Product Comparison: Garmin Forerunner 35 vs TomTom Spark 3 Cardio

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General Specifications
About the Product
Get fit with the Garmin Forerunner running watch. This running watch has a built-in GPS that tracks your run, including distance and speed, without requiring you to carry a phone. A wrist-based heart monitor in the Garmin Forerunner running watch records your heartbeat all day so you can easily monitor your fitness level.
A GPS Fitness Watch that gives you real-time metrics like your pace, distance, heart rate and speed at a glance to your wrist. Track your heart rate with a built-in 24/7 heart rate monitor. You can safely explore new trails with route exploration that will help you get back to the start. 24/7 Activity tracking and multisport functionality means you can capture every active minute of your day. Sprints, strolls, bikes, stairs, steps, swims. Every minute counts. See distance, calories burned, and steps throughout the day. Use the Fitness Age function to discover how fit you really are and how to get fitter faster. Know which activities matter most by earning Fitness Points with every workout. Coming soon, achieve your goals with over 50 personalized workouts on your watch, tailored to your fitness level. Battery life is up to 3 weeks in non-GPS mode and up to 9 hours with GPS on and heart rate on.
Forerunner 35
Spark 3 Cardio
Key Specs
Display Type
Monochrome LCD
Monochrome LCD
Display Size
0.93" x 0.93" (128 x 128 pixels)
0.87" x 0.98" (144 x 168 pixels)
Built-In GPS
Other Sensors
Garmin Elevate™ wrist heart rate monitor, Accelerometer
Accelerometer, Optical heart rate monitor, Compass, Gyro
What customers say about "Key Specs"
Garmin Forerunner 35 GPS Running Watch
  • I have had no problem whatsoever getting a GPS location - much quicker than my husband’s watch!
  • The watch tracks gps well and displays all the data you need it to.
  • I really liked this thing, I liked the size, I liked the battery life and I liked the 80's monochrome display.
  • It does what it says - not over complicated, easy to navigate, good for the everyday runner.
  • Sometimes it takes a short time to find satellites but still nice device.
TomTom Spark 3 Cardio GPS Fitness Watch + Heart Rate Monitor (Black, Small)
  • This watch’s heartbeat sensor is really accurate I have used it with a chest band and while holding the sensors on a treadmill and they all would read the same heart rate.
  • The GPS feature does take a little while to connect but once it connects I have never had it drop my GPS signal.
  • I have used the GPS feature on this a number of times and have really enjoyed the feature of it. Works very fast and occurate.
  • The Heart Rate monitor really is a great thing to have on your wrist.
  • It's effortless to jump in to the running screen, and the HRM seems pretty dang accurate. Love it!
Size & Weight
1.6 in.
1.14 in.
1.39 in.
0.98 in.
0.52 in.
0.54 in.
1.31 oz.
1.65 oz.
Tracking Features
Step counter, Move bar, Auto goal, Sleep monitoring, Calories burned, Distance, Intensity minutes, TrueUp™, Move IQ™
Calories burned, Distance, Steps, Active minutes, Sleep monitoring, Speed, Pace, Duration
Vibration Alerts
Clock Features
Time/date, Alarm, GPS Time Sync, Automatic daylight saving time, Stopwatch
Time/date, Alarm
7 activities
What customers say about "Functionality"
Garmin Forerunner 35 GPS Running Watch
  • Initially bought for the GPS functionality which is absolutely top notch. Tracked every run to great accuracy.
  • You can configure what it shows using the app on your phone like pace/speed, distance, time, calories burnt, etc. Nice and comfortable, recommended!
  • The vibration alerts enable you to track when a mile or km has passed which is better than just a beep as you can easily miss hearing it when you’re out and about running.
  • The alerts with vibration/beeps were useful at km intervals.
  • I can't hear the alerts and can barely feel the vibrations when running outside, so kept missing the interval alerts.
TomTom Spark 3 Cardio GPS Fitness Watch + Heart Rate Monitor (Black, Small)
  • The sleep monitoring on this watch is very nice, it will track when movement drops and then will track when you wake up and start moving.
  • The GPS portion when it works, works well and measures accurately and gives feedback about your speed by silently vibrating which I like.
  • Tracking so accurate, good device.
  • Alerts are very helpful and not annoying.
  • Tracking shows that I sleep 2 hours a night. How its possible?
USB / Bluetooth
Android, IOS
IOS, Android
Water rating - 5 ATM
Water rating - 5 ATM
Wristband Material
Battery Type
Rechargeable lithium-ion
Rechargeable lithium-ion
Battery Life
Smartwatch Mode: Up to 9 days ; GPS mode: Up to 13 hours
Activity tracking: up to 3 weeks, GPS: up to 11 hours, GPS + Heart Rate: up to 9 hours
Smart notifications, Find My Phone, LiveTrack, GPS speed and distance, Auto Pause®, Interval Training, Auto Lap®, Manual lap, V02 max, Audio prompts, Time/distance alerts
Multisport modes, Route exploration, Indoor training mode, Perfect fit, Customizable straps, Race Mode, Ultra-Slim Design, One-Button Control, 5 Heart rate training zones
What customers say about "Features"
Garmin Forerunner 35 GPS Running Watch
  • Coupled with the Garmin Connect App it gives a whole host of insightful stats and features and also syncs directly with my Strava profile.
  • A big plus is that the battery, even with 3-5 runs/rides a week typically lasts 5-7 days before a recharge is needed.
  • The strap was amazingly comfy much better than my fitbit.
  • Connecting to the Android app is simple and worthwhile.
  • I have no problems with battery life - lasts about 2 weeks on a charge, with 3 4 mile runs a week.
TomTom Spark 3 Cardio GPS Fitness Watch + Heart Rate Monitor (Black, Small)
  • The Battery life on this watch is great! I love the fact that I can go DAYS without charging this watch.
  • The longest I have gone without charging it is 7 days and I charged it not because it died but more because of the thought of needing to charge it.
  • I use the cycling mode while snowboarding and wow is it awesome! The gym mode is great!
  • I love that it's water proof, and it has a decent battery life.
  • Its really waterproof, i love it!
Warranty / Certifications
Manufacturer Warranty
2 year(s)
1 year(s)
Other Information

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