Pebble's smartwatch goes further than both the Smartwatch 2 and the Toq. It can be used with both Android and iOS devices. And the Pebble costs $150.
Qualcomm's Toq Smartwatch is similar in that it will work with any Android smartphone. The Toq costs a hefty $350.
The Sony Smartwatch 2 went on sale in September. Rather than make the device work only with Sony devices, Sony has made the Smartwatch 2 capable of working with any Android smartphone. It starts at $199.99.
Apple is widely expected to reveal its own Smartwatch in the early months of 2014.