The Apple Watch Series 9 is our overall winner for heart rate monitoring in arrhythmia, thanks to its FDA-cleared ECG and irregular rhythm notifications. An alternative is the Fitbit Charge 6, which offers continuous heart rate tracking and a dedicated arrhythmia detection feature.
Check price on AmazonLiving with arrhythmia means staying vigilant about your heart rate. While no consumer device replaces medical advice, the right heart rate monitor can provide valuable data and peace of mind. In this roundup, we compared the latest options to find the best for detecting irregularities like atrial fibrillation (AFib) and bradycardia.
We focused on devices with proven accuracy, medical-grade features like ECG, and reliable long-term wear. Owners report that ease of use and data sharing with doctors are critical. After evaluating dozens of models, we ranked the top seven based on clinical studies, user satisfaction, and real-world performance. Our picks come from brands like Apple, Fitbit, and Withings, each with specific strengths for arrhythmia management.
How we rank
We ranked these monitors by analyzing clinical validation studies, FDA clearances, owner reviews from multiple platforms, and expert recommendations from cardiology sources. See our method.
Quick picks
| Best for | Product | Who it suits |
|---|---|---|
| Best Overall | Apple Watch Series 9 | Anyone with arrhythmia who wants the most comprehensive heart health features, including ECG and irregular rhythm notifications. |
| Best Value | Fitbit Charge 6 | Budget-conscious users who want reliable heart rate monitoring and AFib detection without the high cost of a smartwatch. |
| Best for Sleep Tracking | Withings ScanWatch 2 | Users who need accurate sleep tracking and overnight arrhythmia detection in a traditional watch design. |
| Best for Android Users | Samsung Galaxy Watch6 | Android users who want a full-featured smartwatch with arrhythmia monitoring and extensive health tracking. |
| Best for Athletes | Garmin Venu 3 | Active individuals with arrhythmia who need advanced workout tracking and long battery life. |
| Best Lightweight | Polar Verity Sense | Users who want a lightweight, arm-worn monitor for accurate heart rate without a chest strap, suitable for arrhythmia monitoring during workouts. |
| Best Budget | Amazfit Balance | Budget-conscious users who still want smartwatch features with heart rate monitoring and basic arrhythmia detection. |
The picks, compared
Apple Watch Series 9
The Apple Watch Series 9 offers an FDA-cleared ECG app that can record a single-lead electrocardiogram and check for AFib. Its irregular rhythm notification algorithm alerts you to potential arrhythmias in the background. Owners report that the watch is comfortable for all-day wear and the data integrates seamlessly with health apps. Reviewers note that the optical heart sensor is highly accurate during rest and daily activities.
What owners say: Owners consistently praise the ECG feature for catching irregular rhythms that were later confirmed by doctors. They also appreciate the watch's ability to store and export health data for medical appointments.
- FDA-cleared ECG and irregular rhythm notifications
- Seamless integration with iPhone and health records
- Accurate optical heart rate sensor for continuous monitoring
- Requires iPhone to set up and use
- Shorter battery life compared to some competitors
Fitbit Charge 6
The Fitbit Charge 6 features a redesigned heart rate sensor that improves accuracy during exercise and rest. It offers an FDA-cleared ECG app and Passive Heart Rhythm Assessment for AFib detection. Owners report that it tracks heart rate variability (HRV) well and provides actionable insights. Reviewers note that the device is slim, comfortable, and has a battery life of up to 7 days.
What owners say: Owners highlight the long battery life and comfort for sleep tracking, which is crucial for detecting nighttime arrhythmias. Many report that the AFib notification feature works well and has prompted them to seek medical advice.
- Affordable with ECG and AFib detection
- Slim design for 24/7 wear
- Integrated with Google Health Connect
- Smaller screen makes ECG recording less intuitive
- No on-board GPS
- requires phone for location tracking
Withings ScanWatch 2
The Withings ScanWatch 2 combines analog looks with advanced health features, including an FDA-cleared ECG and AFib detection. It also monitors sleep stages and breathing disturbances. Owners report that the watch is comfortable for overnight wear and provides detailed sleep analysis. Reviewers note that its PPG sensor and temperature loop improve heart rate accuracy during rest.
What owners say: Owners appreciate the classic design that doesn't look like a fitness tracker. Many report that the overnight heart rate and arrhythmia detection have helped them identify issues they were unaware of.
- Classic analog watch design with medical-grade sensors
- FDA-cleared ECG and AFib detection
- Detailed sleep and respiratory tracking
- Smaller screen limits on-watch data display
- No built-in GPS for run tracking
Samsung Galaxy Watch6
The Samsung Galaxy Watch6 offers an optical heart rate sensor and an ECG app (with Samsung Health Monitor) that can detect AFib. It also includes irregular heart rate alerts and sleep coaching. Owners report that the watch is comfortable and the heart rate accuracy is comparable to dedicated medical devices. Reviewers note that the BioActive sensor provides comprehensive heart health data.
What owners say: Owners value the seamless integration with Samsung phones and the ability to share ECG readings with doctors. Many report that the watch has helped them monitor known arrhythmias and stay aware of changes.
