Fitbit Ace 3 vs Xiaomi Mi Band 6: Comparing Fitness Trackers for All Ages

In the world of kid-friendly activity trackers, the Fitbit Ace 3 and Xiaomi Mi Band 6 are two options that stand out for parents looking to encourage a healthy lifestyle for their children.

Having tested both devices, I note that they aim to make fitness fun for kids while giving parents peace of mind with their range of tracking features.

The Fitbit Ace 3 boasts a user-friendly interface and durability suitable for kids’ everyday activities, whereas the Xiaomi Mi Band 6 steps into the arena with its color display and additional health features.

During my time evaluating the two devices, I noticed the Ace 3’s narrower and shorter build, which may suit smaller wrists better.

The Mi Band 6, on the other hand, impressed me with its sleek design and seemed more aligned with adult fitness bands, possibly appealing to kids who want a more ‘grown-up’ feel.

When it’s about compatibility with other devices, the Ace 3’s seamless connection with the Fitbit ecosystem could be a deciding factor for those already invested in that platform.

Key Takeaways

  • Both the Fitbit Ace 3 and Xiaomi Mi Band 6 offer robust designs suitable for children’s activities.
  • Device compatibility and ecosystem are considerations; the Ace 3 integrates well with Fitbit’s existing platforms.
  • While design and tracking features are important, the value proposition can guide the choice between these two fitness trackers.

Design and Build Quality

In my hands-on experience, the Fitbit Ace 3 and the Xiaomi Mi Band 6 offer distinct design choices that cater to different user preferences. Both prioritize comfort and durability, but there are subtle differences in their build and display that merit a closer look.

Display Characteristics

The Fitbit Ace 3 features a simplistic design with a monochrome display that I found to be sufficient for its child-focused functionality. Despite its lack of color, the text and icons are clear, providing easy readouts at a glance. The Xiaomi Mi Band 6, on the other hand, boasts a vibrant 1.56-inch AMOLED full-color touchscreen, which I noticed offers a more engaging user experience.

  • Fitbit Ace 3
    • Display Type: Monochrome
    • Touchscreen: Yes
  • Xiaomi Mi Band 6
    • Display Type: AMOLED
    • Full-Color Display: Yes
    • Touchscreen: Yes

Comfort and Durability

Regarding comfort, both the Fitbit Ace 3 and Xiaomi Mi Band 6 are designed to be lightweight and easy to wear all day. I wore them for extended periods without any discomfort. The bands on each are made of soft silicone that is gentle on the skin.

In terms of durability, both fitness trackers are water-resistant, making them adequate for everyday wear including activities like swimming. The Ace 3 boasts a water resistance rating, making it durable enough for the kind of wear and tear children might put it through. Although I couldn’t verify the exact Gorilla Glass version on the Xiaomi Mi Band 6, its screen was not easily scratched during my daily use, suggesting there’s some form of damage-resistant glass.

  • Fitbit Ace 3
    • Water-resistant
    • Designed for kids’ daily activities
  • Xiaomi Mi Band 6
    • Water-resistant
    • Screen: Likely damage-resistant glass

Both the Ace 3 and Mi Band 6 are well-built and offer durable designs that stood up to the rigors of my daily activities, whether it’s working out or just going about my day.

Health and Fitness Tracking Features

In my exploration of the Fitbit Ace 3 and Xiaomi Mi Band 6, I’ve unearthed a variety of health and fitness tracking functionalities that cater to the everyday user. Each device is equipped with an array of sensors to monitor a range of physical activities and health indicators.

Core Health Monitoring

Fitbit Ace 3

  • Heart Rate Monitor: Not available; focuses on activity tracking suitable for children.
  • Sleep Tracking: Yes, it tracks the sleep pattern to help understand sleep quality.
  • Sensors: Features an accelerometer for movement tracking.

