8 Best Smartwatch with Oxygen Sensor of 2020

There was a time when people used to exercise almost blindly. They did not set up a target, nor did they have anything to measure the number of calories they have lost. However, the days of working out without an aim are gone forever. 

Best Smartwatch with Oxygen Sensor

Now, you can simply buy a smartwatch with an oxygen sensor and wear it on your hand to track the blood oxygen level. Wearable devices have evolved during the past few years and today wearable tech devices such as smartwatches can take the ECG/EKG with a simple finger touch. Apple Watch Series 6,5 4 and Samsung Galaxy Watch 2 & 3 are a few examples of the best ECG smartwatch in 2020.

Moreover, some of them can also provide you with data on the amount of oxygen in your blood. Therefore, it can be quite useful for sleep monitoring or when you are walking at higher altitudes.

The relevance of smartwatches and fitness trackers with oxygen monitor increases today amid COVID- 19 pandemic. A group of researchers assessed the smartwatch data of COVID-19 patients and found a visible variation in their heart rate, blood oxygen level, and temperature even days and weeks before they were diagnosed with COVID-19. You can find a detailed study here.

Here is another great discussion where Scripps Research on KUSI talks about the wearable tech gadget and ealry identification of COVId-19 Pandemic.

Here, we will shed light on the importance of measuring blood oxygen levels and review some of the best Smartwatch with SpO2 and VO2 Max sensors in the market. So, are you ready for a bumpy ride? Then, let’s not make any further ado, jump right into it! 

Best Smartwatch and Activity Tracker with Oxygen Sensor of 2020

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Before we go further let us have a quick look into some basic details such as what is SpO2, VO2 Max, what is its importance, etc.

What is the Blood Oxygen Level? 

In essence, your body’s blood oxygen level refers to the amount of oxygen that your RBCs are carrying. But why is it essential to know about it? If your blood oxygen level is too low, it might indicate the early signs of a heart attack or any other cardiovascular issues.

Now, the smartwatches tend to measure your blood’s oxygen level through two different procedures, which are – VO2 Max and SpO2. Below, we have provided details on them to help you to differentiate between them. Hopefully, it will help you out in your future endeavor. 

What is the Difference between SpO2 and VO2 MAX?

So, the term, SpO2, refers to the idea of measurement of overall oxygen saturation in your blood. It is usually done by counting the total number of oxygenated hemoglobin, which runs through your arteries.

On the other hand, the VO2 measures the maximum amount of oxygen you can use while exercising. It is generally tested to assess the cardiovascular fitness or aerobic endurance of a person or athlete. 

Another difference between these two is that SpO2 is generally measured in percentage. However, the VO2 Max is usually assessed in millimeters. Otherwise, the purpose of these two is the same. Each of them can help you to understand about your heart’s condition.

Nevertheless, you should never mishmash them with your heart rate, as they are quite different than the latter.

Importance of Oxygen Level Monitoring or SpO2 

So, now, you are probably wondering why you should monitor your blood’s oxygen level? For starters, if your RBCs do not carry the proper amount of oxygen, it could mean that you are probably suffering from a cardiovascular ailment. Secondly, it can also help you to know if you are affected by anemia or not.

Moreover, if you do not have enough oxygen level in your blood, then it may indicate the early signs of lung diseases! Due to these reasons, monitoring your oxygen becomes very crucial for everyone.

Nonetheless, doctors generally do not ask teenagers or young adults to check their SpO2. If you are a health-conscious person, we would ask you to monitor your oxygen level. Advanced smartwatches like Apple Watch Series 6, Samsung Galaxy Watch 3, and Fitbit Sense come with a blood oxygen level sensor along with an ECG sensor.

How do the Smartwatches Track Blood Oxygen? 

The smartwatches generally track the oxygen level of your blood through the pulse oximeter technology. It usually uses pulse oximeter sensors, which measures the saturation or the level O2 in an individual’s blood. But how do the sensors do so?

Well, the pulse oximeter of a smartwatch generally features two LEDs that have different light-based wavelengths. One of them tends to be infrared and, the other one is red. If your blood is oxygenated, then it will consume a lot of infrared light. 

On the other hand, if your blood is deoxygenated, then it will absorb the red one more. 

Top 8 Smartwatches with Oxygen Sensor – Review 

So, as we are done with all the basics about the oxygen level, let’s get back to our review of the best Smartwatch with an Oxygen Sensor in the market. Here is what we have prepared for you! 

