
The Fitbit Sense smartwatch is a highly anticipated device that promises to take your fitness tracking to the next level. It offers advanced health monitoring features, including electrodermal activity (EDA) sensing, which can detect stress levels.
This smartwatch is designed to be worn all day, every day, and its battery life can last up to 6 days on a single charge. It's also water-resistant up to 50 meters, making it perfect for swimming or other water-based activities.
One of the standout features of the Fitbit Sense is its ability to track your sleep patterns, including stages of sleep and sleep quality. It can also monitor your heart rate and rhythm, providing valuable insights into your overall health.
The Fitbit Sense also comes with built-in GPS, allowing you to track your runs, hikes, and other outdoor activities without needing to bring your phone along.
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Features
The Fitbit Sense is packed with features that make it a powerful tool for tracking your health and wellness.
It comes with a built-in ECG app that can detect signs of atrial fibrillation (AFib) right from your wrist. This can be a lifesaver for people who are at risk of heart conditions.
The Sense also has a skin temperature sensor that tracks changes in temperature for early health awareness. This feature can be especially useful for people who live at high altitudes or experience temperature fluctuations.
One of the standout features of the Sense is its ability to track heart rate variability (HRV) and breathing rate. This can provide valuable insights into your nervous system and respiratory patterns.
With the Sense, you can also track your stress levels throughout the day using the stress management score. This score can help you understand how your body responds to stress and identify areas for improvement.
The Sense also has a sleep score, which breaks down your sleep data each month and pinpoints how you can improve sleep based on 10 key sleep metrics.
Here are some of the key features of the Fitbit Sense:
The Sense also has a built-in GPS, which allows you to track your pace and distance without needing your phone. This feature can be especially useful for runners and cyclists.
With the Sense, you can also log your workouts and track your progress over time. The watch has 40+ exercise modes, including running, cycling, and swimming.
Overall, the Fitbit Sense is a powerful tool for tracking your health and wellness. Its advanced features and sleek design make it a great choice for anyone looking to take their fitness to the next level.
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Design and Durability
The Fitbit Sense has a familiar design if you're upgrading from the Versa, with a stainless steel edge and new sensors inside. It's a tiny bit thicker than the Versa, but still comfortable to wear.
The Sense features a touchscreen and an indented haptic side button that can launch Alexa or the Google Assistant, or start a workout. This button feels more comfortable than the Versa 2, especially during workouts and at bedtime.
The watch has a more rounded finish, which makes it more comfortable to wear. The fiddly toggles used to switch out straps on earlier Fitbits are gone, replaced by quick release buttons that make swapping bands out a lot easier.
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The Fitbit Sense has a faster processor than the Versa 2, making interactions with the watch feel snappier. However, it still experiences some lag when opening apps or swiping up to see daily stats.
The charging station has been improved, with a new magnetic charger that easily attaches to the back of the watch. This is a big upgrade from the alligator-style clips used on earlier Fitbits.
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Performance and Accuracy
The Fitbit Sense is a powerhouse when it comes to tracking your daily activities.
It uses a combination of GPS, accelerometer, and gyroscope sensors to track your movements with high accuracy.
This means you can rely on it to track your runs, hikes, and other outdoor activities with ease.
Fitbit Sense also tracks your heart rate continuously throughout the day, providing a detailed picture of your cardiovascular activity.
This data can be used to identify patterns and trends in your heart rate, helping you to optimize your fitness routine.
With its advanced algorithms and machine learning capabilities, Fitbit Sense provides personalized insights and recommendations to help you reach your fitness goals.
Sleep Stages

Sleep stages are a fascinating topic, and the Fitbit Sense has made it surprisingly accessible. You can get matched with a sleep animal and see a personalized analysis of your sleep every month.
This feature is a fun way to visualize your sleep patterns, and it can even help you identify areas for improvement. The sleep animal is a cute way to represent your sleep habits, and it might just motivate you to get better sleep.
The sleep analysis is also super detailed, giving you insights into your sleep quality, duration, and stages. This information can be really valuable in helping you understand your sleep patterns and make positive changes.
To access this feature, you'll need a Fitbit Premium membership, which is a worthwhile investment if you're serious about tracking your sleep.
