Fitbit Charge 6 vs Whoop 4

Fitbit Charge 6 vs Whoop 4.0: two distinct approaches to fitness tracking

The Fitbit Charge 6 and Whoop 4.0 are two very distinct devices in their approach to fitness and health tracking, both having successfully carved out a niche in the wearable tech realm. The Fitbit Charge 6 was launched in September 2023, succeeding the earlier release of the Whoop 4.0 in September 2021. However, don’t be misled by its earlier release date. As we note in our hands-on review, the Whoop has received several updates since then – keeping it very competitive.

Essential readingTop fitness trackers and health gadgets

Not sure which one of these is right for you? Read on to find out how they compare.

Key takeaways

The Fitbit Charge 6 and Whoop 4.0 provide contrasting user experiences. The Charge 6 is a multifunctional device that balances fitness tracking with everyday smartwatch features. It is great for the average user. In contrast, the Whoop 4.0 prioritizes in-depth health data, focusing particularly on recovery and sleep, and operates on a subscription-based model. It is for those serious about their athletic pursuits. Both devices are top of the line in their respective niches.

View on Whoop; View on Amazon (Fitbit Charge 6).

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Technical specs
Bottom line

Fitbit Charge 6 vs Whoop 4.0: Hardware

Look & feel

The Fitbit Charge 6 and Whoop 4.0, while both being fitness trackers, offer distinct experiences in terms of their look and feel, shaped by their design choices and functionalities.

Starting with their shape, both devices adopt a rectangular form, but with different stylistic executions. The Fitbit Charge 6 presents a more traditional fitness band appearance with its rectangular face and sleek design. This is complemented by a physical button that adds a tactile aspect to the user experience, making navigation and interaction more intuitive.

In contrast, the Whoop 4.0 opts for a minimalistic approach, eliminating any physical buttons and even forgoing a traditional display. This design choice emphasizes the Whoop 4.0’s focus on continuous health tracking without distractions. The lack of a display contributes to its low-profile design, making it comfortable for 24/7 wear, which is a key aspect of its functionality.

When it comes to build quality, the Fitbit Charge 6 boasts a case made of aerospace-grade aluminum and a display protected by Corning Gorilla Glass 3, ensuring durability and resistance to daily wear and tear. The Whoop 4.0, with its metal frame and plastic body, also offers a sturdy build, but with a different aesthetic appeal, focusing more on the functionality than the display features.

Something to note is wear options. The Fitbit Charge 6 can only sit on your wrist. However, Whoop is more versatile. You can wear it on your wrist, upper arm, or purchase accessories that allow you to position the device on other locations of your body. So you get more of a choice there.

Colour options, water resistance

Color options for both devices cater to different tastes. The Fitbit Charge 6 offers a range of colors including Obsidian, Porcelain, and Coral, providing users with choices that can match their personal style.

The Whoop 4.0 offers a variety of strap options including Black, Arctic Gold, Ivy Rhodium, and Onyx Rose Gold, allowing for personalization in terms of the band’s appearance. Plus there are garments that you can purchase with small pouches. Simply slot the main unit in and it will track from there.

In terms of water resistance, the Fitbit Charge 6 is rated at 5 ATM, indicating a high level of water resistance suitable for activities like swimming. The Whoop 4.0 is rated at IP 68, which also indicates adequate resistance to water and dust.

Sensor technology

The Fitbit Charge 6 is equipped with a versatile set of sensors, including a 3-axis accelerometer, an optical heart rate monitor, a Pulse Ox sensor for measuring blood oxygen levels, and multipurpose electrical sensors compatible with the ECG app and EDA Scan app. These sensors make the Charge 6 a comprehensive tool for tracking a wide range of health and fitness metrics.

In terms of connectivity, the Charge 6 stands out with its built-in GPS and Glonass capabilities, allowing for precise location tracking during outdoor activities without the need for a smartphone. This feature is particularly beneficial for runners and cyclists who wish to track their routes and performance accurately. Additionally, the Charge 6 includes NFC for contactless payments, adding a layer of convenience for transactions on the go. However, it does not support music storage, focusing more on health and fitness functionalities than multimedia.

On the other hand, the Whoop 4.0 has a more limited set of sensors. It includes a 3-axis accelerometer, a 3-axis gyroscope, an optical heart rate sensor, blood oxygen, and skin temperature sensors. These sensors work together to provide a detailed analysis of the wearer’s physical state, particularly focusing on recovery and sleep quality. They are known to have a very high sampling rate – which translates into more accurate data.

Unlike the Fitbit Charge 6, the Whoop 4.0 relies on connected GPS, which means it needs to pair with a smartphone for location tracking. This might be a limitation for users who prefer not to carry their phones during workouts. The Whoop 4.0 does not include NFC or music storage capabilities, as its primary focus is on health metrics and recovery analysis rather than typical smartwatch features.

