Product Comparison

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vívoactive® 3
$249.99 USD and Up
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Forerunner® 645
$399.99 USD

You need a simple, affordable GPS smartwatch that can keep up — work, errands, even sports — and puts music on your wrist.

You need a simple, affordable GPS smartwatch that can keep up with you — work, errands, even sports. This is just your style.

You're an athlete with style. This GPS running smartwatch is lightweight but heavy on features, including music on your wrist.

You're an athlete with some style. You want a GPS running smartwatch with a lightweight design and heavyweight features.

Maps & Memory

Lens Material

Corning® Gorilla® Glass 3

Corning® Gorilla® Glass 3

Corning® Gorilla® Glass 3

Corning® Gorilla® Glass 3

Bezel Material

stainless steel

stainless steel

stainless steel

Case material polymer fiber-reinforced polymer with stainless steel rear cover
Quick Release bands yes (20 mm, Industry standard) yes (20 mm, Industry standard) yes (20 mm, Industry standard) yes (20 mm, Industry standard)
Strap material

silicone

silicone

silicone

silicone

Physical size

43.1 x 43.1 x 13.6 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

42.5 x 42.5 x 13.5 mm

Fits wrists with a circumference of 127-204 mm

42.5 x 42.5 x 13.5 mm

Fits wrists with a circumference of 127-204 mm

Touchscreen
Color display
Display size 1.2" (30.4mm) diameter 1.2" (30.4mm) diameter 1.2" (30.4 mm) diameter 1.2" (30.4 mm) diameter
Display resolution 240 x 240 pixels 240 x 240 pixels 240 x 240 pixels 240 x 240 pixels
Display type sunlight-visible, transflective memory-in-pixel (MIP) sunlight-visible, transflective memory-in-pixel (MIP) sunlight-visible, transflective memory-in-pixel (MIP) sunlight-visible, transflective memory-in-pixel (MIP)
Weight

39.0 g

43.0 g

42.2 g

41.8 g

Battery life Smartwatch mode: Up to 7 days
GPS mode with music: Up to 5 hours
GPS mode without music: Up to 13 hours
Smartwatch mode: Up to 7 days
GPS mode: Up to 13 hours
Smartwatch Mode: Up to 7 days
GPS mode with music: Up to 5 hours
GPS mode without music: Up to 14 hours
Smartwatch Mode: Up to 7 days
GPS mode: Up to 14 hours
Water rating 5 ATM 5 ATM 5 ATM 5 ATM
Memory/History 7 timed activities, 14 days of activity tracking data 7 timed activities, 14 days of activity tracking data 200 hours of activity data 200 hours of activity data

Clock Features

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

Health Monitoring

Wrist-based Heart Rate (constant, every second)
Daily Resting Heart Rate
Abnormal Heart Rate Alerts yes (high) yes (high)
Fitness Age yes (in app) yes (in app) yes (in app) yes (in app)
All-day Stress
Relaxation breathing timer
Sleep yes (Advanced) yes (Advanced) yes (Advanced) yes (Advanced)
Hydration yes (in Garmin Connect™ and optional Connect IQ™ widget) yes (in Garmin Connect™ and optional Connect IQ™ widget) yes (in Garmin Connect™ and optional Connect IQ™ widget) yes (in Garmin Connect™ and optional Connect IQ™ widget)
Woman's Health yes (in Garmin Connect™ and optional Connect IQ™ widget) yes (in Garmin Connect™ and optional Connect IQ™ widget) yes (in Garmin Connect™ and optional Connect IQ™ widget) yes (in Garmin Connect™ and optional Connect IQ™ widget)

Sensors

GPS
GLONASS
Galileo
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®, ANT+®, Wi-Fi® Bluetooth®, 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
Plays and controls watch music
Music storage up to 500 songs up to 500 songs
Find My Phone
Find My Watch
VIRB® Remote
Smartphone compatibility iPhone®, Android™ iPhone®, Android™ iPhone® and Android™ iPhone® and Android™
Pairs with Garmin Connect™ Mobile
Garmin Pay™

Safety and Tracking Features

LiveTrack
Incident Detection during select activities
Assistance

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)
Calories burned
Floors climbed
Distance traveled
Intensity minutes
TrueUp™
Move IQ™
Garmin Connect™ Challenges app yes (optional Connect IQ app) yes (optional Connect IQ app) yes (optional Connect IQ app) yes (optional Connect IQ app)

Gym & Fitness Equipment

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

Training, Planning and Analysis Features

HR zones
HR alerts
HR calories
% HR max
% HRR
Recovery time
Auto max HR
HR Broadcast (broadcasts HR data over ANT+™ to paired devices)
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
VO2 Max (Run)
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
Training Effect (anaerobic)
Custom alerts
Audio prompts
Finish time
Virtual Partner
Race an Activity
Course guidance
Garmin Live Segments
Strava Live Segments
Touch and/or button lock
Auto scroll
Activity history on watch
Physio TrueUp

Running Features

Available run profiles

Running, Indoor Track Running, Treadmill Running

Running, Indoor Track Running, Treadmill Running

Running, Treadmill Running, Indoor Track, Trail Running

Running, Treadmill Running, Indoor Track, 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)
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
Round timer/odometer

Outdoor Recreation

Available outdoor recreation profiles

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

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

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

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

Point-to-point navigation
Bread crumb trail in real time
Back to start
TracBack®
UltraTrac mode
Elevation profile
Distance to destination
Vertical speed
Total ascent/descent
GPS coordinates
Area calculation yes (via Connect IQ™) yes (via Connect IQ™)
Hunt/fish calendar yes (via Connect IQ™) yes (via Connect IQ™)
Sun and moon information yes (via Connect IQ™) yes (via Connect IQ™)

Cycling Features

Alerts (triggers alarm when you reach goals including time, distance, heart rate or calories)
Courses
Available cycling profiles

Biking, Indoor Biking

Biking, Indoor Biking

Biking, Indoor Biking

Biking, Indoor Biking

Race an activity
Compatible with Varia Vision™ (head-mounted display)
Compatible with Varia™ radar (rear-facing radar)
Compatible with Varia™ lights
Speed and cadence sensor support (w/sensor)

Swimming Features

Available swim profiles

Pool Swimming

Pool Swimming

Pool Swimming

Pool Swimming

Pool swim metrics (lengths, distance, pace, stroke count, swim efficiency (SWOLF), calories)
Stroke type detection (freestyle, backstroke, breaststroke, butterfly) (pool swim only)
Drill logging (pool swim only)
Basic rest timer (up from 0) (pool swim only)
"Repeat on" rest timer (pool swim only)
Time and distance alerts
Countdown start (pool swim only)
Pool swim workouts

Kid Activity Tracking Features

Toe-to-Toe™ Challenges app yes (optional Connect IQ app) yes (optional Connect IQ app) yes (optional Connect IQ app) yes (optional Connect IQ app)