Some users report that the optical heart rate sensor can struggle with stabilization during strength work, occasionally logging impossible calorie burns. A firmware calibration step may be needed to address stiffness in the new metal buttons. But for someone who dives, climbs, trails, and wants a single watch that handles ECG checks, dive logs, and ultrarunning plans, the Fenix 8 is the most capable device in this list.

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The Apple Watch Series 7 remains one of the most accessible FDA-cleared ECG devices on the market, with a sensor that measures blood oxygen and takes a single-lead electrocardiogram directly from the wrist. The Always-On Retina display makes it easy to read your heart rate in direct sunlight, and the crack-resistant front crystal and dust resistance make it durable enough for daily gym sessions, pool laps, and kitchen prep. The cellular model lets you leave your iPhone behind while still receiving calls, texts, and ECG uploads to your health record.

Health tracking depth on the Series 7 includes irregular heart rhythm notifications, sleep stage tracking, fall detection, and the walking steadiness metric that can flag fall risk over time. Users who pair the watch with a DexCom continuous glucose monitor can read their glucose levels directly on the watch face. The gamification of exercise — closing Activity rings, hourly stand reminders, and personalized coaching via Apple Fitness+ — lowers the barrier to maintaining a daily movement practice.

The trade-off is battery life. With typical use, the Series 7 needs a nightly charge, meaning you cannot wear it for overnight sleep tracking without a mid-day top-up. The Series 7 hardware is also older, lacking the temperature sensor and crash detection of newer Ultra and Series 8 models. Still, for someone who wants the most streamlined integration with an iPhone and does not need multi-day battery endurance, the Series 7 offers proven ECG reliability at a lower entry point than the Ultra line.

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The Samsung Galaxy Watch Ultra 47mm LTE is the most capable Android-native ECG smartwatch, combining a titanium case, a 590mAh battery, and Galaxy AI-powered insights across heart rate tracking, sleep analysis, and energy score. The ECG app is FDA-cleared and works in conjunction with irregular heart rhythm notifications, while the BioActive Sensor array captures heart rate with motion filtering to reduce workout noise. The Energy Score feature fuses previous day’s sleep, heart rate, and step data into a single readiness number.

Ruggedness is a central theme — the titanium case survives hiking, rain, dusty trails, and ocean swimming, while the LTE model lets you make calls, stream music, and send SOS alerts without a phone nearby. The programmable buttons can be reversed for left-handed wear, and the 47mm screen is large enough to display full workout metrics, map segments, and current ECG waveform simultaneously. Users report strong battery performance (some staying above 75% after 12 hours), though actual endurance depends heavily on LTE usage and GPS tracking.

The health tracking plateau compared to a Garmin Fenix is noticeable for structured workout plans. While the Galaxy Watch Ultra captures heart rate, sleep, and basic running metrics, it lacks the deep training load analysis and recovery recommendations that serious runners depend on. Some users supplement with third-party apps like Hevy for gym tracking. For an Android user who wants a rugged smartwatch with polished ECG functionality and strong daily wearability, this is the most cohesive package.

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The Amazfit Balance 2 delivers a 1.5-inch sapphire crystal AMOLED display, dual-band GPS from six satellite systems, and up to 21 days of battery life—all without requiring the sticker price typical of premium sports watches. The Zepp OS platform includes an ECG sensor that captures single-lead readings, though it lacks the FDA clearance of Apple or Samsung models, so the data serves more as a wellness signal than a diagnostic file. For casual health monitoring, the HRV, sleep, blood-oxygen, and stress tracking pipeline is robust without driving battery anxiety.

Offline maps with turn-by-turn directions, support for 40,000 golf courses, Hyrox competition mode, and underwater dive tracking up to 45 meters make this a versatile sports watch that punches well above its weight class. The Zepp Flow voice assistant lets you start activities, check stats, and respond to messages without tapping the screen. The aluminum body and silicone band keep the total weight low enough for comfortable 24/7 wear, supporting overnight sleep and HRV logging.

The absence of on-board music storage and the reliance on the Zepp app—rather than a deeply integrated third-party ecosystem—are the primary downsides for users who want streaming services or direct physician portal data exports. The ECG readout is visible on the watch and app but cannot generate a PDF waveform for a cardiologist review. For budget-conscious buyers who prioritize battery life, screen clarity, and multi-sport tracking over formal medical clearance, the Balance 2 offers excellent value.

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The Fitbit Sense 2 distinguishes itself with a continuous electrodermal activity (cEDA) sensor for all-day stress tracking, alongside an FDA-cleared ECG app for atrial fibrillation assessment and irregular heart rhythm notifications. The 24/7 heart rate monitor, SpO2, sleep staging, and health metrics dashboard give a comprehensive overview of your circadian recovery and stress load. The Daily Readiness Score uses your previous day’s activity, sleep, and heart rate variability to tell you whether to push hard or rest, while the built-in GPS tracks outdoor routes without a phone.

The Sense 2’s slim, raised band attachment design improves comfort for all-day wear, especially during sleep tracking. The watch supports on-wrist Bluetooth calls, text notifications, Google Wallet, and Amazon Alexa, making it practical for everyday errands and office use. The three-month Google Health Premium membership includes personalized coaching and advanced analytics, deepening the data you can extract from the ECG and stress metrics.

Build quality concerns surface in long-term reviews. Several users report that charging prongs can clog over time, eventually preventing the watch from charging after 12 to 18 months. Battery life typically starts around six days but may drop to 1.5 days after two years of heavy use. The sync process via the Fitbit app can sometimes stall, requiring multiple attempts. For casual health monitoring where stress data is as important as ECG, the Sense 2 remains a solid option if you plan to upgrade every two years.

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The CARBINOX Edge is built for harsh environments, featuring a stainless steel case reinforced with Gorilla Glass, IP69K dust and water sealing, and a 500mAh battery that delivers up to 25 days of runtime on a single charge. The 1.96-inch AMOLED display is bright and clear, visible even under direct sun or when splashed with mud. While it does not carry FDA clearance for an ECG app, the sensor suite includes heart rate, SpO2, sleep, and stress tracking, and the dual-band GNSS provides phone-free GPS tracking across six satellite systems for remote job sites or trail work.

The rugged build is matched by practical features: Bluetooth calling, AI voice texting, altimeter, barometer, compass, and 23 sport modes. The 22mm quick-release strap fits wrists from 150mm to 240mm and can be swapped for standard bands. Users who work in construction, landscaping, or field services consistently note that the watch survives daily exposure to concrete dust, rain, and vibration that would destroy a consumer-grade smartwatch in weeks. The Carbinox Max app works with both Android and iOS, though iMessage replies are restricted on iPhones.

Quality control appears inconsistent across units. A small number of buyers report that the watch stopped functioning within three months, requiring warranty replacement. The watch is also large and heavy, which some users find uncomfortable for sleep tracking.