About this product

Clair non-invasive wrist hormone monitor

Clair is a wrist-worn wellness wearable developed by women's health startup Clair Health, founded by Stanford graduates Jenny Duan and Abhinav Agarwal. It is designed to be the first device of its kind to offer continuous hormone monitoring for women in a non-invasive format.

Rather than requiring blood draws, urine tests, or finger-prick samples, Clair works through physiological inference — using an array of 10 biosensors to read signals from the body and generate real-time estimates of hormone patterns, including oestrogen and progesterone. The sensors monitor a range of physiological data points: skin temperature, heart rate, heart rate variability (HRV), respiratory rate, electrodermal activity, and sleep data. Onboard AI interprets these signals across more than 500 biomarkers to produce hormone insights.

For women navigating training load, cycle-based periodisation, or simply wanting a clearer picture of their hormonal health across the month, that kind of continuous visibility — delivered passively, without clinical appointments — represents a meaningful shift in what self-monitoring can look like day to day.

Beyond hormone tracking, Clair functions as a full-stack wellness wearable, capturing sleep quality, recovery, daily activity, and performance metrics alongside hormonal data. Everything is surfaced through an accompanying app, turning hormonal self-knowledge into a routine, accessible practice rather than a clinical undertaking.

Clair is expected to be available from November 2026. It is designed specifically for women, with the aim of making hormonal health monitoring as straightforward as wearing a watch.

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