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Apple or Android both has Fitbit app. You dont necessarily need the app for the watch and you dont necessarily need a watch to use the app. The app has a lot of good features and I recommend downloading it whether you buy a watch or not. I use it a lot for tracking my daily hydration.
Sorry, there was a problem. Please try again later.If its like my Charge 5 Fitbit, when traveling out of your time zone, you need the app to sync it and get it to the correct time in the new zone.
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