Startups at the annual gadget extravaganza in Las Vegas touted technology-enhanced accessories designed to look fetching on the outside while scrutinizing what is happening on the inside of wearers.

"We want to democratize personal health," said Amaury Kosman, founder of the French startup that created the Circular Ring.

While that goal was shared by an array of exhibitors, some experts worried a trend of ceaselessly tracking steps, time sitting, heart rate and more could bring risks of stress and addiction.

Circular Ring provides a wearer with a daily "energy score" based on the intensity of their activity, factoring in heart rate, body temperature, blood oxygen levels and other data, according to Kosman.

"At night it continues, we track the phases of sleep, how long it takes you to fall asleep, if you are aligned with your circadian rhythm, etc," he said of the ring, which will cost less than 300 euros ($340) when it hits the market later this year.

"And in the morning it vibrates to wake you up at the right time."

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