Enlarge (credit: Valentina Palladino) Withings has returned as its own company after a short stint under Nokia, and it's brought out some new fitness trackers to take on the top contenders. The $129 Withings Pulse HR looks and acts much like Fitbit's Alta HR: its svelte, rectangular module tracks heart rate all day and night as well as daily activity and workouts. Plenty of fitness trackers have debuted in the past couple of years, but the Alta HR remains our top pick for most users.