Fitbit Charge 3 vs Polar A370 Comparison

Most fitness trackers nowadays can perform a wide range of functions, such as smartphone interaction and physical activity assistance. Yet, they become a vital role in your daily life. What’s on your mind right now may be the consideration between Fitbit Charge 3 vs. Polar A370. Which one is better? Which one should you buy, Fitbit Charge 3 or Polar A370?

Don’t worry. We got your back. In this article, we will layout 6 of the essential criteria for when it comes to choosing a fitness tracker. Also, we will compare head-to-head Fitbit Charge 3 vs. Polar A370 and help you refine your buying decision. Stay tuned and read on!

6 Considerations When Choosing Fitbit Charge 3 vs. Polar A370


Criteria           Fitbit Charge 3Polar A370
Dust-proof and water-resistantYesYes
Branded damage-resistant glassYesNo
Replaceable watch bandYesYes
OLED or AMOLED displayYesNo
Always-On DisplayNoNo
Water-proof depth rating50m30m
Sapphire glass displayNoNo
Built-in clipNoNo

First of all, for those seeking a fitness tracker that can become your resilient companion in the most sporty adventurous, Fitbit Charge 3 and Polar A370 could please fulfill your demand with dust-proofing, sweat-resistance and water-resistance, even they are not up-to-date with sapphire glass display like the top-notch segment. Both manufacturers offer a replaceable watch band for their products, give them the flexibility of the outlook. For those who want something a little bit sleeker, it is a bit let down that they don’t have a built-in clip.

For the comparison, this section is where Fitbit Charge 3 scores itself. They are both possess display, but touchscreen and  AMOLED display is only facilitated on Fitbit Charge 3. Fitbit Charge 3 is also more endurant than its counterpart, with a branded damage-resistant glass and withstand a water depth threshold up to 50m, compared to just 30m of Polar A370. It seems like since the Fitbit Charge 3 is optimized the display thoroughly, it is 8g lighter than Polar A370.

In this round, Fitbit Charge 3 wins easily as all the yeses Fitbit possesses in this table.


Criteria           Fitbit Charge 3Polar A370
Heart rate monitorYesYes
Blood oxygenation level monitoringYesNo
Temperature sensorYesYes
Monitors perspirationNoNo
Cadence sensorNoNo
3D compassNoNo

In terms of sensors, Fitbit Charge 3 and Polar A370 quite identical, as this section is not a sweet spot of a fitness tracker. Heart rate monitor, accelerometer, and temperature sensor, which could provide you some essential data, are offered by Fitbit Charge 3 and Polar A370. But Fitbit can meet the need of those looking for in-depth data, with an extra blood oxygenation level monitoring, which Polar A370 does not have.

Activity tracking

Criteria           Fitbit Charge 3Polar A370
Distance trackingYesYes
Walking step taken trackingYesYes
Sleep trackingYesYes
Sleep reportingYesYes
Calories burnt trackingYesYes
Pace trackingYesYes
Activity reportsYesYes
Elevation trackingYesNo
Route trackingNoNo
Multi-sport modeYesYes
Goal setting modeYesYes
Exercise taggingYesYes
Stroke recognitionYesNo
Stroke counter for swimmingYesNo
Weight trackingYesNo
Water intake trackingYesNo
Diving compatibleYesNo
Detects activities automaticallyYesYes
Calorie intakeNoNo
Fat consumptionNoNo

Activity tracking is a section that worth your consideration the most towards a fitness tracker. First of all, distance tracking, walking step taken monitoring, sleep tracking, sleep reporting, calorie burnt tracking, pace tracking, activity reports are features that can involve in every aspect of your daily basis.

Fitbit Charge 3 and Polar A370 are also offered multi-sport mode, goal setting mode, exercise tagging, and automatic activity detection to sort out all of your data, from particular sports to general training, make it easier for you to analyze the reports. The flaws are in which route, calorie intake, and fat consumption are not in their tracking rada, but they are more than good enough for that vast majority of users.

Regards to the differences, once again, Fitbit Charge 3 outperforms Polar A370 with specifications for diving and swimming, particularly stroke recognition, stroke counter, and diving compatibility, while Polar A370 is still restricted to such sports. The data Fitbit Charge 3 indicates to users is also more clear-cut than Polar A370 with extra weight tracking and elevation tracking.