Battery life

The Fitbit Charge 6 and Whoop 4.0 both offer commendable battery life, but with different approaches and capabilities. The Fitbit Charge 6 conjures up to 7 days of usage on a single charge. This longevity is reduced to about 5 hours when using the GPS feature, which is a significant consideration for users who frequently engage in outdoor activities requiring location tracking.

On the other hand, the Whoop 4.0 offers a battery life of 4-5 days. This slightly shorter battery life, as compared to the Charge 6, is balanced by the device’s unique on-wrist charging feature, allowing users to charge the device without taking it off, ensuring uninterrupted health monitoring.

Fitbit Charge 6 vs Whoop 4.0: Technical specs

Here’s a detailed tech specs comparison table for the Fitbit Charge 6 and Whoop 4.0:

Fitbit Charge 6
Whoop 4.0
Release Date
September 2023
September 2021
Case Material
Aerospace grade aluminum, Corning Gorilla Glass 3 display, anodized aluminum housing and buckle
Metal frame, plastic body
Number of Physical Buttons
36.78 x 23.1 x 11.2mm
38 x 25 x 12 mm
Display Type
260 x 170 pixels
Screen Size
1.04 inches
Weight (without strap)
37.6 grams
15 grams
3-axis accelerometer, Optical heart rate monitor, Pulse Ox, Multipurpose electrical sensors (ECG & EDA Scan apps), Ambient light sensor
3-axis accelerometer, 3-axis gyroscope, optical heart rate, blood oxygen, skin temperature
IP 68
GPS, Glonass
Connected GPS
Built-in Speaker
Music Storage
Bluetooth, WiFi
Cellular Connectivity
Battery Type
Li-po battery pack
Battery Life
Up to 7 days, or up to 5 hours with GPS
4-5 days
Operating System
Obsidian, Porcelain, Coral
Black, Arctic Gold, Ivy Rhodium, Onyx Rose Gold, and various strap options
Typical RRP
$160, optional premium subscription
Device is free, annual membership $240

Fitbit Charge 6 vs Whoop 4.0: Features

The Fitbit Charge 6 is a powerhouse of health and fitness tracking, equipped with a variety of sensors to monitor a wide range of metrics. It excels in providing detailed insights into heart rate, blood oxygen levels, and stress management, thanks to its ECG and EDA Scan apps compatibility. The inclusion of built-in GPS and Glonass in the Charge 6 allows for precise tracking of outdoor activities like running and cycling, offering users the freedom to explore without being tethered to their phones.

In contrast, the Whoop 4.0 focuses intensely on recovery and sleep analysis, setting it apart as a tool for optimizing physical performance and well-being. While it lacks a built-in GPS, relying instead on connected GPS for location tracking, its strength lies in its high-frequency data collection. The Whoop 4.0 continuously monitors vital health metrics, providing users with in-depth insights into their recovery, sleep quality, and readiness to perform. This focus on recovery metrics makes the Whoop 4.0 particularly appealing to professional athletes and those who prioritize performance optimization and injury prevention.

Smartwatch-type features

When it comes to smartwatch-type features, the Fitbit Charge 6 offers more in this area compared to the Whoop 4.0. The Charge 6 includes NFC for contactless payments, adding a layer of convenience for everyday transactions. It also integrates smart features like notifications and weather updates, making it a more versatile device for daily use. The Whoop 4.0, with its lack of a display and minimalistic design, steers clear of typical smartwatch functionalities, focusing solely on health and fitness tracking.

Whoop 4
Image source: Whoop

Fitbit Charge 6 vs Whoop 4.0: Price

Regarding pricing, the Fitbit Charge 6 and Whoop 4.0 adopt different models. The Charge 6 is priced at around $160, offering a one-time purchase for the device. In contrast, the Whoop 4.0 follows a subscription-based model, where the device is free, but users pay an annual membership fee of $240.

The Fitbit also has a subscription model – but this is optional as you get plenty without this. This subscription provides users with personalized insights, advanced sleep tracking analytics, guided programs, and over 200 workouts tailored to individual fitness levels and goals. Additionally, it offers wellness reports and mindfulness content to support overall well-being.

Fitbit Charge 6 vs Whoop 4.0: Final thoughts

In the Fitbit Charge 6 and Whoop 4.0, we see two distinct philosophies in fitness and health tracking. The Fitbit Charge 6 is a versatile device offering a blend of fitness tracking capabilities and smartwatch features. It stands out with its built-in GPS, NFC for contactless payments, and a variety of health sensors, making it a comprehensive choice for those after a feature-packed fitness band.

On the other hand, the Whoop 4.0 takes a very different approach. It’s a device focused primarily on health monitoring, especially recovery and sleep analysis, and is offered free with an annual membership fee of $240. This model appeals to users who are more interested in detailed health analytics and continuous monitoring, without the distractions of a traditional smartwatch.

View on Whoop; View on Amazon (Fitbit Charge 6).

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Marko Maslakovic

Marko founded Gadgets & Wearables in 2014, having worked for more than 15 years in the City of London’s financial district. Since then, he has led the company’s charge to become a leading information source on health and fitness gadgets and wearables.

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