1). Apple watch series 6 :
One of the best ECG smartwatches for both men and women.
Key features : Always on display || Built-in ECG || 5 ATM water resistant || Cellular model.
Apple made a significant upgrade to the Apple Watch series with the release of Apple Watch 6. Apple Watch 6 is arguably the best smartwatch out there in terms of performance and quality. The much awaited features of Apple Watch 6 such as SpO2 monitoring, VO2, always-on display, altimeter, and more have been added to the Series 6. Apple Watch Series 6 has ECG and cellular connectivity as well. Though SpO2 and VO2 were present in competitor products much before Apple incorporated them, we truly believe that Apple, with its superior technology and hardware, gives best performance and accuracy of the results. Also, it comes in different styles and hence, is suitable for both formal and casual wear. Apple watch series 6 also comes with multiple strap variants and in my view, one of the best smartwatches for men and women and definitely the best ECG smartwatch out there.
Buy Apple Watch 6 on Amazon.in (India)
Buy Apple Watch 6 on Amazon.com (USA)
2). Apple watch series 4Â
Hold an eye on your heart with the new upgrade of ECG feature.
Key features : In-built GPS || ECG || Cellular variant || Heart rate monitoring || 16 GB internal memory
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The Apple Watch Series 4 is the successor to its predecessors. The Apple watch series 4 is bigger in size compared to series 3 (40 mm & 44 mm). Some differences between the two series include, chipset AppleS4 which is for the Apple watch series 4, and AppleS3 for the series 3. When it comes to RAM 1GB in Apple watch series 4. Apple Watch Series 4 has ECG and cellular connectivity. Both the Apple watch series 4 and its predecessors are upgradeable to OSs released later by Apple.
Apple Watch series 4 has ECG and higher RAM with a fast processor. Apple watch series 4 went through major upgrades in the fitness features and hardware performance. Battery life still needs major improvement. You will also have many watch faces in the app you can choose according to your style. Apple watch series 4 is a slightly expensive but a worthwhile product and is definitely one of the best ECG smartwatches out there.
Read more about Apple Watch 4
Buy Apple Watch 4 on Amazon.com (USA)
3). Samsung galaxy watch active 2 :
Snap your outfit and match your style.
Key features : Stylish design with a touch-enabled bezel for easy navigation || Super AMOLED Display || 5 ATM water resistant (up to 50 m) || Call function || Battery runtime up to 5 days with normal usage.
Samsung Galaxy watch Active 2 is a successor to the Samsung Galaxy watch Active. Samsung Galaxy watch Active faced a number of issues with fitness tracking and other features. Samsung Galaxy watch Active 2 fixed many of the issues of its predecessor and proved to be a worthwhile product. The product costs a little more than Apple Watch 3. Samsung finally released the Samsung Galaxy watch Active 2 smartwatch which is comparable to the Apple Watch series 6.
Samsung Galaxy watch Active 2 is compatible with both iOS and Android versions. Samsung Galaxy watch Active 2 comes at a reasonable price and has multiple price variants. If you carry your phone all the time along with your smartwatch, then you do not need the LTE version. Samsung Galaxy watch Active 2 is equipped with in-built GPS, Samsung Health App, third-party app integration, the accuracy of fitness tracking, bixby voice assistant, samsung Pay, and many more features. Samsung galaxy Active 2 is surely one of the best ECG smartwatches out there.
Read more about Samsung galaxy watch Active 2
Buy Samsung Galaxy Active 2 on Amazon.in (India)
Buy Samsung Galaxy Active 2 on Amazon.com (USA)
4). Apple watch series 5 :
One of the early adopters of always on display.
Key features : Always-on display || Fall detection || Barometric Altimeter || Swim resistance || Heart rate monitoring || ECG
The Apple Watch Series 5 is the first watch series that has an always-on display. Based on the characteristic features you set on your display you can see the dial, at any angle without ever turning on the Apple watch. The Apple Watch 5 is upgradable to watch OS 7, which comes with new watch faces and sleep tracking technology. If you do not care about blood oxygen monitoring that is introduced in Watch 6, you should give a consideration to Apple Watch 5. Apple Watch 5 is an incredible smartwatch with great features and is definitely, one of the best ECG smartwatches out there.
Read more about Apple Watch 5
Buy Apple Watch 5 on Amazon.com (USA)
5). Samsung galaxy watch 3:
A classic digital watch acts as a home for all the fitness tracking features.
Key features : Measures spo2 || LTE variant || In built ECGÂ Â Â Â Â Â Â Â Â Â 
Samsung officially announced the galaxy watch the Samsung galaxy watch 3, which looks like a classic digital watch with all the touch functionalities including some smartphone app controls, fitness tracking, and many more. Samsung galaxy watch 3 comes with the premium smartwatch segment and competes with Apple and Garmin Vivoactive.
If you are not an iPhone user and are looking for an alternative to Apple Watch in the premium segment, then the Galaxy Watch 3 is as close as it can get. Samsung galaxy watch 3 has rotating bezel, built-in GPS, and Samsung health app among others. But on the flip side, the watch is slightly expensive but when it comes to the best ECG smartwatches out there, Samsung Galaxy Watch 3 has to be there.
Read more about Samsung Galaxy Watch 3
Buy Samsung Galaxy Watch 3 on Amazon.in (India)
Buy Samsung Galaxy Watch 3 on Amazon.com (USA)
6). Samsung galaxy watch 4:
An upgraded Samsung model that comes with feature and design upgrades, at a lower price.
