StealthySTEALTHY
Stealthy smart clasp
CLASP MODULE + SPORTS BAND

Keep your timepiece. Track the vitals.

Driven by a sophisticated dual-sensor architecture, the module continuously fuses optical data to deliver HRV, heart rate, and SpO₂ at medical-grade resolution, 24/7.

Pre Order Now Explore the Features
The ecosystem

One Tracker. Two Modes. Continuous Intelligence.

Whether hidden discreetly in the clasp of your favorite watch or swapped to the sports band for intense training, your biometrics are silently captured and fed into a single, continuous data stream.

Tap for sound
The Watch Module

A timepiece first. A tracker second.

Discreet & Ergonomic module that discreetly sits under your watch clasp.

NO RESEDUE ADHESIVEHIGH FINISH10 ATM

Sports Band

A screenless, 24/7 biometric tracker built for peak performance. Free from digital distractions and glowing notifications, it operates invisibly in the background focusing entirely on deep, actionable intelligence like sleep architecture, recovery scoring, and daily physical exertion.

WIRELESS CHARGE + BLE 5.3

Bank-Grade Privacy

On-device AES-256 encryption. Your biometrics never leave your wrist without your permission. Ever.

Wear it with your Rolex.

The clasp slots underneath any 18–22 mm strap — leather, rubber, oyster. No compromise on the watch you love.

Two Sensors. One Signal.

A discreet module for your watch clasp + free sports band engineered as one ecosystem. Wear the timepiece you love. Get elite biometrics, in stealth.

62bpm
9:41STEALTHY
Today
You're peaking.
82RECOVERY
HRV+12 ms
98%
Sleep
62
RHR
14.2
Strain
The Stealthy App

One ecosystem.
Zero compromise.

Two devices, one data layer. The Stealthy app fuses signals from the watch and the clasp into clear, actionable insight only when you ask.

  • One Unified Stream

    Watch and clasp data fuse into a single dashboard — no fragmented apps, no double readings.

  • AI Health Coach

    Conversational guidance that learns your patterns from both sensors and adapts in real time.

  • Continuous Recovery

    Sleep, strain, HRV, and SpO₂ — captured around the clock, on the wrist you already wear.

Featured in
WIRED
GQ
WSJ
FAST COMPANY
THE VERGE
MEN'S HEALTH
FORBES
WIRED
GQ
WSJ
FAST COMPANY
THE VERGE
MEN'S HEALTH
FORBES
WIRED
GQ
WSJ
FAST COMPANY
THE VERGE
MEN'S HEALTH
FORBES
"I refuse to take off my Submariner. With Stealthy, I don't have to and I still get every health metric I need"
— FOUNDER & IRONMAN FINISHER

Ready to go Stealth?

Join 50,000+ on the waitlist. First batch ships Spring 2026.