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Wearable comparison

Google Fitbit Air vs Xiaomi Watch S4

Compare battery life, health tracking, display and fit.

Compared products
01Selected
Google Fitbit Air

Google Fitbit Air

  • Screenless tracker.
  • Up to 7 days.
  • Bluetooth 5.0.
  • Water resistant to 50 m.
  • Weighs 12 g.
KSh 20,000In Stock
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02
Xiaomi Watch S4

Xiaomi Watch S4

  • Screen: 466 × 466 pixels; 326 ppi.
  • Runs Xiaomi HyperOS 2.
  • Bluetooth 5.3 connection.
  • 486 mAh battery capacity.
  • 5 ATM.
KSh 21,940In Stock
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Huawei Watch GT 5KSh 21,500
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Apple Watch Series 8KSh 50,000
Apple Watch SE 2KSh 28,500
2 of 4 products

Our quick verdict

The Xiaomi Watch S4, a smartwatch with a 1.43-inch OLED screen, lasts longer between charges (15 days), has a sturdier aluminium build and syncs with apps such as Strava, while the Google Fitbit Air, a screenless tracker you read in the Google Health app, is lighter to wear all day.

Battery life

Google Fitbit Air
Up to 7 days
Xiaomi Watch S4
486 mAh battery

Portability

Google Fitbit Air
12 g
Xiaomi Watch S4
About 44.5 g

Display

Google Fitbit Air
Screenless tracker
Xiaomi Watch S4
1.43-inch OLED display, 60 Hz, 326 ppi

Software

Google Fitbit Air
Google Health
Xiaomi Watch S4
Xiaomi HyperOS 2

Connections

Google Fitbit Air
Bluetooth 5.0
Xiaomi Watch S4
Bluetooth 5.3

Key differences

The main differences to help you choose.

Google Fitbit Air

  • Lighter: 12 g (vs about 44.5 g).
  • Screenless: worn day and night, with results read in the Google Health app.
  • Slimmer: 8.3 mm thick (vs 12 mm).

Xiaomi Watch S4

  • Longer battery life: up to 15 days (vs 7).
  • Screen on the wrist for the time, notifications and workout stats.
  • Aluminium case (vs plastic case).
  • Syncs with third-party apps such as Strava and Apple Health.
  • Newer Bluetooth 5.3 (vs 5.0).

What matters most to you?

Choose any priorities

How each product answers the questions buyers ask most. Tick a topic to add it, untick one to hide it.

More topicsFewer topics
6 priorities selected.
How each product answers the selected priorities
PriorityGoogle Fitbit AirXiaomi Watch S4
Battery lifeUp to 7 days486 mAh battery
Portability12 gAbout 44.5 g
DisplayScreenless tracker1.43-inch OLED display, 60 Hz, 326 ppi
SoftwareGoogle HealthXiaomi HyperOS 2
ConnectionsBluetooth 5.0Bluetooth 5.3
Water resistanceWater resistant to 50 m5 ATM

Detailed comparison

Explore the full specifications, section by section.

Display

Display specifications comparison
SpecificationGoogle Fitbit AirXiaomi Watch S4
DisplayScreenless tracker1.43-inch AMOLED
Screen resolutionNot applicable466 × 466 pixels; 326 ppi
Display protection—Scratch/drop-proof glass
Display features—60 Hz refresh rate; up to 1,500 nits HBM

Connectivity

Connectivity specifications comparison
SpecificationGoogle Fitbit AirXiaomi Watch S4
BluetoothBluetooth LEBluetooth 5.3
Network / cellular—Phone network shared through Bluetooth (Android)
Wi-Fi—No
NFC—Supported (regional availability)
Positioning / GNSS—GPS; Galileo; GLONASS; BeiDou; QZSS

Identity & design

Identity & design specifications comparison
SpecificationGoogle Fitbit AirXiaomi Watch S4
BrandFitbitXiaomi
ModelGoogle Fitbit AirXiaomi Watch S4
Dimensions34.9 × 17 × 8.3 mm without band47.3 × 47.3 × 12.0 mm, excluding strap and protrusions
Weight5.2 g without band; 12 g with bandApproximately 44.5 g without strap
Build materialsRecycled polycarbonate; PBT plasticAluminum-alloy frame
Wrist sizeTextile: 130–210 mm; silicone small: 130–175 mm; silicone large: 165–210 mm140–210 mm (black, silver); 135–210 mm (rainbow)
Strap / bandTextile band with stainless-steel buckle; optional silicone bandsFluororubber; additional nylon strap with rainbow version
Controls / buttonsScreenless tracker with vibration feedback and an LED status light; configuration and detailed results are managed in the Google Health app.Rotating crown and side button; touchscreen
Announced—2024, October 29

