Best answer: Nope — anyone can step on the scale and it'll give you an accurate reading. If you want to keep track of your weight, you'll need the Fitbit app on your smartphone. To get the most out of the Aria, however, a Fitbit fitness tracker like the Versa connects with even more features.Best Smart Scale: Fitbit Aria 2 ($130 at Fitbit)Best for Weight Loss: Fitbit Versa (From $200 at Fitbit)The App You Need: Fitbit App (Free at the App Store)