Question: what is the difference between alta hr and charge 3?
Answer: The Fitbit Charge 3 has a touchscreen interface and a display made of Corning Gorilla Glass 3, making it more durable and less susceptible to scratches than the Alta HR. Neither have a color display, but the Charge 3 does have a grayscale display compared to the purely black and white display of the Fitbit Alta HR.