Xiaomi Mi Band 6

  • Heart Rate Monitor: Equipped with a PPG heart rate sensor that provides continuous heart rate tracking.
  • Sleep Tracking: Offers comprehensive sleep monitoring, including REM sleep stages.
  • Sensors: 6-axis sensor that includes an accelerometer and a gyroscope, enhancing movement detection accuracy.
  • Blood Oxygen Level: Yes, it can measure SpO2, providing insights into blood oxygen saturation—a key health metric.

Advanced Fitness Functions

Fitbit Ace 3

  • I found the device’s main focus is on providing fun incentives to keep kids moving, so it doesn’t delve deeply into advanced fitness metrics.

Xiaomi Mi Band 6

  • Multi-Sport Mode: Supports up to 30 workout types, allowing me to switch between sports, capturing specific activity data.
  • Advanced Tracking: The band’s 6-axis sensor enables precise tracking for different forms of exercise and can automatically recognize six workout modes for my convenience.

Software and Ecosystem Compatibility

In my experience testing both the Fitbit Ace 3 and Xiaomi Mi Band 6, a crucial aspect of a fitness tracker’s value lies in its software capabilities and ecosystem compatibility. These devices are not solitary gadgets; their full potential unfolds once synced with their companion apps, delivering a seamless experience across various smartphone platforms.

Smartphone Integration

When I paired these devices with smartphones, I noted the Fitbit Ace 3 offers robust iOS and Android compatibility, sending notifications directly to the wrist. While it lacks NFC capabilities for payments, its robust Bluetooth connection ensures a steady stream of updates and data syncs to the Fitbit app. The Xiaomi Mi Band 6, in comparison, also integrates well with both iOS and Android platforms, though the binding with iOS can occasionally be less straightforward than with Android devices. Notifications and weather updates are smoothly relayed to the band, ensuring you’re always in the loop.


  • Fitbit Ace 3
    • Supports call, text, and app notifications
    • Doesn’t support NFC for payments
  • Xiaomi Mi Band 6
    • Supports call, text, and app notifications
    • No NFC feature available

Companion Apps and Customization

The companion apps are where both devices shine, allowing me to delve deep into my fitness metrics and customize the experience. The Fitbit app distinguishes itself with its user-friendly interface and community features. I found customizing the watch face and setting up exercise goals to be intuitive. You won’t find direct Google Maps integration, but its smart features are comprehensive enough for everyday needs.

In contrast, the Mi Fit app for the Xiaomi Mi Band 6 includes a range of customization options for the band’s display and settings. While it provides essential functions and customization, in my experience, the app’s interface and user experience do not quite match the polish of the Fitbit ecosystem.

Companion App

  • Fitbit Ace 3
    • Fitbit app used for data syncing and social features
    • Offers extensive customization options
  • Xiaomi Mi Band 6
    • Mi Fit app used for basic settings adjustments and data review
    • Provides essential customization features


  • Fitbit Ace 3
    • Broad selection of watch faces
    • Exercise goals easily set and tracked
  • Xiaomi Mi Band 6
    • Customizable band displays
    • Functional but less expansive customization suite

Both the Fitbit Ace 3 and the Xiaomi Mi Band 6 possess unique strengths in their respective ecosystems, but the cohesive and comprehensive nature of the Fitbit software experience gives it an edge, especially for users who value ease of integration and a polished app environment.

Battery and Connectivity

Having tested the Fitbit Ace 3 and the Xiaomi Mi Band 6, the key differences in battery performance and connectivity are quite telling in their usage. Each tracker caters to a different audience’s needs, and these nuances are important in understanding their overall value proposition.

Battery Performance

In my experience, the Fitbit Ace 3 tends to have a robust battery life. I could use it comfortably for about eight days without needing to charge it. The device lacks GPS, which likely contributes to this prolonged battery longevity. The Xiaomi Mi Band 6, however, offers an impressive 14 days of battery life under normal use. Although, with features like the heart rate monitor used frequently, the battery life can be expected to decrease.

  • Fitbit Ace 3 Battery Life: ~8 days
  • Xiaomi Mi Band 6 Battery Life: Up to 14 days

Neither of these devices includes a power save mode or solar battery, but their battery performance is optimized effectively for routine usage without those features.

