Fitbit Flex 2 vs. Fitbit Charge 3

Flex 2
Charge 3
 FitbitFlex 2Buy NowFitbitCharge 3Buy Now

Basic Info

Suggested Price$100$150

Activity & Fitness

Cycling (Bicycling)


Duration5 days7 days


Windows Phonen/a
WindowsNot yet




Resolutionn/a66 x 18
Sizen/a.721 inches


Audio Speaker


Barometer or Altimeter
Ultraviolet Sensor
Water Resistance5 ATM5 ATM




Operating Systemn/aNA

Comparing Charge 3 and Flex 2

Fitbit has been a leading player in the wearables market by delivering high-quality fitness trackers and smartwatches that cater to multiple needs and preferences. The Fitbit Charge 3 and Flex 2 are prime examples of Fitbit’s commitment to helping users monitor their health and fitness. Both have their own unique set of features and functionalities, geared toward helping users set and achieve their fitness goals.

Choosing the right wearable is important as it can make a significant difference in one’s health and fitness journey. With several options available in the market, it’s essential to understand your requirements and preferences before making a purchase.

Fitbit has consistently innovated and strived towards excellence in the wearables market. Both Fitbit Charge 3 and Flex 2 are backed by brand reputation, delivering top-quality products that exude an air of professionalism and reliability.

This article aims to provide an in-depth comparison of Fitbit Charge 3 and Flex 2, delving into various aspects like design, build, features, and performance to help potential buyers make informed decisions. Let’s jump right in!

Design and Build

Fitbit Charge 3

Fitbit Charge 3 is built with premium materials like aerospace-grade aluminum, giving it a sleek and lightweight design. The tracker itself weighs 29g and boasts an OLED display with a resolution of 66 x 18. The touchscreen enables quick and easy navigation, while the screen size measures 0.721 inches - just perfect to view your fitness stats comfortably.

Fitbit Flex 2

Moving to the Fitbit Flex 2, the device has a minimalistic and simple design, forgoing the touchscreen in favor of an LED display. The Flex 2 weighs a mere 23.5g and features a removable tracker that can be placed in an assortment of bands or bangles if you wish to wear it as a fashion accessory.

Comparison of Design and Build Quality

In terms of design, the Charge 3 is more advanced with its touchscreen OLED display, whereas the Flex 2 embraces simplicity with an LED screen. Both devices share similarities in being lightweight and having water resistance up to 5 ATM, making them suitable for swimming. The Flex 2, however, may offer more customization options due to its removable tracker design.

Features and Functionality

Fitbit Charge 3

Operating on Fitbit’s proprietary OS, the Charge 3 is equipped with a variety of sensors such as an accelerometer, barometer, and altimeter. Its battery life lasts up to 7 days, ensuring uninterrupted monitoring of fitness activities. Charge 3 tracks various aspects like calories, cycling, distance, heart rate, oxygen levels, sleep, steps, and swimming. Additionally, it supports phone functions and displays emails, texts, and app notifications.

Fitbit Flex 2

On the other hand, the Flex 2 also runs on Fitbit’s proprietary OS, albeit with a smaller feature-set. It tracks calories, distance, steps, and sleep along with swim tracking, thanks to its 5 ATM water resistance. Its battery life stands at 5 days, with smartphone compatibility limited to Android, iOS, and Mac. Plainly put, the Flex 2 primarily functions as a tracker for basic activities rather than providing more advanced functionalities.

Comparison of Features and Performance

The Charge 3 undoubtedly has an upper hand with its wider array of features, including advanced sensors, heart and oxygen level tracking, phone functions, email and text notifications, and a longer battery life. The Flex 2 sticks to essentials, offering simpler tracking capabilities without diving deep into additional features. While Charge 3 caters to users seeking comprehensive tracking, the Flex 2 may entice those who prefer a no-frills design and functionality.

User Interface and User Experience

Fitbit Charge 3

Charge 3's OLED touchscreen display allows seamless navigation, and it supports apps and customization. With compatibility extending to Android, iOS, and Mac devices, it’s relatively easy to access your Fitbit data and interact with the tracker for meeting your fitness goals.

Fitbit Flex 2

Focusing on simplicity, the Flex 2's LED display serves the basic purpose of showing your daily progress with the absence of dedicated apps or customization options. It’s compatible with Android, iOS, and Mac but does not support Windows or additional app functions.

Comparison of User Interface and User Experience

While Charge 3 delivers an enhanced user experience with its touchscreen interface and access to apps, the Flex 2 caters to those who appreciate minimalism and simplicity. Ultimately, the choice lies in the user’s preference for a comprehensive interface or a basic one.

Price and Value

Fitbit Charge 3

Priced at $150, the Fitbit Charge 3 offers substantial value for money with its extensive features and comparatively longer battery life for a more comprehensive and immersive fitness tracking experience.

Fitbit Flex 2

The Fitbit Flex 2 is priced at $100, catering to budget-conscious buyers seeking a no-nonsense, straightforward fitness tracker without the need for additional bells and whistles.

Comparison of Price and Value

With a $50 price difference, the Charge 3's advantages lie in its advanced features, better user interface, and longer battery life, justifying the price as an attractive value proposition. The Flex 2 remains a viable choice for those seeking an affordable and essential fitness tracker.


The Fitbit Charge 3 and Flex 2 each cater to different user preferences and budgets. Charge 3 offers advanced tracking, a superior user interface, and more features, making it ideal for fitness enthusiasts who want to keep a close eye on their health metrics. Meanwhile, the Flex 2 is perfect for individuals who prefer basic tracking capabilities and appreciate its simpler, budget-friendly approach.

Frequently Asked Questions

Which Fitbit is better for tracking swimming activities?

Both Fitbit Charge 3 and Flex 2 are capable of tracking swimming activities, thanks to their 5 ATM water resistance rating.

Can Fitbit Charge 3 and Flex 2 connect to Windows devices?

While both Charge 3 and Flex 2 are compatible with Android, iOS, and Mac, the Fitbit Charge 3 does not yet support Windows devices. Meanwhile, the Flex 2 is compatible with Windows.

Are these Fitbits suitable for receiving notifications from a smartphone?

Fitbit Charge 3 allows users to receive notifications for calls, messages, and emails from a connected smartphone. However, the Fitbit Flex 2 is limited to phone and text notifications only.

How do I view my progress on Fitbit Flex 2?

Fitbit Flex 2 features an LED display that provides an overview of your daily progress. For more detailed information, you can sync your Flex 2 with the Fitbit app on your smartphone or computer.

Do these Fitbit devices have built-in GPS?

Neither Fitbit Charge 3 nor Flex 2 comes with built-in GPS capabilities. However, both can connect to your smartphone to access GPS information when needed.

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