Clair just launched with the first continuous hormone tracker for women

Clair, a hormone-tracking wearable, brings continuous hormone monitoring that doesn’t require pricking your finger or scheduling a blood draw. The device tracks estrogen and progesterone patterns through biosensors on your wrist, passively and in real-time.

The first wearable hormone tracker designed for women.

What Clair tracks

Clair targets four main uses:

• Fertility tracking: Most ovulation tests detect the LH surge when your body attempts to ovulate, but can’t confirm whether ovulation actually occurred. Clair tracks the progesterone rise that follows ovulation, confirming the egg was released. You’ll get notifications before your fertile window opens, not after it’s passed.
• Hormonal health management: When you’re exhausted after eight hours of sleep and your fitness tracker says recovery is “excellent,” Clair can show that progesterone spiked overnight, explaining the fatigue. Continuous tracking reveals patterns that snapshot testing misses, showing how hormones affect mood, energy, and sleep quality.
• Athletic performance: Clair can give insight into why high-intensity training may feel easier during the late follicular phase, and recovery feels harder in the luteal phase, allowing you to adjust training based on actual physiology rather than guessing.
• Perimenopause and menopause support: Clair will provide data during hormonal transitions that traditionally leave women without clear information about what’s happening in their bodies.

How it works

Clair uses 10 biosensors to track hormonal shifts: skin temperature, resting heart rate, heart rate variability, sleep architecture, breathing rate, electrodermal activity, and motion tracking. These signals correlate with estrogen and progesterone fluctuations throughout your cycle.

Women’s health tech catches up

Hormone tracking has been stuck between two options: invasive and expensive (blood draws at the doctor), or manual and annoying (pricking fingers at home, remembering to mail in results). Clair makes it continuous and passive—wear it and get data without putting in too much effort.

Hormones affect mood, energy, sleep, and fertility daily, yet tracking them has been inconvenient enough that most women skip it entirely. For women trying to conceive, managing PCOS, training for performance, or navigating perimenopause, Clair may remove the barrier. It’s a significant step forward for women’s health tech, bringing hormone monitoring into the massive wearable market.

Where to join

Clair’s waitlist is now open at wearclair.com.