When comparing Garmin Vivofit 3 vs Polar M400, the Slant community recommends Polar M400 for most people. In the question“What are the best fitness trackers?” Polar M400 is ranked 4th while Garmin Vivofit 3 is ranked 24th. The most important reason people chose Polar M400 is:
The "Sport Profile" feature allows you to customize what stats you want to see for each type of exercise. For example, you may want the GPS on for running but not for a circuit workout. These preset profiles save you from having to set up the device each time you exercise.
Specs
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Pros
Pro Completely safe for swimming and showering
The Vivofit 3 is waterproof up to 50 meters. You can confidently take it swimming, or wear it in the shower without risk of damaging the tracker.
Pro No need to recharge the tracker
The Vivofit 3 runs on battery so there is no need to worry about keeping it charged.
With a battery life of up to 1 year, it can go longer without a battery change than most other fitness trackers.
Pro Gives you a lot of options for customizing different types of workouts
The "Sport Profile" feature allows you to customize what stats you want to see for each type of exercise. For example, you may want the GPS on for running but not for a circuit workout. These preset profiles save you from having to set up the device each time you exercise.
Pro Gives you custom activity goals suitable for your level
The daily activity goal is a good way to find out how active you really are in your everyday life. Here you can choose your typical activity level from three options and see how active you need to be to reach your daily activity goal.
The time you need to complete your daily activity goal depends on the level you have chosen and the intensity of your activities. Age and gender also affect the intensity you need to reach your daily activity goal.
Pro Detailed reports
The fitness tracker offers excellent reporting including distance, speed, cadence, heart rate (if paired with monitor), ascent, decent, calories, recovery status, and more.
Pro Ability to add training notes
The app allows you to add additional notes to your workouts for better tracking.
Cons
Con Too unreliable for the cost
The Vivofit 3 has multiple serious issues impacting its reliability which means you're taking a gamble by purchasing it. At $80, you can get trackers with much better build qualities and a similar set of features.
Con Software that detects different activity often doesn't work
The "Move IQ" software in the tracker, which is supposed to detect different types of exercise, often doesn't work. Either it will track everything as walking, or will not start tracking them all.
Con It's easy to lose the watch because of the weak clasp
The clasp frequently comes undone during physical activity because of its poor design. If you aren't constantly paying attention to it or add re-enforcement to the clip, it would be easy to lose the tracker.
Con Syncs with a limited number of devices
Con Not for people with small wrists
The tracker is available in two sizes, regular or extra large. The regular band is too long for people with below average sized wrists.
Con Sleep tracking lacks detail and accuracy
If you are awake for an extended period of time in the middle of the night and then fall back asleep, the fitness tracker may not see the additional hours as part of your sleep.
Con Unattractive and bulky design
The tracker is quite wide and hard to miss, it's not something that can blend in with what you're wearing outside of sport/exercise type settings.
Con Short battery life when using the GPS
With the GPS turned on, battery life goes from around 24 days to 9 hours.
This is likely fine for people who will always have opportunities to charge it after their run. However for anyone hoping to use the GPS for longer activities, such as hiking, that may not be long enough to be useful.
