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The vivofit jr. and vivofit 3 use different apps. The vivofit jr. pairs with the vivofit jr. app and the vivofit 3 will pair with the Garmin Connect Mobile app. While the devices do not directly pair with one app, you are still able to compete with your daughter and track steps. The vivofit jr. app has a Leaderboard that would show the number of steps taken by each device.