Develop heart-brain synchronization through guided breathing, real-time biometric feedback, and long-term HRV trend analysis
Heart rate variability (HRV) is a well-established biomarker reflecting autonomic nervous system balance. Higher HRV is associated with better stress resilience, recovery capacity, and overall cardiovascular health.
Liminal’s Heart Coherence module combines resonance breathing, daily HRV tracking, and personalized training advice — integrating with Apple Watch and Oura Ring (via Apple Health) to turn your physiological data into actionable insights.
A complete HRV training system from daily measurement to advanced analytics
Guided breathing sessions with adaptive pacing (4.5–6.5 breaths/min). Camera-based PPG captures heart rate in real time, calculating RMSSD and SDNN as you breathe.
Color-coded daily advice based on your morning HRV: Green (proceed), Yellow (limit intensity), or Red (rest day). Tracks your 7-day moving average and 30-day trend chart.
Automatic 7-day rolling baseline with 2-month normal range (25th–75th percentile). Identify patterns, track consistency, and see how lifestyle factors affect your HRV.
Discover your personal resonance breathing rate — the frequency at which your heart rate oscillations are strongest. The app adapts the breathing pacer to match your optimal rhythm.
A typical HRV coherence training session
Sit comfortably and breathe normally for 60 seconds. The app captures your resting heart rate and baseline HRV via camera PPG or connected wearable.
Follow the visual breathing pacer through inhale-hold-exhale cycles. The app starts at 6 breaths per minute and adjusts toward your resonance frequency as you practice.
Watch your HRV metrics change in real time. The coherence score reflects how synchronized your breathing and heart rate patterns are, with visual and audio cues guiding you toward deeper coherence.
Review your session RMSSD, SDNN, coherence ratio, and improvement from baseline. Newton AI offers personalized observations and suggests adjustments for your next session.
Physiologically grounded performance tracking
HRV values vary widely between individuals and are influenced by age, fitness level, sleep, and stress. Your personal trend over time is more meaningful than any single reading.
Explore the features by hovering over each one — watch the corresponding heart region light up
Hover over a feature to see the corresponding area of the heart light up.