Criteria           Fitbit Charge 3Polar A370
Android compatibleYesYes
iOS compatibleYesYes
Windows Phone compatibleYesNo
Syncs wirelesslyYesYes
Automatically syncsNoNo
NFC connectivityNoNo
ANT+ connectivityNoNo
Supports Wi-FiNoNo
Cellular moduleNoNo
Windows compatibleYesNo

When it comes to connectivity, Fitbit Charge 3 and Polar A370 supports mostly every device as they are quite harmonious with the Android and iOS platforms. Fitbit Charge 3 and Polar A370 back up with the ability to sync wirelessly. Still, they have the downside, which is the absence of many modernized connections such as NFC, ANT+, Wi-Fi, cellular module, and automatic sync.

It will cause a little bit of inconvenience, but still, in the ordinary situation, it is more than what you need. The only difference here is Fitbit Charge 3 opens up a whole new audience of potential buyers as Fitbit’s target is widens to Window’s fans, with the compatibility with Windows platform and Windows Phone. So for the rest of you, it is a draw in this round.


Criteria           Fitbit Charge 3Polar A370
Battery life7 days4 days
Wireless chargingNoNo
Battery level indicatorYesYes
Rechargeable batteryYesYes
Solar power batteryNoNo
Removable batteryNoNo

In terms of battery, Fitbit Charge 3 and Polar A370 both get rid of removable battery and upgrade to a rechargeable battery to catch up with the market. They also have a battery level indicator to report current capacity. Yet Fitbit Charge 3 and Polar A370 still bundle themselves with wired charging and use conventional sources of power. However, battery life is where Fitbit Charge 3 dominates its rival in the competition, in which the stamina is seven days of Fitbit Charge 3 and just four days of Polar A370.

In this round, Fitbit Charge 3 wins in the most important category of the battery, make it a compelling success against Polar A370.


Criteria           Fitbit Charge 3Polar A370
Phone locatingNoNo
Call controlNoNo
Silent alarmYesYes
Vibrating alertsYesYes
Integrates with social networksYesYes
Inactivity alertsYesYes
Achievement trackingYesYes
Access to online servicesYesYes
Social featuresNoNo
Exercise diaryYesYes
IOS App size14MB151.9MB
Syncs to the cloudYesYes
Free AD-free appYesYes
Compatible with external heart rate monitorsYesYes
Music playbackYesNo
Voice feedbackNoYes
Designed for womenYesNo
Ovulation predictionYesNo
Period notificationsYesNo
Smart scale compatibleYesNo
Languages supported919
Start date predictionYesNo
Warranty period1 year2 years
Built-in camera remote control functionYesNo
Barcode scanner on appYesNo

Turning to their features, Fitbit Charge 3 and Polar A370 are quite competent in this category. Notification, silent alarm, stopwatch, vibrating alerts, achievement tracking, exercise diary, external heart rate monitors all are offered sufficiently to both products, make them more versatile in their functions. Fitbit Charge 3 and Polar A370 come with an AD-free app with the ability to connect with online services and social networks. Sadly users can not approach the community because of the absence of social features. They are quite isolated from the Phone as well, as they don’t have phone locating and call control features.

The difference is, Fitbit Charge 3 pays much more attention to woman users, as it has the feature designed solely to women such as exercises, ovulation predictions, so on.

Apart from the lack of voice feedback, which does not matter much to the user, Fitbit Charge 3’s features are all about efficiency: music playback, period notifications, smart scale compatibility, start date prediction, built-in camera remote control function, barcode scanner, which Polar A370 does not possess.

Fitbit Charge 3’s app also occupies less space than Polar A370, which is 14MB and 151.9MB, respectively. One thing that could bring Polar in-line with the competition is the warranty policy. Polar give their products the warranty period up to 2 years, while it is just one year of Fitbit.

Conclusion: Fitbit Charge 3 vs. Polar A370 – Which One Should You Buy?

At the bottom line, to compete with Fitbit’s flagship is quite hard with all the reputation it has, but Polar A370 still does an outstanding job even it is inferior to Fitbit Charge 3. Fitbit Charge 3 holds all the wins for an AMOLED touchscreen design, for more data it provides to all the extra features it possesses and so on. If you need a long period of warranty, you will probably choose Polar A370. Otherwise, Fitbit Charge 3 is the best for you in all aspects.