Watch your Poincaré plot build, beat by beat.

Each heartbeat plots one dot — this RR interval against the next. The shape of the cloud is your autonomic state, live: tight and narrow under stress, wide and open when relaxed.

LIVE POINCARÉ PLOT — RRₙ vs RRₙ₊₁

X: RRₙ (ms) · Y: RRₙ₊₁ (ms)

SD1 (SHORT-TERM, MS)

SD2 (LONG-TERM, MS)

SD1/SD2 RATIO

SIGNAL QUALITY

0/0 beats clean

Not connected

What SD1 and SD2 mean: SD1 is the width of the cloud — beat-to-beat variability, closely related to RMSSD and parasympathetic tone. SD2 is the length of the cloud — longer-term variability across the whole session. A tight, narrow cloud (low SD1) generally reflects sympathetic dominance — stress, load. A wide, open cloud (higher SD1) generally reflects parasympathetic recovery.

This is the same live RR feed as hrv.live, plotted a different way. See the single-number RMSSD dial instead, or run both side by side.

Disclaimer

hrv.live, rmssd.com, and Time Domain Labs tools are for informational and educational purposes only. Not a medical device. Not FDA cleared or approved. No medical advice is provided.

We do not diagnose, treat, cure, or prevent any disease or medical condition. RMSSD, pNN50, and RR interval data are measures of autonomic activity, not a medical diagnosis.

Do not use this information to make medical decisions. Always consult a qualified healthcare professional for medical concerns. If you have a medical emergency, call 911.

You assume full responsibility for use of this site and its data.