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GPS and HR Accuracy
GPS and HR Accuracy is crucial for tracking performance, but did you know that GPS signals can be affected by satellite geometry and ionospheric delays? This can lead to errors of up to 10 meters.
Most wearable devices and smartwatches use a combination of GPS, GLONASS, and Galileo signals for accurate tracking. This is why it's essential to choose a device that supports multiple satellite systems.
The accuracy of heart rate monitoring (HRM) also plays a significant role in tracking performance. A study found that HRM accuracy can be influenced by factors such as skin contact and motion artifacts.
Battery Life Falls Short of Expectations
Battery life is a crucial aspect to consider when choosing a fitness tracker, and unfortunately, the Sense falls short of expectations.
The Sense can meet the two-day battery life claim when the always-on display is active, but that's about it.
Outdoor workouts seem to be a major battery drain, with the battery dipping almost 50% after a 2.5 hour bike ride.
Turning off the always-on display and using the raise to wake feature can boost battery life to around 4.5 days between charges.
Limitations and Comparison
The Fitbit Sense has some limitations to consider. Not intended for use by people under 22 years old.
The Sense has a range of features, but it's worth noting that some of them require a Fitbit Premium subscription. For example, the Daily Readiness Score is only available with Premium.
In terms of tracking, the Sense has 24/7 heart rate monitoring, as well as SpO2 and skin temperature tracking. It also has a built-in GPS, which is a plus for runners and cyclists.
One notable feature of the Sense is its ECG app, which can detect irregular heart rhythms. However, this feature is only available in select countries and with select Fitbit products.
The Sense has a range of sensors, including a heart rate sensor, ECG sensor, SpO2 sensor, temperature sensor, and EDA sensor. It also has NFC for contactless payments.
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The Sense has a battery life of up to 6+ days, and it's water resistant up to 5 ATM.
Sport and Fitness
The Fitbit Sense is a great tool for tracking your fitness goals. The Sense has finally brought back onboard GPS, so you don't have to take your phone with you on an outdoor run or ride to track your route.
It takes around 10 seconds to acquire a lock when you start an outdoor activity, with or without your phone nearby. This is a huge improvement over previous Fitbits that launched after the Ionic in 2017.
The Sense also has a brighter screen than the Versa and earlier Fitbit trackers, making it relatively easy to see in sunlight as long as you ensure the brightness is set to maximum.
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Stress and Sleep
Managing stress and getting quality sleep are crucial for both physical and mental well-being. A cEDA sensor can help identify potential signs of stress so you can reflect on your emotions and take action.
This feature can be a game-changer for those who struggle with stress. It's like having a personal coach that alerts you to potential stressors, allowing you to make positive changes.
To get a better understanding of your sleep patterns, you can track your sleep with a device that matches you with a sleep animal. This unique approach provides a personalized analysis of your sleep every month.
Sleep tracking can help you identify areas for improvement, such as establishing a consistent sleep schedule or creating a relaxing bedtime routine.
Fitness Tracking: Evolution Stagnant
Fitness tracking has been a staple of wearable tech, but it's surprising how little it's evolved in recent years. Not much has changed since the Fitbit Ionic in 2017.
One of the downsides of newer Fitbits was the lack of onboard GPS, but that's finally been addressed with the Charge 4 and now the Sense. It takes around 10 seconds to acquire a lock when you start an outdoor activity.
You'll still be able to track your steps, start a goal-based workout, and see your heart rate zone, just like with other recent Fitbits. The Sense has some advantages in a workout, though - its screen is brighter than earlier models, making it easier to see in sunlight.

The Sense also has a comfortable design that doesn't get in the way, even when you're working up a sweat. Its flat profile is a big plus.
Heart rate tracking accuracy is a crucial aspect of fitness tracking, and the Sense is decent but not perfect. It matched up fairly consistently to a chest strap for resting heart rate, but took at least 5 to 10 seconds to catch up during a workout.
Frequently Asked Questions
Is the Fitbit Sense being discontinued?
Yes, the Fitbit Sense smartwatch has been discontinued by Google, which acquired Fitbit in 2021 and has since phased out several devices.
Which is better, Fitbit Sense or Sense 2?
The Fitbit Sense 2 offers more accurate heart rate readings and sleep tracking due to its advanced sensors and algorithms. If you're looking for a detailed fitness experience, the Sense 2 is the better choice.
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