Apple Watch Series 12 vs Garmin Cirqa: A One-Week Sleep Tracking Comparison

A recent week-long test compared the sleep tracking and readiness metrics of the Apple Watch Series 12 and the Garmin Cirqa. The reviewer wore both devices simultaneously to evaluate how Apple’s new Vitals app and Readiness Score perform against Garmin’s established tracking ecosystem. While initial data showed significant discrepancies in nightly sleep scores—likely due to the Apple Watch’s calibration period—the two devices eventually converged on similar trends. Research from the health data API firm Terra suggests that while wearables are generally accurate for tracking sleep duration and broad trends, they often diverge when analyzing specific sleep stages due to differing algorithms. Ultimately, the reviewer concluded that both devices reached the same final assessment regarding overall readiness. The test serves as a reminder that while wearable data is useful for monitoring general health trends, users should avoid over-analyzing individual data points, as these devices provide estimates rather than absolute clinical measurements.