Rai says period prediction is only the beginning of the company’s interest in menstruation and fertility. “It’s an underinvested area in wearables,” he says. A study conducted in partnership with researchers at the University of California San Diego showed that the Oura ring can use temperature changes to identify pregnancy around nine days before an at-home pregnancy test, though pregnancy prediction is not part of the device at this point.

Wetsman, N. (2021, October 26). Oura adds period prediction and heart rate to its next-gen smart ring. The Verge. https://www.theverge.com/2021/10/26/22740187/oura-period-prediction-heart-rate-smart-ring