Garmin Forerunner 245: Best Smartwatch with SpO2 Sensor 

Garmin forerunner 245 Music Smart Watch

Whether you are thinking about assessing your running, swimming, or cycling activities– the Garmin Forerunner 245 would be ideal for you. The model comes with a SpO2 sensor, which can help you evaluate your blood’s oxygen level, especially when exercising. 

The model has a water-resistance level of 5 ATM. Hence, if you want to, then you can monitor your blood oxygen saturation level even while swimming. Another excellent thing about the watch is that it can track your sleeping schedule while keeping a record of your SpO2 through different phases.

The Garmin Forerunner 245 features a heart rate monitoring system that can help you know about your heart’s condition. While doing some tough exercises, you can also keep your eyes on the watch to know when to stop. There is also a body battery feature available in the model that keeps track of your overall energy level and helps you to rest at the right moment.

  • Features an efficient GPS.
  • Its pulse oximeter sensor is highly efficient.
  • Has an overall battery life of seven days.
  • 5 ATM of the water-resistance level.
  • It can monitor your heart rate.
  • Does not feature an altimeter
  • Misses out on mobile payment apps

Samsung Galaxy Watch 3: Best Smartwatch with O2 and ECG

Samsung Galaxy Watch 3 Review

Unlike most of the Garmin watches, the Samsung Galaxy Watch 3 takes care of the oxygen saturation monitor procedure through both SpO2 and VO2 Max sensor. Hence, with it, you can check out the level of oxygen in your body while you are exercising. 

So, if you see that the level is going down, make sure to stop yourself from exerting yourself and rest. According to a few reviews, the blood oxygen tracker of the device is pretty accurate. So, you can, indeed, take it seriously. The results shall be available on your mobile. 

The watch also features a decent GPS tracker, which can help you go through different places without thinking twice. Also, there are several activity measures available on the device that can help you to keep up with your exercising habit quite discreetly. 

  • Features both SpO2 as well as VO2 Max sensor
  • Has an advance sleep tracking component
  • Comes with a plethora of exercising routines
  • Decent design and outlook
  • Highly durable and efficient
  • Quite expensive
  • Misses out on ECG features

Garmin Vivoactive 4S: Latest O2 Monitoring Watch From Garmin

Garmin Vivoactive 4S

Like all the Garmin models, the Garmin Vivoactive 4S, too, comes with a pulse oximeter or wrist-based SpO2 Monitors. Hence, it can gauge the oxygen level of your blood by evading light through your skin. However, there is no need to worry, as it does not affect your health in any way. 

Besides it, the model can track your energy levels and hydration through the same sensor as well. You can always go through the readings from both your device as well as your smartphone. It will appear as a percentage view.

Additionally, the Garmin Vivoactive 4S features a GPS tracking system, which will keep marking how you are currently running or cycling. Further, it also has 5 ATM water resistance level. So, you can also go swimming with it.

  • Offers excellent accuracy through its SpO2 sensors
  • Its overall durability is top-notch
  • The model supports Garmin Pay and offline music listening modules
  • Comes with several health tracking features
  • 5 ATM water resistance level
  • Its display is a little bit dim
  • Expensive

Garmin Fenix 6: Best Watch for Hikers

Garmin Fenix 6X

When talking about the powerhouses in the smartwatches market, the first name that comes to mind is Garmin Fenix 6. From a general viewpoint, the product generally looks to be more inclined towards the outdoor people. However, even if you tend to do indoor-based exercises, you will still be able to find this model from Garmin to be ideal for you. 

So, for starters, like most other Garmin watches, Fenix 6, too, comes with an efficient SpO2 sensor. According to the reviews, it usually does assess the condition of your blood oxygen level correctly. The pulse oximeter sensor of the product can be used for sleep monitoring as well. However, it would still be better not to use it for medical purposes or readings. You can go through all the details related to this aspect through the smartwatch. 

Moving on, the product comes with an in-built GPS, which ensures precision and enables you to track everything, even in challenging circumstances. Furthermore, with the GLONASS system, you can read your running or cycling speed as well.

  • Offers an advanced GPS tracking
  • Accurate sleep and blood oxygen assessment
  • Features Garmin Pay
  • Excellent durability
  • Can monitor your heart rate
  • Expensive price tag
  • Little bulky.

Garmin Forerunner 945: Best Smartwatch with VO2 Max

Garmin Forerunner 945

Do you consider running to be the best form of exercise for you and, thus, want to keep track of it? Then, Garmin Forerunner 945 should be perfect for you. The model comes with a decent GPS tracking system, which can help you go through tough terrain. Moreover, the model comes with a VO2 Max sensor that can help you track your oxygen saturation level

If you do see that your body’s oxygen level has lowered quite a bit, make sure to stop and rest. Also, the sensor supports altitude acclimation and sleep monitoring as well. Hence, no matter what you are doing, as long as you keep the watch on your hands, you will know about your health condition perfectly.