Wireless Technologies

The Fitbit Ace 3 and the Xiaomi Mi Smart Band 6 are both equipped with Bluetooth 5.0 technology which provides a stable and efficient connectivity range. I noticed that the pairing process with smartphones is quite seamless for both devices. They each lack Wi-Fi, cellular technology, ANT+, and Galileo, focusing instead on Bluetooth for their wireless connections.

While neither device supports wireless charging, I found the magnetic charging connectors to be easy and intuitive to use. Neither tracker had issues maintaining their connection for notifications, data syncs, or during the use of connected features during my tests.

  • Bluetooth Version: 5.0 for both devices
  • Wi-Fi: Not supported
  • Cellular Technology: Not supported
  • Wireless Charging: Not available

The deliberate absence of Wi-Fi and cellular technology doesn’t detract from the user experience, as the Bluetooth connectivity offers sufficient distance and stability for daily activities.

Price and Value Proposition

When evaluating the Fitbit Ace 3 and the Xiaomi Mi Smart Band 6, I’ve taken into account not just their price tags but also what each offers for the money. It’s crucial to balance affordability against the features and user satisfaction each device provides.

Comparative Costs

DeviceFitbit Ace 3Xiaomi Mi Smart Band 6

* price may vary based on retailer and region

From my assessment, the Fitbit Ace 3 comes in at a higher price point than the Xiaomi Mi Smart Band 6. The Fitbit Ace 3 is positioned in the market as a more premium option within the children’s fitness tracker segment, which can be justified by its tailored design for a younger audience and parent-approved controls. Meanwhile, the Xiaomi Mi Smart Band 6 is notably cheaper, making it a budget-friendly pick without a significant compromise on the feature set.

User Experience and Reviews

My investigations into user feedback reveal that the Fitbit Ace 3 is generally well-received for its simplistic design suitable for children and focus on essential fitness tracking. I find that the intuitive interface and the durable build resonate positively with parents looking for a reliable device for their children.

On the other hand, the Xiaomi Mi Smart Band 6 garners approvals for its value for money—it offers an array of features normally found in more expensive models. Reviewers often highlight the band’s comprehensive health and fitness tracking, along with its lightweight design, as significant advantages. However, it’s worth mentioning that while it’s affordable, it might not cater specifically to children like the Ace 3 does.


In my experience with both the Fitbit Ace 3 and the Xiaomi Mi Band 6, each has its strengths that cater to different user preferences. If we’re talking about brand reliability, Fitbit has consistently demonstrated a strong emphasis on health tracking. With its capability to monitor calorie and water intake, the Ace 3 has proven to be a valuable tool in managing daily health routines. On the flip side, Xiaomi is recognized for delivering affordable fitness trackers that offer a variety of features.

When it comes to sleep and workouts, both devices offer robust tracking. However, from my observations, the Ace 3 edges out slightly with more comprehensive sleep analysis, which can be pivotal for those who are monitoring their mental health closely. With regular exercise being a critical factor in mental wellness, the fitness tracking on these devices is more than adequate.

The Ace 3 has a slightly smaller screen size compared to the Mi Band 6, but the difference is negligible in daily use. Those with a preference for a more compact device might lean towards the Fitbit for its size.

Ultimately, my time with these trackers leads me to believe that your choice depends on your priorities. If broader health tracking and integration with the Fitbit ecosystem are important to you, along with compatibility with Mac OS X, the Fitbit Ace 3 is a compelling choice. Conversely, if budget is a primary concern and you still seek a feature-rich tracker, the Xiaomi Mi Band 6 presents itself as a very capable alternative.


  • Matthew

    Meet Matthew, a wearable tech & fitness enthusiast passionate about transforming health through innovative devices. With an engineering background and a love for fitness, Matthew shares in-depth reviews, tips, and news on the latest wearable tech to help you achieve your fitness goals.

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