Product Comparison

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Forerunner® 645
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Print Remove this device from comparison.
Forerunner® 645
$399.99 USD
Buy Now
Remove this device from comparison.
vívoactive® 3
$269.99 USD and Up
Buy Now
Remove this device from comparison.
Forerunner® 935
$449.99 USD and Up
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GPS running watch with Garmin Pay™ contactless payments and wrist-based heart rate

GPS smartwatch with built-in sports apps, Garmin Pay™ contactless payments and wrist-based heart rate

Premium GPS running/triathlon watch with wrist-based heart rate

General

Lens Material

chemically strengthened glass

chemically strengthened glass

chemically strengthened glass

Bezel Material

stainless steel

stainless steel

fiber-reinforced polymer

Case material fiber-reinforced polymer with stainless steel rear cover fiber-reinforced polymer
QuickFit™ watch band compatible

yes (22 mm)

Quick Release Bands yes (20 mm, Industry standard) yes (20 mm, Industry standard)
Strap material

silicone

silicone

silicone

Physical size

42.5 x 42.5 x 13.5 mm

Fits wrists with a circumference of 127-204 mm

43.4 x 43.4 x 11.7 mm

Fits wrists with a circumference of 127-204 mm

47 x 47 x 13.9 mm

Weight

41.8 g

43.0 g

49 g

Water rating 5 ATM Swim, 5 ATM 5 ATM
Touchscreen
Display type sunlight-visible, transflective memory-in-pixel (MIP) sunlight-visible, transflective memory-in-pixel (MIP) sunlight-visible, transflective memory-in-pixel (MIP)
Display size 1.2" (30.4 mm) diameter 1.2" (30.4mm) diameter 1.2" (30.4 mm) diameter
Display resolution 240 x 240 pixels 240 x 240 pixels 240 x 240 pixels
Color display
Battery life Smartwatch Mode: Up to 7 days
GPS mode: Up to 14 hours
GPS mode: Up to 13 hours
Smartwatch mode: Up to 7 days
Smartwatch Mode: Up to 2 weeks
GPS/HR mode: Up to 24 hours
UltraTrac™ mode: Up to 60 hours without wrist heart rate
Memory/History 200 hours of activity data 7 timed activities, 14 days of activity tracking data 64 MB

Clock Features

Time/date
GPS Time Sync
Automatic daylight saving time
Alarm clock
Timer
Stopwatch
Sunrise/sunset times

Sensors

GPS
GLONASS
Garmin Elevate™ wrist heart rate monitor
Barometric altimeter
Compass
Gyroscope
Accelerometer
Thermometer

Daily Smart Features

Connectivity Bluetooth®, ANT+®, Wi-Fi® Bluetooth® Smart and ANT+® Bluetooth® Smart, ANT+®, Wi-Fi®
Connect IQ™ (downloadable watch faces, data fields, widgets and apps)
Smart notifications
Text response/reject phone call with text (Android™ only)
Calendar
Weather
Controls smartphone music
Find My Phone
Find My Watch
VIRB® Camera Remote
Smartphone compatibility iPhone® and Android™ iPhone®, Android™ iPhone®, Android™
Compatible with Garmin Connect™ Mobile
Garmin Pay™

Activity Tracking Features

Step counter
Move bar (displays on device after a period of inactivity; walk for a couple of minutes to reset it)
Auto goal (learns your activity level and assigns a daily step goal)
Sleep monitoring (monitors total sleep and periods of movement or restful sleep)
Calories burned
Floors climbed
Distance traveled
Intensity minutes
TrueUp™
Move IQ™
Fitness Age yes (in app) yes (in app) yes (in app)

Fitness Equipment/Gym

Preloaded gym activity profiles Strength Training, Cardio Training, Elliptical Training, Stair Stepping, Floor Climbing, Indoor Rowing and Yoga Strength Training, Cardio Training, Elliptical Training, Stair Stepping, Floor Climbing, Indoor Rowing and Yoga Indoor Rowing, Strength Training and Cardio Training
Cardio workouts
Strength workouts
Automatic rep counting

Training, Planning and Analysis Features

GPS speed and distance
Customizable data pages
Customizable activity profiles
Auto Pause®
Interval training
Advanced workouts
Downloadable training plans
Auto Lap®
Manual lap
Configurable lap alerts
V02 max
Training Status (lets you see if you’re training effectively by tracking your training history and fitness level trend.)
Training Load (your total training load for the last 7 days calculated from estimated EPOC)
Training Effect (aerobic)
Training Effect (anaerobic)
Customizable alerts
Audio prompts
Finish time
Virtual Partner
Race an Activity
Auto multisport activities
Manual multisport activities
Course guidance
Segments (Live, Garmin)
Strava features (Beacon, live segments)
LiveTrack
Group LiveTrack
Touch and/or button lock
Hot keys
Auto scroll
Activity history on watch

