Fitness and health tracking startup Circular today announced a host of new features including hardware upgrades for the latest version of its smart ring — the thinnest in the world. The upgrades arrive amid an escalating battle between smart ring manufacturers. While your FitBit and your Garmin and your Whoop bracelet wearables may all be easily distinguishable, you’d be forgiven for not immediately being able to tell the difference between the hardware of an Oura, Superhuman, or a RingConn from afar. As such, the features and software these health trackers come with are also their biggest differentiators — stylistic preferences…
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