Fitbit likely a hot seller

NEW YORK (AP) - It was a very merry Christmas for fitness-tracking device maker Fitbit.

The company's app was the most downloaded on Apple's app store Christmas Day, a sign that many people couldn't wait to set up their Fitbit trackers after unwrapping them. It also suggests that Fitbit trackers were a hot seller during the holidays, despite increasing competition from Apple's smartwatch and other wearable devices. Investors were pleased, sending shares of the San Francisco company higher.

App Annie, which tracks app downloads and rankings, said the Fitbit app topped Apple's app store in the U.S. on Christmas and the day after.

Retailers confirmed Monday that Fitbit trackers were in high demand during the holiday shopping season.