Garmin Vivosmart 3Garmin Vivosport
Tech specs 
SizeWidth: 18.5 mm
Thickness: 9.8 mm
Length (small/medium): 197 mm
Length (large): 223 mm
Circumference (small/medium): 122-188 mm
Circumference (large): 148-215 mm
Width: 21.0 mm
Thickness: 10.9 mm
MaterialSiliconeCase material: fiber-reinforced polymer
Lens material: chemically strengthened glass
ChargingUSBUSB
BatteryLithium batteryRechargeable lithium-ion
Battery lifeUp to 5 daysGPS mode: Up to 8 hours
Smartwatch mode: Up to 7 days
Water-resistanceUp to 50 metres (5 ATM)Swim
WeightSmall/medium: 20.4 g; Large: 21.5 gSmall/medium: 24.1 g
Large: 27.0 g
Sensor3 axis-accelerometer, barometric altimeter, heart rate monitor, vibration alert, ambient light sensorGPS, barometric altimeter, compass, accelerometer, heart rate
DisplayOLEDsunlight-visible, transflective memory-in-pixel (MIP), 72 x 144 pixels
Screen size9.6 mm x 19.2 mm, 64 x 128 pixels9.7 mm x 19.3 mm
ColorsBlack, PurpleSlate, Limelight, Fuchsia Focus
OtherMEMORY: 7 timed activities, 14 days of activity tracking data
Activity tracking 
StepsYesYes
DistanceYesYes
Calories burnedYesYes
ActivityYesYes
FloorsYesYes
SleepYesYes
Heart rate24/7Yes
Vo2MaxYesYes
Stress & recoveryYesYes
UV exposure
Skin temperature
Galvanic skin response
Hydration level
Calorie intake
GPSYes
Running featuresAccelerometer (calculates distance for indoor workouts, without need for a foot pod), personal records.Preloaded running profiles, GPS based distance/time/pace
Swimming features
Other - stress monitoring
- automatic rep count in the gym
- Clock, music control, auto goal, move bar
- all day stress tracking
- gym workout tracking
- music control, find my phone, etc.
- Built in apps for running, cycling, cardio, walking, strength training, rep counting, stair-stepper.
Non-fitness functions 
Smartphone notificationsYesYes
On-board music storage
Connected pay
Links 
Affiliate link*Amazon | GarminAmazon | Garmin
Read moreArticleArticle
*Disclosure: We are a professional review site that receives a small commission from sales of certain items, but the price is the same for you. See our affiliate disclosure page for more details.
**All tech specs and images on this page come from manufacturers. These may change over time as manufacturers sometimes update their devices. While we cannot guarantee absolute accuracy of information on this page, we promise to review this content regularly and do our best to bring you the most up-to-date information. To be absolutely sure of tech specs of a particular device, we recommend checking the manufacturer’s website.