Heart Rate Features

HR zones
HR alerts
HR calories
% HR max
% HRR
Recovery time
Auto max HR
HRV stress test (measures your heart rate variability while standing still, for 3 minutes, to provide you with an estimated stress level; the scale of this is 1 to 100; low scores indicate lower stress levels) yes (with compatible accessory)
Records heart rate while swimming yes (with HRM-Tri™ and HRM-Swim™)
HR Broadcast (broadcasts HR data over ANT+™ to paired devices)

Running Features

Preloaded run profiles

Running, Treadmill Running, Indoor Track

Running, Indoor Track Running, Treadmill Running

Running, Indoor Running, Trail Running

GPS-based distance, time and pace
Running dynamics yes (with compatible accessory)
Vertical oscillation and ratio (the degree of 'bounce' in your running motion and the cost-benefit ratio with stride length) yes (with compatible accessory)
Ground contact time and balance (shows how much time, in the running motion, your foot is on the ground rather than in flight and lets you check your running symmetry) yes (with compatible accessory)
Stride length (real time) yes (with compatible accessory)
Cadence (provides real-time number of steps per minute)
Performance condition (after running 6–20 minutes, compares your real-time condition to your average fitness level)
Lactate threshold (through analysis of your pace and heart rate, estimates the point where your muscles start to rapidly fatigue) yes (with compatible accessory)
Run workouts
Race predictor
Foot pod capable

Golfing Features

Yardage to F/M/B (distance to front, middle and back of green)
Yardage to layups/doglegs
Measures shot distance (calculates exact yardage for shots from anywhere on course) Automatic Automatic
Digital scorecard
Stat tracking (strokes, putts per round, greens and fairways hit)
Garmin AutoShot™
Green View with manual pin position
Hazards and course targets
PinPointer
TruSwing™ compatible
Round timer/odometer

Outdoor Recreation Features

Preloaded outdoor recreation profiles

Skiing, Snowboarding, XC Skiing, Stand up Paddleboarding, Rowing

Skiing, Snowboarding, XC Skiing, Stand Up Paddleboarding, Rowing

Hiking, Climbing, Skiing, Snowboarding, XC Skiing, Stand Up Paddleboarding, Rowing, Jumpmaster, Tactical

Point-to-point navigation
Bread crumb trail in real time
Back to start
TracBack®
UltraTrac mode
Elevation profile
Distance to destination
Barometric trend indicator with Storm Alert
Trail run auto climb
Vertical speed
Total ascent/descent
Compatible with BaseCamp™
GPS coordinates
Projected waypoint
Sight 'N Go
Area calculation yes (via Connect IQ™)
Hunt/fish calendar yes (via Connect IQ™)
Sun and moon information yes (via Connect IQ™)
Dual grid coordinates

Cycling Features

Preloaded cycling profiles

Biking, Indoor Biking

Biking, Indoor Biking

Biking, Indoor Biking, Mountain Biking

Courses
Bike lap and lap maximum power (with power sensor)
Race an activity
Time/distance alerts (triggers alarm when you reach goal)
FTP (Functional Threshold Power) yes (with compatible accessory)
Compatible with Vector™ (power meter)
Power meter compatible (displays power data from compatible third-party ANT+™-enabled power meters)
Compatible with Varia Vision™ (head-mounted display)
Compatible with Varia™ radar (rear-facing radar)
Compatible with Varia™ lights
Speed and cadence sensor support (with sensor)

yes (ANT+® and Bluetooth® Smart)

yes

yes (ANT+® and Bluetooth® Smart sensors)

Swimming Features

Preloaded swim profiles

Pool Swimming

Pool Swimming

Pool Swimming, Open Water Swimming

Pool swim metrics (lengths, distance, pace, stroke count/rate, calories)
Stroke type detection (freestyle, backstroke, breaststroke, butterfly)
Swim efficiency (SWOLF)
Drill logging
Pool swim workouts
Open-water swim metrics (distance, pace, stroke count/rate, stroke distance, calories)
Heart rate (real-time during rests, interval and session stats during rests, and automatic heart rate download post-swim) yes (with HRM-Tri™ and HRM-Swim™)
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