This description also fits the Apple Watch and other GPS-enabled fitness bands. But today, Fitbit released a new product that might finally get at what people really need: A (relatively) low-cost, wear-it-forever smartwatch that does more than count steps. It logs your workouts, your sleep, and your heart rate. It's 39 mm in width (the Apple Watch comes in two sizes 38 and 42 mm) and is, according to the company, the lightest metal smartwatch on the market today. And it's just $200.