Sensors, health & fitness

Sensors, health & fitness specifications comparison
SpecificationGoogle Fitbit AirXiaomi Watch S4
SensorsOptical heart-rate sensor; red and infrared SpO₂ sensors; temperature sensor; 3-axis accelerometer; gyroscopeHeart-rate and blood-oxygen sensor; accelerometer; gyroscope; ambient-light sensor; electronic compass; barometer; Hall sensor
Health & wellness featuresHeart rate; blood oxygen; skin-temperature variation; activity trackingHeart rate; blood oxygen; stress monitoring
Sleep trackingSleep stages; sleep scoreSleep tracking
Sports / workout modesAutomatic detection for walking, running, cycling, sports, elliptical, rowing machine and stationary bike; manual and app-started workout tracking is also supported.150+ sports modes
Training & outdoor featuresLive heart-rate broadcast to compatible gym equipment, Cardio Load, Active Zone Minutes, phone-connected GPS and post-workout pace and heart-rate zones in Workout Intensity Map.Running-form metrics; professional skiing mode; outdoor routes; running courses
Safety & emergency features—Skiing fall detection and emergency-contact calling with a connected smartphone

Battery & durability

Battery & durability specifications comparison
SpecificationGoogle Fitbit AirXiaomi Watch S4
Battery lifeUp to 7 daysUp to 15 days typical use
ChargingUSB-C charging cable2-pin magnetic charging dock
Water resistanceWater resistant to 50 m5 ATM
Battery capacity—486 mAh

Compatibility

Compatibility specifications comparison
SpecificationGoogle Fitbit AirXiaomi Watch S4
Phone compatibilityAndroid 11 or later; iOS 16.4 or later; Google AccountAndroid 8.0 or later; iOS 14.0 or later
Companion appGoogle HealthMi Fitness
ColorsObsidian; Berry; Lavender; FogBlack, Silver, Rainbow

Additional specifications

Additional specifications specifications comparison
SpecificationGoogle Fitbit AirXiaomi Watch S4
Vibration motorVibration motor—
Charging time90 minutes; 5-minute charge for 1 day—
Movement sensors3-axis accelerometer; gyroscope—
Bluetooth and Wi-FiBluetooth 5.0; Bluetooth LE sync—
Packing listTracker; wristband; USB-C charging cableWatch with bezel and strap; magnetic charging dock; user manual
strap materialTextile; stainless-steel buckle—
temperature monitoringSkin-temperature variation—
offline storage7 days of minute-by-minute motion data; 30 days of daily totals—
BluetoothBluetooth 5.0 BLE; syncing range up to 9 m; synchronization requires an internet connection and phone location permission.—
Positioning / GPSPhone-connected GPS through the Google Health app; Fitbit Air does not have built-in GPS.—
Health & wellness features24/7 heart rate, resting heart rate, heart-rate variability, breathing rate, blood oxygen (SpO2), skin-temperature variation, steps, distance, calories, Active Zone Minutes, Cardio Load and Readiness; Google Health also supports weight, nutrition, water, mood and cycle logging.—
Sleep trackingSleep Score, sleep schedule, sleep duration and sleep stages; Smart Wake uses sleep movement and heart rate to wake during a lighter sleep stage; adaptive sleep coaching requires Google Health Premium.—
Smart features / notificationsVibration and LED battery/status alerts, optional phone notifications, Fast Pair on Android and multi-device support with a compatible Pixel Watch.—
ChargingMagnetic USB-C charging cable; 0–100% in 90 minutes; a 5-minute quick charge provides up to one day of battery life.—
Strap / bandTextile and polyurethane band with stainless-steel buckle; silicone small and large bands are also supported.—
ColorsObsidian with Matte Black buckle; Berry with Polished Champagne Gold buckle; Lavender or Fog with Polished Silver buckle; Stephen Curry Rye/Pyrite and Pokémon Sleep Sleepy Blue special editions.—
Case material—Aluminum alloy
Watch weight without strap—Approximately 44.5g without strap
Display material—AMOLED
Pixels per inch—326 ppi
Peak brightness—1,500 nits HBM
Cover / touchscreen—Supported
Third-party fitness apps—Health Connect; Strava; Suunto synchronization
Release status—Available. Released 2024, October 29
Card slot—No
Camera—No
3.5 mm headphone jack—No
USB—No
Radio—No

Performance & software

Performance & software specifications comparison
SpecificationGoogle Fitbit AirXiaomi Watch S4
Operating system—Xiaomi HyperOS 2

Audio & communication

Audio & communication specifications comparison
SpecificationGoogle Fitbit AirXiaomi Watch S4
Speaker—Supported
Microphone—2 microphones
Calling—Bluetooth calling with a connected smartphone

Similarities

  • Both are water resistant to 50 m.
  • Both connect over Bluetooth.
  • Both go up to 210 mm (wrist size).

In summary

For most buyers the Xiaomi Watch S4 is the better buy; the Google Fitbit Air makes sense if you want a screenless tracker.

Back to compared products ↑

In-stock alternatives

Samsung Galaxy Watch FEFor Google Fitbit AirSamsung Galaxy Watch FEView product ↗Huawei Watch GT 5For Google Fitbit AirHuawei Watch GT 5View product ↗Amazfit Active 2 Premium RoundFor Xiaomi Watch S4Amazfit Active 2 Premium RoundView product ↗Huawei Watch Fit 4 ProFor Xiaomi Watch S4Huawei Watch Fit 4 ProView product ↗

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