CEOs and celebrities love Oura’s sleep-tracking ring. Its CEO has a plan to stay ahead of Apple and Google

One of the Apple Watch’s biggest threats has no screen, weighs about a fifth of an ounce and charges a monthly subscription for most of its features. Yet Oura is on pace for $1 billion in sales this year, boosted by its presence on the fingers of celebrities including Jennifer Aniston, Gwyneth Paltrow and Michael Dell.

The health-tracking ring that measures sleep, physical activity and other biometrics from your finger is having a moment, growing from a relatively obscure Finnish startup to a smartwatch alternative favored by CEOs, sports players and movie stars.

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