PulseCES Innovation Award
TIME Best Inventions
FDA Breakthrough Device
Nature Medicine
Biosensor · Cortisol · SpO₂ · Sleep Architecture
The most trusted
sensor on your skin.
Press two fingers to your wrist. For the first time, hear what your body has been trying to say — cortisol, oxygen, sleep, all at once.
98%
SpO₂
62
BPM
↓14
Cortisol
Expert Panel · 01 / 03
Dr. Marcus Webb, MD
Interventional Cardiologist · Stanford Medical
In clinical settings, SpO₂ sampling frequency is not a preference — it is a diagnostic necessity. Pulse's 30-second continuous monitoring is the only consumer device I've seen that matches hospital-grade pulse oximetry protocols.
Published: JACC Cardiovascular Imaging, 2025
Blood Oxygen Accuracy
That saves lives.
SpO₂ accuracy varies wildly across wearables. Here's how Pulse measures up against the market — metric by metric, cleared by the FDA.
Metric
Pulse
Device A
Device B
Device C
30-day clinical trial period · Free returns
Expert Panel · 02 / 03
Sleep Architecture
Beyond "deep vs. light."
Most wearables label sleep in broad strokes. Pulse maps the full hypnogram — because knowing you slept 6 hours means nothing if you never reached deep sleep.
Hypnogram · Last Night
7h 42m
Metric
Pulse
Device A
Device B
Device C
Dr. Priya Nair, PhD
Sleep Neuroscientist · UCSF Sleep Lab
The correlation between cortisol spikes and sleep fragmentation is something we've studied in labs for decades. Pulse is the first consumer device that makes this relationship visible to the individual wearing it — validated against polysomnography with r² of 0.91.
Sleep Medicine, Vol. 98, 2025
Expert Panel · 03 / 03
Dr. Kenji Mori, MD PhD
Endocrinologist · Mayo Clinic
Cortisol is the master stress hormone, and its diurnal curve tells us more about a patient's metabolic health than almost any other single biomarker. The fact that Pulse captures this continuously — without a blood draw — changes what's possible in preventive endocrinology.
NEJM Evidence, 2025
Cortisol Tracking
No lab required.
No other wearable tracks cortisol. Pulse does it continuously, correlating your stress hormone curve with sleep quality, exercise recovery, and inflammation markers.
Cortisol Curve · Today
Metric
Pulse
Device A
Device B
Device C
Real Wearers · Real Data
The body was always
talking. Now you can hear it.
"I've been running ultras for 11 years. I thought I understood my recovery. Pulse showed me my cortisol was spiking at 3 PM every day I did back-to-back long runs — I was training into a stress hole I couldn't see. Moved my second run to morning. Shaved 4 minutes off my marathon time."
−4:12 marathon PR
After adjusting recovery windows
Tomás Reyes
Ultra-marathon runner, 38 · Boulder, CO
"I have ME/CFS and for three years nobody could tell me why some days I crashed completely and others I was fine. Pulse showed me the pattern: cortisol flatlines the night before a flare. Now I can see it coming 18 hours out. I've cut my bad days in half."
−52% flare days
Over 6-month tracking period
Sienna Okafor
Chronic fatigue patient, 34 · Austin, TX
"My wife and I both wore Pulse after our daughter was born. We thought we were getting 'enough' sleep — 6 hours, 7 hours some nights. Pulse showed us we were getting almost no deep sleep. We adjusted our shifts so one of us always got a 4-hour unbroken block. The 2 PM wall just… disappeared."
0 min → 94 min
Deep sleep per night, first 3 months
Daniel & Mei-Ling Park
New parents, 31 & 29 · Seattle, WA
94%
Report improved recovery decisions within 30 days
2.3×
More deep sleep identified vs. self-reported
18h
Average lead time on flare trigger detection
4.9★
Average rating across 12,400 verified reviews
Your Pulse · Your Configuration
Choose your band.
Start listening.
Select your band material, wrist size, and subscription tier. Ships in 3 business days. 30-day clinical trial period — full refund if your data doesn't speak to you.
Alpine Silicone
Sweat-proof, for training
Birchwood Leather
Ethically tanned, for daily wear
Midnight Woven
Breathable, for sleep tracking
Essentials
- SpO₂ + Heart Rate
- Basic Sleep Stages
- 7-day data history
Clinical
Most Popular- All Essentials features
- Cortisol Curve Tracking
- Hypnogram + Deep Analysis
- 90-day history
Research
- All Clinical features
- Raw biosensor data export
- API access
- Unlimited history