Circular Ring 2 — Smart Ring for Sleep and Activity Tracking

Tracking Daily Data with Circular Ring 2

Circular Ring 2 is a titanium smart ring that tracks health signals continuously with seven onboard sensors, covering more than 13 features. It includes a single-lead ECG reading that takes about 40 seconds, along with sleep stages, HRV-based recovery, stress, and cycle tracking, all reviewed in the Circular app. The ring includes an AI coach called Kira that turns the wearer's data into plain-language insights about activity, stress, and sleep schedule. Circular states that core features are included without a mandatory subscription, with optional Pro features. Weighing about 3 to 4 grams, the ring is designed to be worn day and night with a stated battery life of about 8 days, suiting people who want low-profile tracking without charging a watch every night.

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