Polar Loop vs Fitbit Air specs comparison
Fitbit Air is the better fit for passive health tracking, particularly with its lighter design, SpO2 and temperature sensors and expanding Google Health features. Polar Loop costs more but is the stronger fitness-focused option, particularly if you already use Polar Flow, and it has the major advantage of keeping its recovery and training insights subscription-free.
Full comparison
The full record
78 specifications across 6 areas, with 21 genuine differences.
1. Design & display No clear edge
Fact
Polar Loop
Fitbit Air
Release date
2025-09-10
2026-05-26
Physical size
27 x 42 x 9 mm
34.9 x 17 x 8.3 mm
Weight
29 g
5.2 g without band; 12 g with band
Material
Stainless steel, ABS+10%GT, PMMA
Housing: recycled polycarbonate and PBT plastics; textile band with stainless steel buckle
Water resistance
3 ATM
5 ATM; IP68
Color options
Night Black, Greige Sand, Brown Copper
Obsidian band / Matte Black stainless steel buckle, Berry band / Polished Champagne Gold stainless steel buckle, Lavender band / Polished Silver stainless steel buckle, Fog band / Polished Silver stainless steel buckle
Display type
None
None
Display size
None
None
Display resolution
None
None
Display brightness
None
None
Display protection
None
None
2. Battery & charging Polar Loop
Fact
Polar Loop
Fitbit Air
Battery
Rechargeable lithium-polymer battery; 170 mAh
Rechargeable lithium-polymer battery; 34.5 mAh
Battery life
Up to 8 days
Up to 7 days
Charging
Custom Polar USB cable
USB-C charging cable
3. Sensors & positioning Fitbit Air
Fact
Polar Loop
Fitbit Air
GNSS type
None
Connected GPS
GPS
No
Connected GPS
GALILEO
No
No
GLONASS
No
No
QZSS
No
No
Beidou
No
No
Accelerometer
Yes
Yes
Gyroscope
No
Yes
Barometric altimeter
No
No
Compass
No
No
Geomagnetic
No
No
Ambient light sensor
No
No
Optical heart rate
Yes
Yes
Electrical heart rate
No
No
SpO2
No
Yes
Temperature
Yes (skin temperature sensor; SDK only)
Yes
Galvanic skin response
No
No
Microphone
No
No
Speakers
No
No
Vibration motor
No
Yes
4. Health & activity Fitbit Air
Fact
Polar Loop
Fitbit Air
Steps
Yes
Yes
Distance
Yes
Yes
Calories burned
Yes
Yes
Floors
No
No
Sports tracking
Yes
Yes
Sleep
Yes
Yes
Heart rate
Yes
Yes
HRV
Yes (Nightly Recharge)
Yes
Stress
Yes (Nightly Recharge / ANS charge)
Yes
Blood oxygen
No
Yes
Respiration rate
Yes (during Nightly Recharge)
Yes
Skin temperature
Yes (GEN 1 sensor; SDK only)
Yes
ECG
No
No
Blood pressure
No
No
Body composition
No
No
Glucose
No
No
Hydration level
No
No
UV exposure
No
No
Calorie intake
No
No
Readiness / recovery
Nightly Recharge
Daily Readiness
Training load / strain
Training Load Pro (Polar Flow app)
Cardio Load
Hyperglycemia risk assessment
No
No
Arterial stiffness detection
No
No
Pulse wave arrhythmia analysis
No
Yes
5. Smart features No clear edge
Fact
Polar Loop
Fitbit Air
Smartphone compatibility
Android 8+ and iOS 17+
Android 11+; iOS 16.4+
Operating system at launch
Proprietary
FitbitOS
Bluetooth
Yes (5.1)
Yes (5.0)
Wi-Fi
No
No
NFC / connected pay
No
No
UWB
No
No
Cellular
No
No
Smartphone notifications
No
No
Bluetooth calling
No
No
Smartphone music control
No
No
On-board music storage
No
No
Voice assistant
No
No
6. Navigation & safety Even
Fact
Polar Loop
Fitbit Air
Maps
No
No
Offline maps
No
No
Navigation
No
No
Emergency SOS
No
No
Satellite SOS
No
No
Fall detection
No
No
LED flashlight
No
No
Diving
No
No
No significant differences in this area.