Horizon

Smart fitness ring maker Oura announced a partnership with Amazon today to sell its products through the e-commerce site. The Heritage ring starts from $299 and the Horizon ring starts from $399. The most distinctive difference between the two is that Heritage rings have a flat top and Horizon rings don’t have that. Since Oura launched the Oura Ring 3, India-based startup Ultrahuman released two rings including Ultrahuman Air last year. Last year, Oura launched the Circles feature to encourage users to share their stats with friends and family.