Optical Sensor Array · Epoxy Resin Back
20mm Diameter · 2mm Thin · Beveled Edge
Your Health. Your Way.
A 20mm biometric disc that vanishes beneath the caseback of any timepiece. Heart rate, SpO2, temperature, and more — gathered silently, delivered privately. No screens. No compromise.
The Idea
The best health tech is the kind you forget you're wearing. nestor is a 20mm disc, just 2mm thin, that sits between your caseback and your wrist. A beveled comfort edge and a smooth medical-grade epoxy resin back — the same polished, translucent finish you'd find on the underside of a modern smartwatch — make it imperceptible against your skin.
No band to charge overnight. No screen pulling your attention. Just continuous daytime intelligence delivered to your phone when the watch comes off.
Optical Sensor Array · Epoxy Resin Back
20mm Diameter · 2mm Thin · Beveled Edge
Why nestor
Three principles, zero tradeoffs. nestor was designed for people who refuse to choose between their timepiece and their health.
Zero compromise on personal style. nestor adapts to you — not the other way around. Wear the watches you love without sacrificing a single thing.
Installs beneath existing timepieces with no modifications required. One module, countless watches. Swap freely between your collection.
Hidden from sight. Private haptic alerts only you can feel. No screens broadcasting your data, no blinking LEDs, no unwanted attention.
At 20mm across and 2mm thin, nestor fits beneath dress watches, divers, chronographs, field watches, pilots, and sport pieces alike.
The Details
Small enough to forget. Precise enough to matter. Every detail designed around one idea: disappear completely, perform flawlessly.
Daytime Intelligence
nestor tracks your health while you wear your watch. When the watch comes off at night, your data syncs and your wrist is free. No overnight charging. No sleep interruptions.
Beat-to-beat optical PPG captures resting rate, active zones, and trends throughout your day — not just snapshots.
Multi-wavelength oximetry running continuously in the background. Altitude, fitness, respiratory trends — surfaced when they matter.
Your autonomic nervous system tells a story. nestor reads it — recovery readiness, stress load, and daily resilience mapped in real time.
Subtle shifts in wrist temperature can signal illness, ovulation, or overtraining before you feel a thing. nestor catches the whisper.
Steps, calories, active minutes — tracked by an onboard accelerometer and processed at the edge. Your phone stays in your pocket.
Clean, focused, and built for clarity. Your daytime health data visualized with intention — trends, insights, and guidance without the noise.
Privacy First
Biometric data is the most personal data there is. nestor is built with privacy at the silicon level — on-device processing, end-to-end encryption, and full compliance with the standards that actually matter.
Coming Soon
Be among the first to wear health intelligence that no one can see. Sign up for early access and updates.