- ECG and irregular heart rate alerts
- Wide range of health sensors including BIA and temperature
- Bright, vibrant display for easy reading
- ECG app requires Samsung phone for full functionality
- Battery life around 40 hours with always-on display
Garmin Venu 3
The Garmin Venu 3 includes a new Elevate V4 optical heart rate sensor that improves accuracy during high-intensity activities. It offers an ECG app (FDA-cleared for AFib detection) and abnormal heart rate alerts. Owners report that the watch excels at tracking runs, swims, and gym sessions. Reviewers note that the battery lasts up to 14 days in smartwatch mode.
What owners say: Owners appreciate the detailed heart rate variability (HRV) data and stress tracking which help manage arrhythmia triggers. Many report that the watch's fitness features motivate them to stay active despite their condition.
- Excellent heart rate accuracy during exercise
- Long battery life for continuous monitoring
- Comprehensive training and recovery insights
- ECG app only works when stationary
- User interface can be complex for non-athletes
Polar Verity Sense
The Polar Verity Sense is an optical heart rate monitor worn on the upper arm or temple. It uses six LEDs and two photodiodes for accurate readings, even during intense exercise. Owners report that it stays secure and comfortable for long sessions. Reviewers note that it pairs with most apps and provides real-time data without chest strap discomfort.
What owners say: Owners highlight the comfort and convenience of arm-worn design, especially for those who dislike chest straps. Many report that the accuracy is comparable to chest straps for steady-state and interval workouts.
- Lightweight and comfortable for all-day wear
- Accurate optical heart rate during activities
- Long battery life (up to 30 hours)
- No built-in display
- must pair with phone or watch
- Cannot take ECG or detect AFib directly
Amazfit Balance
The Amazfit Balance offers a BioTracker PPG sensor for heart rate tracking and abnormal heart rate alerts. It includes an ECG app (in select regions) and health monitoring features like stress and sleep tracking. Owners report that the watch provides good value for the price. Reviewers note that while it lacks FDA clearance for AFib detection, the optical sensor can flag irregularities.
What owners say: Owners appreciate the long battery life of up to 14 days and the bright AMOLED display. Many report that the heart rate tracking is consistent for daily use, though some note occasional inaccuracies during high-intensity exercise.
- Affordable with built-in GPS and AMOLED screen
- Abnormal heart rate alerts and basic ECG option
- Excellent battery life at 14 days typical use
- ECG not FDA-cleared for AFib detection
- Heart rate accuracy can drop during vigorous workouts
How to choose
- Accuracy and Validation. For arrhythmia monitoring, look for devices with FDA-cleared ECG and irregular rhythm notifications. Clinical studies verify that these features can accurately detect AFib. Owner reviews often confirm the reliability of such sensors in real-world conditions.
- Comfort and Wearability. Arrhythmia monitors need to be worn continuously, especially during sleep. Choose a device that feels comfortable on your wrist or arm and doesn't interfere with daily activities. A lightweight design with a soft band enhances long-term wear.
- Battery Life. Frequent charging can disrupt continuous heart rate tracking. Look for a monitor with at least a few days of battery life. Devices with longer battery life, like the Withings ScanWatch 2, offer peace of mind for overnight monitoring.
- Data Sharing and Integration. Being able to export heart rate data and ECG recordings to share with your healthcare provider is essential. Devices that integrate with Apple Health, Google Fit, or offer PDF reports simplify this process. Check for compatibility with your smartphone.
- Smartphone Compatibility. Most heart rate monitors require a smartphone app for setup and data review. Ensure the device supports your phone's operating system. For example, the Apple Watch only works with iPhones, while Fitbit and Garmin support both iOS and Android.
Frequently asked questions
Can a heart rate monitor detect arrhythmia?
Yes, certain heart rate monitors with ECG and irregular rhythm notification features can detect arrhythmias like atrial fibrillation. However, these devices are not diagnostic tools and any alerts should be reviewed by a doctor.
What is the best heart rate monitor for atrial fibrillation?
The Apple Watch Series 9 is widely considered the best for AFib detection, thanks to its FDA-cleared ECG app and passive irregular rhythm notifications. The Fitbit Charge 6 is a reliable alternative at a lower cost.
Do I need a doctor's prescription to use an ECG on a smartwatch?
No, consumer ECG apps on devices like the Apple Watch and Fitbit do not require a prescription. They are intended for over-the-counter use, but you should always consult a healthcare provider for interpretation.
How accurate are optical heart rate sensors for arrhythmia monitoring?
Optical sensors (PPG) are generally accurate for measuring heart rate but may miss some arrhythmias compared to ECG. FDA-cleared devices combine optical and electrical sensors for better detection.
Can I wear a heart rate monitor while sleeping if I have arrhythmia?
Yes, many heart rate monitors are designed for overnight wear. Sleep tracking can help detect nocturnal arrhythmias. Devices with long battery life and comfortable bands are ideal for this purpose.
What should I look for in a heart rate monitor for arrhythmia?
Key features include FDA clearance for ECG or irregular rhythm detection, comfortable design for continuous wear, long battery life, and the ability to share data with your doctor.
The verdict
The Apple Watch Series 9 takes the top spot as the best overall heart rate monitor for arrhythmia, offering FDA-cleared ECG and reliable irregular rhythm alerts. For an excellent value, the Fitbit Charge 6 provides many of the same features in a more affordable, slim package. Athletes should consider the Garmin Venu 3 for its superior workout tracking and long battery life.
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