Besides, the Garmin Forerunner 945 also has a water resistance level of 5 ATM. So, you can use it while swimming indoors and outdoors up to 50 meters underwater. 

However, the only issue with the model is that it does not come with any size options. If you do not really like large watches, we would ask you to avoid this product. Being said, it is the perfect smartwatch for men who like sports watches.

  • Offers accurate data regarding the blood saturation level.
  • Has a water resistance level of 5 ATM.
  • Excellent battery life.
  • Comes with the Garmin Pay app.
  • It can monitor your heart rate.
  • Has only a single size option
  • Requires a dynamics pod

Withings Steel HR Sport Hybrid Smartwatch: Best Hybrid Smartwatch with VO2

Withings steel HR HybridSmartwatch

Unlike Garmin and Fitbit, Withings is a little bit newer in the aspect of blood oxygen level monitor. However, it has improved a lot in this aspect and, thus, can help you keep track of your health profoundly.

The model generally uses the coveted VO2 Max sensor to track the level of O2 in your blood. Hence, it will provide the result while you are running or exercising. The readings seem to be accurate at first. However, when you are going in the long run, it might falter a little bit.

However, according to the reviews, it usually does not happen all the time. So, you would not really have to worry much about it. 

  • Excellent design
  • Comes with decent tracking systems
  • Water-resistant exterior
  • Has a 25-day of battery life
  • Can monitor heart rate
  • The VO2 Max sensor sometimes falters
  • Overall, durability could have been better.

Garmin Vivosmart 4: Best Fitness Tracker with SpO2 

Garmin Vivosmart 4

In essence, the Garmin Vivosmart 4 is one of the latest launches of Garmin. Hence, as you can expect, the model does come with many features that can make your life with exercise a lot easier. For starters, the watch features a decent GPS, which can track your running record through and through.

Furthermore, the product also features a SpO2 sensor, which can help you measure your blood oxygen level at any time of the day. You can see all the details provided by the same on the app as well as the watch. The SpO2 sensor of the model is pretty accurate as well. 

However, unlike other Garmin SpO2 devices, it is limited to only four hours, which is quite disappointing. Anyways, the model is currently available in two different size options (45mm and 40mm). If you choose the 45mm variant, you will also get a much better battery backup, which should be ideal for your cause.

  • Offers accurate blood oxygen level through its SpO2 sensor
  • Features Garmin pay
  • Has an onboard GPS tracking system
  • Can track hydration level, stress, sleep, and many more
  • Comes with a massive water resistance level of 5 ATM
  • The SpO2 sensor only works for four hours
  • Its display could have been a little bit more efficient.

Fitbit Versa 2: Best Smartwatch with VO2 Max

Fitbit Versa 2

The Versa series is one of the prized possessions of Fitbit. Thus, it is no wonder that the devices under the same would be top-notch as well. So, to help you with your endeavor, here, we have decided to talk about one of the latest models, Fitbit Versa 2. 

The model comes with an in-built VO2 Max sensor for starters, which can help you keep track of your blood oxygen level. It works continuously, even while you are sleeping. However, you will have to check the app to know more about your blood oxygen level information.

The model also features a decent processor, which helps it to work faster and more proficiently. There is also an in-built microphone available in the model. With it, you can ask Alexa to do anything and everything for you. 

Even though it is one of the best smartwatches with VO2 Max in the market, it still does not feature an in-built GPS sensor. Hence, with it, you will not be able to track the route that you are currently running unless you carry a smartphone with you. 

  • The O2 tracking accuracy of the model is almost perfect
  • Can monitor your heart rate
  • Comes with Fitbit Pay and Amazon Alexa
  • Exquisite design
  • Has a battery life of five days
  • Oxygen level displayed in
  • Does not feature an in-built GPS


After reading the article, now you should know best smartwatches with oxygen sensor to track blood oxygen level. All the smartwatches and fitness trackers discussed here comes with advanced sensors to track the SpO2 or VO2 Max accurately.

Apple Watch 6, Galaxy Watch 3, and Fitbit Sense are the example of the best smartwatches that can measure blood oxygen saturation levels along with ECG.

Disclaimer: Even though most models, which are mentioned, do provide accurate results, you should never use them for medical purposes. Replacing them with medical equipment or tool is also not advisable for anyone. 

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