Watch your breathing and heart respond to each other, live.

Connect your chest strap on the left, start your camera on the right. Both run independently and both feed the timeline below — so you can watch your HRV move as your breathing slows down, in the same window, in real time.

HRV — LIVE (BLUETOOTH CHEST STRAP)

HEART RATE

RMSSD (MS)

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BREATHING — LIVE (CAMERA)

Camera not started. Sit back so your chest is visible.

BREATHS DETECTED

RATE (BPM)

Camera not started

HRV (RMSSD, ms)Breathing rate (bpm)

What to watch for: as your breathing rate line (teal) drops and steadies, your HRV line (orange) typically climbs — this is a real, well-documented effect called respiratory sinus arrhythmia. Try a slow box-breathing pattern (4s in, 4s hold, 4s out) and watch both lines move together over the next minute or two.

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.