Fitbit Charge 6 vs Sense 2 specs comparison

The Charge 6 is the better choice for most people. It is smaller, has slightly longer battery life, built-in GPS, ECG and useful Google features, while still covering most of the same everyday health and fitness tracking. Sense 2 makes more sense if you prefer a larger smartwatch-style display and want its stronger stress-tracking focus.

At a glance

What's different?

The strongest database-backed differences, without pretending every different number is an advantage.

Fitbit Charge 6

  • Much longer battery life 7 days vs 5 hours
  • Brighter display Up to 450 nits vs 000 nits
  • 20% lighter 30 g vs 37.64 g
  • Different material configuration Built of more lightweight material including an aerospace grade aluminum case and Corning Gorilla Glass 3 display. The housing and buckle are made of anodized aluminum

Fitbit Sense 2

  • Bluetooth calling Not available on the other model
  • Different material configuration Aluminum watch case and buckle; flexible sport-style band
  • Wi-Fi Not available on the other model
  • 52% larger display 1.58 in vs 1.04 in
  • 155% more display pixels 336 × 336 vs 260 × 170
Both include ECG, blood oxygen tracking, skin temperature tracking, HRV tracking.
Full comparison

The full record

81 specifications across 6 areas, with 22 genuine differences.

1. Design & display 10 differences · advantages split between the two Mixed
Fact
Fitbit Charge 6
Fitbit Sense 2
Release date
2023-10-12
2022-09-29
Physical size
36.73 x 23.09 x 11.20 mm
40.5 x 40.5 x 11.2 mm
Weight
30 g
37.64 g
Material
Built of more lightweight material including an aerospace grade aluminum case and Corning Gorilla Glass 3 display. The housing and buckle are made of anodized aluminum
Aluminum watch case and buckle; flexible sport-style band
Water resistance
5 ATM; IP68
5 ATM
Color options
Coral / Champagne Gold Aluminium, Porcelain / Silver Aluminium, Obsidian / Black Aluminium
Shadow Grey / Graphite Aluminum, Lunar White / Platinum Aluminum, Blue Mist / Soft Gold Aluminum
Display type
AMOLED touchscreen
AMOLED
Display size
1.04 inch
1.58 inch
Display resolution
260 x 170 pixels
336 x 336 pixels
Display brightness
Up to 450 nits
Up to 1, 000 nits
Display protection
Corning Gorilla Glass 3
Corning Gorilla Glass 3
2. Battery & charging 4 differences · Fitbit Charge 6 leads on Battery life Fitbit Charge 6
Fact
Fitbit Charge 6
Fitbit Sense 2
Battery
Rechargeable lithium-polymer battery; 65 mAh
Rechargeable lithium-polymer battery; 162 mAh
Battery life
Up to 7 days; up to 5 hours with GPS
6+ days; up to 5 hours with continuous GPS
Charging
USB charging cable
USB. Charge time (0-100%): 2 hours. 12 minutes to get one day of battery life
Charging time
About 2 hours to 100%
About 2 hours to 100%; 12 minutes for 1 day
3. Sensors & positioning 4 differences · Fitbit Sense 2 leads on Gyroscope, Barometric altimeter +2 Fitbit Sense 2
Fact
Fitbit Charge 6
Fitbit Sense 2
GNSS type
Built-in GNSS + connected GPS
Built-in GNSS + connected GPS
GPS
Yes
Yes
GALILEO
No
No
GLONASS
Yes
Yes
QZSS
No
No
Beidou
No
No
Accelerometer
Yes
Yes
Gyroscope
No
Yes
Barometric altimeter
No
Yes
Compass
No
No
Geomagnetic
No
No
Ambient light sensor
Yes
Yes
Optical heart rate
Yes
Yes
Electrical heart rate
Yes
Yes
SpO2
Yes
Yes
Temperature
Yes
Yes
Galvanic skin response
Yes
Yes
Microphone
No
Yes
Speakers
No
Yes
Vibration motor
Yes
Yes
4. Health & activity 1 difference · no clear overall edge No clear edge
Fact
Fitbit Charge 6
Fitbit Sense 2
Steps
Yes
Yes
Distance
Yes
Yes
Calories burned
Yes
Yes
Floors
No
Yes
Sports tracking
Yes (20 more than Charge 5)
40+ Goal-Based Exercise Modes
Sleep
Yes
Yes
Heart rate
Yes (High/low heart rate notifications and ECG app)
Yes
HRV
Yes
Yes
Stress
Yes
Yes
Blood oxygen
Yes
Yes
Respiration rate
Yes
Yes
Skin temperature
Yes
Yes
ECG
Yes
Yes
Blood pressure
No
No
Body composition
No
No
Glucose
No
No
Hydration level
No
No
UV exposure
No
No
Calorie intake
No
No
Daily Readiness
Yes
Yes
Cardio Load
Yes
Yes
Target Load
Yes
Yes
Hyperglycemia risk assessment
No
No
Arterial stiffness detection
No
No
Pulse wave arrhythmia analysis
Yes
Yes
5. Smart features 3 differences · no clear overall edge No clear edge
Fact
Fitbit Charge 6
Fitbit Sense 2
Smartphone compatibility
Android 11+; iOS 16.4+
Android 11+; iOS 16.4+
Operating system at launch
FitbitOS
FitbitOS
Data retention
7 days detailed data; 30 days daily totals
7 days detailed data; 30 days daily totals
Bluetooth
Yes
Yes
Wi-Fi
No
Present but deactivated; cannot be turned on
NFC / connected pay
Yes
Yes
UWB
No
No
Cellular
No
No
Smartphone notifications
Yes
Yes
Bluetooth calling
No
Yes
Smartphone music control
Yes (YouTube Music controls on paired phone; no offline playback)
Yes (YouTube Music controls on paired phone; no offline playback)
On-board music storage
No
No
Voice assistant
No
Amazon Alexa
6. Navigation & safety No significant differences Even
Fact
Fitbit Charge 6
Fitbit Sense 2
Maps
Google Maps directions
Google Maps directions
Offline maps
No
No
Navigation
Google Maps turn-by-turn directions
Google Maps turn-by-turn directions
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.

Individual specifications

These technical specs are correct to the best of our knowledge at the time of publishing.