Our readers keep the lights on and my morning glass full of iced black tea. As an Amazon Associate, I earn from qualifying purchases.9 Best Smartwatch With ECG | Skip the Charging, Not the Beat

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The Series 11 captures a single-lead ECG in 30 seconds through the digital crown and back crystal, classifying the rhythm as sinus, AFib, or inconclusive with FDA-cleared algorithms. The new Vitals app surfaces overnight metrics — heart rate, respiratory rate, wrist temperature, and blood oxygen — into a single daily health status card. For iPhone users, this is the cleanest integration point for on-wrist ECG recording and PDF export to your doctor.

Battery life hits the advertised 24 hours even with the always-on display enabled, and fast charging pushes it to 80% in roughly 45 minutes. The 46mm natural titanium case feels noticeably lighter than previous stainless steel models, making 24/7 wear for sleep tracking and overnight heart rate monitoring genuinely comfortable. The scratch-resistant glass endured two weeks of gym sessions and trail runs without a single micro-scratch.

The hypertension notification feature — analyzing how blood vessels respond to each heartbeat — is currently in beta but points toward the future of passive cardiovascular screening. Just know that the full ECG trace review requires the iPhone Health app; the watch shows the classification result only.

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The Ultra 3 packs the same FDA-cleared single-lead ECG found in the Series 11 but wraps it in a 49mm titanium case with a sapphire crystal display that shrugs off rock scrapes and granite dust. Water resistance extends to 100 meters, and the built-in dual-frequency GPS maintains lock even in deep canyons. For backcountry runners or ocean swimmers who need ECG access without babying their gear, this is the only real option.

Battery life stretches to 42 hours of normal use and up to 72 hours in low power mode — enough to skip a night of charging without missing overnight heart rate data. The customizable Action Button can be programmed to launch the ECG app instantly, removing the need to navigate menus with wet or gloved fingers. Satellite SOS works when cellular and Wi-Fi drop entirely, adding a safety net for solo expeditions.

The flat sapphire face is prone to reflections in direct sunlight, and the 2.24-ounce weight is noticeable on smaller wrists during sleep. Pair it with a silicone Ocean Band for swimming or a Trail Loop for all-day wear to avoid the metal band scratching the titanium case.

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The Galaxy Watch Ultra brings Samsung’s BioActive sensor array — optical heart rate, bioelectrical impedance, and ECG — into a titanium body rated to 10 ATM water resistance. The ECG app records a 30-second trace through the home button electrode and back sensor, classifying sinus rhythm, AFib, or inconclusive using Samsung’s FDA-cleared algorithm. For Android users, this is the most feature-complete ECG watch available, with the added capability of blood pressure monitoring after calibration with a traditional cuff.

The 590 mAh battery is the largest among ECG smartwatches at this tier, delivering roughly 60 hours with the always-on display disabled. LTE connectivity allows ECG data upload and emergency alerts without a phone nearby. The dual-frequency GPS keeps pace with the Garmin Forerunner 970 on trail runs, and the running coach feature adjusts pace recommendations based on real-time heart rate and oxygen saturation.

The ECG app only functions after installing the Samsung Health Monitor app, which is region-restricted and may require sideloading on non-Samsung Android phones. Users of Pixel or OnePlus devices should verify compatibility before buying.

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The Forerunner 970 integrates ECG via the top right button and back lens, recording a 30-second trace that the Garmin Connect app classifies as sinus or AFib using an FDA-cleared algorithm. What sets it apart from the Apple and Samsung options is the depth of running-specific metrics — running economy, step speed loss, ground contact time, and wrist-based running power all appear alongside the ECG report. For a triathlete who needs heart rhythm data and form analysis in one device, nothing else comes close.

The 1.4-inch AMOLED display is 30 percent brighter than the previous Forerunner 965, and the built-in LED flashlight provides extra visibility during early morning runs. Battery life reaches 15 days in smartwatch mode and 26 hours in full GPS mode, which means you can leave the charger at home for a weeklong training camp. The sapphire lens survived a direct strike against a granite boulder during a trail run with zero damage.

The ECG app requires the user to be 22 years or older and is not available in all countries. Garmin’s approach to ECG is more cautious than Apple’s — traces are recorded on-watch but the full report and classification only appear after syncing to the phone.

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The ScanWatch Nova is a traditional analog watch with a hidden digital heart. The stainless steel bezel doubles as the ECG electrode, and the back crystal holds the optical sensors. Pressing the crown for 30 seconds records a single-lead ECG that the Withings Health Mate app classifies as sinus, AFib, or inconclusive using FDA-cleared algorithms. The small secondary digital display shows heart rate and SpO2 without distracting from the analog hands.

The 30-day battery life is the headline number, but real-world usage with daily HR streaming and one ECG per week lands closer to 25 days. That still means you charge once a month, not once a night. The TempTech24/7 module tracks baseline body temperature continuously, which is useful for spotting early signs of illness or ovulation shifts. The SpO2 sensor measures on-demand and overnight, with breathing disturbance tracking that feeds into the respiratory health score.

