So what do you get for the more expensive Charge 4?įirstly, it has GPS built in so it will track outdoor runs and cycles. However, as we’ll outline below, only the Charge 4 will monitor Estimated Oxygen Variation.īoth devices will also estimate Cardio Fitness Score, which is Fitbit’s name for VO2 Max. Largely these are just time, duration, heart rate and calories, but it does mean the exercise type will be logged in the Fitbit app.īoth devices will auto-detect some forms of exercise too – including outdoor walks.īoth devices use Fitbit’s top-level sleep tracking, and you get Sleep Score as well as the monitoring of sleep stages, such as deep, REM and light sleep. Tracker top picks: Amazfit Band 5 v Fitbit Charge 4īoth devices feature workout tracking, and can be manually set to capture a particular type of exercise. Accruing an Active Zone Minute is tougher on the Charge 4 but better suited for ensuring you’re getting the WHO’s recommended 150 minutes a week. Active Zone Minutes require you to elevate your heart rate into the Fat Burn zone – and you get double credit for time in Cardio or Peak zones. The main difference here is that the Fitbit Inspire HR tracks active minutes while the Charge 4 has change to track Active Zone Minutes – a new metric. However, only the Charge 4 will track floors climbed. The feature sets across the two devices are actually a lot more similar than many realise – and this means that many people would actually be equally well served by the cheaper Inspire HR.īoth devices track steps, sleep and 24/7 heart rate – which feeds into the logging of resting heart rate. 1 inch x 0.6 inch grayscale touchscreen OLEDĬharge 4 vs Inspire HR: Fitness/activity features.Up to seven days, 5 hours continuous GPS use.That also feeds into things like workouts, where the Charge 4 will show live stats from sessions – while you get minimal feedback from the Inspire HR.īoth devices feature hot-swappable bands and there are plenty of third party Fitbit straps out there to choose from – and plenty on the Fitbit Store.
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