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CYOK Ring
Coming SoonSleep Architecture · Vitals · Recovery

CYOK Ring

Precision Stainless Steel Recovery & Sleep Architecture on Your Finger.

Coming Soon · VIP Early AccessNo subscription

The finger's palmar digital arteries deliver the cleanest pulse-wave signal in the human body. Crafted from durable PVD-coated stainless steel with a hypoallergenic optical inner molding, CYOK Ring tracks your nocturnal heart rate stabilization curve, 5-pillar vitals corridor, early biometric strain, and daytime autonomic stress in an ultra-sleek 2.7 mm profile.

1. Select Finish / EditionObsidian Black PVD Stainless Steel
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Biometric & Hardware Capabilities

Surgical-Grade PVD Stainless Steel chassis with hypoallergenic inner shell
5–7 Day Ring Standby Time + 1.5-Hour Fast Wireless Charging Case
4-Stage Sleep Hypnogram, HR Nadir Stabilization Curve & Recovery Index
5-Pillar Overnight Vitals Corridor & 24–48h Early Symptom Radar
Luteal Phase Hormone Compensation (+0.35°C & +3 bpm RHR adjusted)
No subscription — full biometric ownership included
Technical Specifications
Outer Shell
Medical-Grade PVD Stainless SteelScratch-resistant PVD finish with hypoallergenic optical inner molding
Battery & Standby
5–7 Days per Charge1.5 Hours full recharge inside included pocket charging case
Palmar Sensor Suite
Infrared + Red + Green Optical PPG + Thermal NTCDirect digital artery pulse-wave capture + 3D accelerometer
Form Factor
2.7 mm Ultra-Thin ProfileImperceptible during sleep, typing, and daily wear
Water Resistance
5 ATM / 50 MetersSafe for showering, swimming, sauna, and ice baths
EMF & Sync Control
Quiet / Low-EMF Nocturnal ModeStores overnight biometrics locally; syncs on morning wake
In the Box
  • CYOK Smart Ring in Selected PVD Stainless Steel Finish
  • Pocket Wireless Charging Case (USB-C)
  • Braided USB-C Charging Cable
  • Full CYOK iOS App Access (EN & RO) — No Subscription

All 9 CYOK Intelligence Pillars Included with CYOK Ring

No subscription.

PILLAR 01

Morning Readiness & Recovery Intelligence

A locked, manipulation-free morning score calibrated against your 14-day personal baseline—with zero anxiety.

PILLAR 02

Sleep Architecture, Recovery Index & Smart Alarm

4-stage sleep hypnograms, nocturnal heart-rate stabilization curves, dynamic sleep debt planning, and gentle haptic wake.

PILLAR 03

Day Strain (0–21), Strength Trainer & GPS Workouts

Cardiovascular zone load meets mechanical weightlifting tonnage so low-HR heavy sessions are never under-reported.

PILLAR 04

Overnight Vitals & Symptom Radar

Multi-parameter biometric deviation tracking that catches physiological strain 24–48 hours before you feel run down.

PILLAR 05

Stress Monitor, Autonomic Biofeedback & Longevity

Real-time daytime autonomic arousal separation, live HRV-guided breathwork, and biological cardiovascular aging velocity.

PILLAR 06

Lifestyle Journal, Habit Correlation & Self-Experimentation

Turn your body into a clinical N=1 lab—discovering exactly which habits boost or sabotage your HRV and deep sleep.

PILLAR 07

Cycle & Hormone Phase Intelligence

Physiology-aware scoring that respects natural luteal thermal and heart-rate shifts instead of penalizing your recovery.

PILLAR 08

Precision Hardware Hub, Calibration & Low-EMF Mode

Dedicated optical calibration for wrist, bicep, or finger placement, Quiet Low-EMF sync control, and safe OTA firmware updates.

PILLAR 09

Ecosystem, Widgets, Localization & Data Ownership

Your biometrics belong to you—with on-device Physician PDF reports, iOS 18 Control Center widgets, and full English & Romanian support.