The Bluetooth range is noticeably shorter than competing watches — notifications drop when the phone is more than 20 feet away in a typical house. The stainless steel band is attractive but requires a tool to resize, and the hybrid design means no always-on color display for maps or rich notifications.

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The Sense 2 uses the same ECG hardware as the Versa 4 — a single-lead trace recorded by placing your finger on the bezel — but adds a continuous electrodermal activity (cEDA) sensor that tracks body response to stress 24/7. When stress levels spike, the watch prompts a guided breathing session and logs the event to the Health Metrics dashboard. For users whose AFib episodes are triggered by anxiety or high stress, this combination provides context that a standalone ECG cannot.

The Daily Readiness Score combines overnight heart rate variability, sleep quality, and activity load to tell you whether your body is primed for a hard workout or needs recovery. Skin temperature variation tracking helps identify early signs of illness. The built-in GPS and 40+ exercise modes cover most workout types without needing a phone nearby. Battery life averages four to six days depending on how often the SpO2 and cEDA sensors sample overnight.

The bundled charger dock and screen protectors add value, but the proprietary charging cable is a weak point — several reports of connection failure after three to four months. The silicone band also causes skin irritation for some users, particularly during extended wear, so plan on replacing it with a woven or leather band if sensitivity is a concern.

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The Galaxy Watch 7 runs the same BioActive sensor array as the Galaxy Watch Ultra but in a more accessible form factor. The ECG app records a 30-second trace through the home button and back sensor, classifying sinus or AFib with the same FDA-cleared algorithm. The 3nm Exynos W1000 processor handles ECG recording, body composition scans, and continuous heart rate monitoring without stutter or lag — a noticeable upgrade from the Watch 6 series.

The AI-powered Energy Score uses overnight heart rate, sleep consistency, and activity data to give a daily readiness number. Sleep apnea detection is included as a new feature, using overnight oxygen saturation drops to flag potential breathing disturbances. Dual-frequency GPS provides accurate location tracking even between tall buildings, though accuracy slightly trails the Garmin Forerunner 970 on dense tree-covered trails.

The 300 mAh battery delivers roughly 30 hours with the always-on display enabled — enough to wear to bed and charge the next evening. The 40mm case is compact and comfortable on smaller wrists, but the 20mm silicone band is narrow and some users find the buckle closure finicky during workouts.

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The Versa 4 captures a single-lead ECG through the EDA Scan app — place your palm flat on the watch face, hold still for 30 seconds, and the associated Fitbit app classifies the rhythm. It is the most affordable entry point into FDA-cleared ECG tracking, making it a logical choice for those who want basic AFib screening without the flagship price. The 6+ day battery life is excellent for an always-on color display, and the built-in GPS tracks outdoor runs without a phone tether.

The Daily Readiness Score synthesizes overnight heart rate variability, sleep quality, and activity data to guide training intensity. The Stress Management Score uses heart rate patterns to flag elevated strain, and the health metrics dashboard shows SpO2, skin temperature, and breathing rate trends over 90 days. For managing conditions like Type 2 diabetes — where monitoring heart rate variability alongside glucose levels is useful — this watch provides the data chain without overwhelming the interface.

The ECG trace is not stored on-watch; it requires the Fitbit app on the phone to view the full waveform. The silicone band has been widely reported to cause skin peeling and blistering, particularly in humid conditions. Users recommend swapping to a fabric or metal band immediately to avoid contact dermatitis.

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The Active Max is the only watch on this list that does not carry FDA clearance for its ECG-like heart rhythm analysis. It uses a BioCharge optical sensor to estimate heart rate variability and stress levels, flagging irregular pulse patterns through the Zepp app. This is not a true single-lead ECG trace — it cannot classify AFib with clinical confidence. For buyers who want continuous heart monitoring and 25-day battery life on a budget, it serves as a capable fitness tracker, but it should not be relied upon for arrhythmia detection the way the Apple, Samsung, or Garmin models can.

The 1.5-inch AMOLED display peaks at 3,000 nits, making it the brightest screen in this comparison by a wide margin — readable under direct desert sun or in full snow glare. Offline maps with turn-by-turn navigation are stored in the 4GB onboard memory, and the five-system GPS (GPS + GLONASS + Galileo + BeiDou + QZSS) locks in under 10 seconds even in remote areas. The Zepp Coach feature generates adaptive training plans for 5K, 10K, and half-marathon distances based on your sleep and HRV data.

The heart rate and SpO2 sensors correlate well with medical-grade devices during rest, but accuracy drops during high-intensity interval training above 150 bpm. The BioCharge Energy Score provides a useful training readiness indicator but lacks the clinical validation of the Readiness Score from Fitbit or the Energy Score from Samsung.