See burnout coming.Stop it cold.
We connect your schedule to your stress data, so you know before you break.
That meeting—
how much stress?
Which meetings drain you? Who recharges you? Turn vague feelings into hard data.
Q3 Strategy Meeting
Deep Work (Writing)
Syncing real-time HRV data...
Current HRV
Stress Prediction
Stress detected from morning meeting. We recommend a 3-minute breathing session before your 2PM focus time.
* hrv.works securely integrates with Apple HealthKit. All data is processed on-device.
Push hard, or
take it easy?
We analyze your body and schedule to suggest the right pace for today.
Morning Brief
Start each day knowing exactly how your body recovered overnight. Get a clear summary of your readiness and energy levels.
Good morning
Today's Readiness: 85%
Smart Recommendations
Breathing exercises when stressed, walks when recovered, rest when depleted. Actions tailored to your current state.
Pattern Detection
AI automatically identifies what's draining your energy—late meetings, poor sleep, or that extra coffee.
Pattern detected: Monday meetings cause 23% more stress than average
Beyond measurement.
Into action.
We don't just show HRV numbers. We tell you exactly how to change your schedule.
Biological Age
Know your body's true age—not your calendar age. Based on VO2 Max, resting heart rate, and sleep quality.
Recovery Score
Should you push hard or take it easy? Compare your HRV to your 60-day baseline for training readiness.
Live Stress Monitor
See your stress level update in real-time with rolling averages. Get alerts for sustained high stress.
Habit
Impact
We'll tell you exactly how much that drink last night aged you. See how alcohol, coffee, and late meals affect your recovery.
Last night's impact
Context Engine™
Get clear answers to "Why am I tired today?" By mapping your calendar events to HRV data, we analyze which tasks drain your energy and whose meetings stress you out.
10-Year Projection
At your current aging pace, see where you'll be in 10 years. Pace of 0.9 = only 9 years aged in a decade.
Wearable Integration
Background HRV collection while you sleep. No manual tracking needed—just wear your device.
Body Battery
Should you work out today? Based on sleep recovery data, see your available energy from 0-100%.
100% On-Device
Your data never leaves your device
Not a feeling.
It's data.
HRV is the most medically validated indicator of autonomic nervous system balance.
What is HRV?
Heart Rate Variability measures the time between heartbeats. Higher variability = better recovery and resilience. Lower = stress and fatigue.
How We Calculate Bio Age
VO2 Max
The strongest predictor of all-cause mortality. Every 1 MET increase = 12% lower death risk.
Resting Heart Rate
10 bpm higher = 9% higher mortality risk. Your heart efficiency matters.
Sleep Quality
Deep sleep drives HRV recovery. Poor sleep accelerates aging by 0.5 years annually.
Activity Level
150 min/week of moderate exercise adds 3-7 years of healthy lifespan.
Research Foundation
Our algorithms are built on decades of longitudinal research data from peer-reviewed publications.
Norwegian HUNT Study
46 years of data from 55,000+ participants
FRIEND Registry
VO2max percentiles by age and sex
JACC 2018
Cardiorespiratory fitness and mortality
Behind 'I'm tired',
there's a reason.
HRV Works doesn't just show fatigue. It reveals the context—what actually drained you.
| Feature | HRV Works | Whoop | Oura |
|---|---|---|---|
| Calendar Integration | |||
| Meeting Stress Prediction | |||
| Fatigue Root Cause Analysis | |||
| 100% On-Device Processing | Partial | ||
| No Dedicated Hardware | |||
| Monthly Price | $4.99 | $30 | $5.99 |
HRV Works
Whoop
Oura
Works with your existing Apple Watch. No extra hardware needed.
Stories from those who beat burnout
“I discovered my unexplained fatigue was caused by 'marathon meetings' in the morning. Following the breathing guide before and after meetings changed my evening energy.”
Jimin Kim
Product Manager, 32
“As an athlete, preventing overtraining is crucial. hrv.works recovery score is remarkably accurate. It tells me exactly when to rest.”
Sunghoon Park
Crossfit Coach, 29
“As a startup founder, I thought burnout was inevitable. HRV Works showed me which meetings were killing my productivity. Now I protect my calendar.”
Sarah Chen
Founder & CEO, 38
“Night shifts destroyed my sleep patterns. This app helped me find the optimal recovery windows. My HRV improved 25% in two months.”
Marcus Lee
ER Nurse, 34
“Balancing kids and work, I never knew why some days felt impossible. Turns out my bad days correlated with poor sleep recovery.”
Emily Rodriguez
Working Mom, 41
“Finally, a health app that doesn't just show data but tells me what to DO. The morning brief is now part of my routine.”
David Park
Healthcare Executive, 45
Tomorrow's condition
is decided today.
Don't miss the warning signs from your calendar. Check now.