Key features: Exynos W920 processor || Works with Wear OS || NFC payments || Water-resistant to up to 5 ATM || Battery life 40 hours || Compatible with Android Smartphone || 3-in-1 health sensor
Overall the best smartwatch with ECG and blood pressure to buy online. It is one of the top smartwatches with an ECG monitor available at present. This smartwatch comes in 2 size variants to suit your style requirements, and you can choose from an array of 4 colors. With a battery life of 40 hours in normal conditions, you can carry on with your workout and other tracking activities for more than a day without worrying about the battery dying down. The 3-in-1 health sensor is a new addition to this smartwatch. The health sensor tracks the heart rate, gives a real-time ECG reading, and the BIA (Bio-electric impedance analysis) measures your body composition and gives you an overall better insight into your health.
The smartwatch can track up to 90 exercises allowing you to work out at ease and track your health and fitness metrics on the go. The sleep tracking features get better insight into your sleeping patterns and in turn, understand any underlying disease conditions. The sleek design has always been a key highlight for all Samsung smartwatches, and this one is no different. The 1.4 inch AMOLED display ensures that you can see the screen clearly while working out in any light for that matter. If you are looking for a reasonably priced smartwatch with oximeter and ECG features, the Samsung Galaxy Watch 4 can be the smartwatch of your choice, available at $249.99 and $349.99 for the normal and classic models, respectively.
Read more about Samsung Galaxy Watch 4
Buy Samsung Galaxy Watch 4 on Amazon.in (India)
Buy Samsung Galaxy Watch 4 on Amazon.com (USA)
7). Amazfit Verge 2 Smartwatch:
A good smartwatch with FDA-Approved ECG monitor and more
Key features: AMOLED display || IP68 dust and water-resistant || Qualcomm Snapdragon Processor || Built-in ECG Monitor || NFC chip for contactless payments
Amazfit Verge 2 is an ECG smartwatch for a reasonable price. The Amazfit Verge 2 ECG Version has Corning Gorilla Glass 3 display with a resolution of 454*454. The touchscreen helps you to switch between functions smoothly. The smartwatch works on Amazfit OS and has a Qualcomm Snapdragon Wear 2500 processor. The circular dial gives it a traditional look.Â
The Amazfit Verge 2 has up to 10 activity tracking modes that include swimming, running, and cycling. The sleep tracking and heart rate tracking feature allows you to keep a track of your health metrics. The all-new ECG monitor helps you get real-time ECG readings. The smartwatch with ECG can store up to 1 hour of data every day locally for up to 7 days for your ease of access. You can register your virtual SIM within the app to use the ECG functionality. The smartwatch also comes with a dual-satellite positioning system. You can also have smartwatch features such as incoming call and text notifications, alarms, weather sensors, you can also make or receive calls from your wrist. Overall, this ECG smartwatch is a must-have smartwatch on your list, available online at a reasonable price. It is one of the 10 best Smartwatches with ECG approved By FDA 2021.
8). Withings move ECG:
With an automatic detection of your heart rate.
Key features: Built in ECG || Sleep tracking || Water resistant || 38mm case  
The Withings Move ECG is a stylish and simple analogue watch with exercise and sleep tracking but also adds an ECG function. There are two face color options, each with five straps to help you buy a watch that suits your style, and the metal bezel used by the ECG function adds a touch of class to proceedings to Withings move ECG. Withings move ECG, if not anything, is one of the best ECG smartwatches in the market right now.
Buy Withings Move on Amazon.in (India)
Buy Withings Move on Amazon.com (USA)
9). Fitbit sense :Â
On wrist EDA scan app which detects electrodermal activity.
Key features : Built in GPS || NFC || Measures spo2 || Detailed sleep tracking 
Fitbit Sense has a strong battery life, excellent sleep tracking and an array of new sensors that could be helpful to some people. The Fitbit sense has many additional features such as stress management, including automatic SpO2 tracking at night, ECG and stress tracker, Google Assistant support and the ability to take calls from your wrist have improved the overall experience of the Fitbit sense.
Read more about Fitbit Sense
Buy Fitbit Sense on Amazon.in (India)
Buy Fitbit Sense on Amazon.com (USA)
10). Withings scan:
Gives a warning if you have any serious atrial fibrillation issues.
Key features : Premium design || Excellent sleep tracker || Long lasting battery 
The Withings Scan Watch is one of the most sensible wearables you can keep track of your health. Withings Scan watch is the best Withings has to offer, the ability to take ECG seems good and useful for those who suffer with heart conditions. If you need to keep an eye on your heart health or overnight breathing, Withings would be the best ECG tracker. Just go and get it.
Additional alternatives with ECG feature
1). Asus VivoWatch SP:
It’s designed to be a unique fitness tracker.
Key features : Calorie count || Step count || 5 ATM water resistant || Touch display       
Asus VivoWatch SP is less of a smartwatch and more of a fitness tracker equipped with all the fitness features, where you can also share your health records with the person you choose. You can also restore files from the cloud, if those files are lost from the device. The Asus VivoWatch SP tracks your heart rate, measures the amount of oxygen present in the blood, tracks your sleep. Asus VivoWatch SPÂ charges very fast and has a good battery life. so the combination of all these features makes Asus VivoWatch SP a worthwhile product. So now it’s your turn to check out this fitness tracker.
Read more about Asus VivoWatch SP
2). Amazfit smartwatch 2 :
Comes with automatic heart rate monitoring.
Key features: Personalized watch faces || ECG || Excellent design || Heart rate tracker                 
The Amazfit smartwatch 2 is good value for money considering as Amazfit smartwatch 2 offers all the features that most people might want in a smartwatch. Amazfit smartwatch 2’s battery life could have been a little better, given the lower price. Even so, Amazfit smartwatch 2 is a solid device with accurate enough tracking and calling features; the watch faces are also pretty good. Offline music storage, If you want a smartwatch that offers a good all round experience, Amazfit smartwatch 2 is worth considering.