New Delhi, Nov. 10 -- Fitbit Labs has opened two experiments for a small group of Pixel Watch users in the United States. Selected users can track and log unusual health metrics, and that information goes to Google to shape how the features work before they reach everyone. A second test focuses on hypertension alerts and runs alongside the first. This push arrives as many users compare Pixel Watch with rivals and point to gaps in health features. Rather than switch on alerts that are not ready, Google is gathering real world data first and using it to tune thresholds, language, and follow ups.

Unusual Trend Detection is the first experiment. It watches for changes that fall outside your normal range and gives you a heads up when somethin...