The French company billed "Activite" as a chic watch with computing brains to track steps taken, calories burned, distance traveled, and sleep patterns.
"Our mission is to inspire health," Withings chief executive Cedric Hutchings said in a release.
Fitness has been a hotspot in the budding trend of wearable computers, with activity monitoring bracelets or pendants such as UP24 and Fitbit finding success in the market.
Apple built a Health Kit into the newest version of the software powering iPhones and iPads, adding fuel to rumors that the California company plans to release a smart watch of its own.
"Activite" was created by designers in Paris in a spirit of "reinterpreting classical time pieces."
It use Bluetooth connectivity to synch with Withing Health Mate applications on Apple smartphones or tablets.
"Activite" will be priced at $390 when it is released later this year, according to Withings.
Since being founded in 2009, the firm has become best known for a smart bathroom scale that lets people tap into powers of the Internet and smartphones to manage their weight.