Breathing Exercise

A paced-breath visualizer for your browser. Pick a built-in pattern — 4-7-8 for sleep, box for focus, coherent for heart-rate variability — or build a custom 4-phase sequence (inhale, hold, exhale, hold). Set a session length in minutes, hit Start, and follow the expanding circle. Pure client-side, no upload, no tracking — your pattern and last session are kept in your own browser only.

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About the patterns

4-7-8 (Dr. Andrew Weil) is a four-second inhale, seven-second hold, and eight-second exhale. The long exhale dominates the parasympathetic nervous system and is the canonical "calm down" or "fall asleep" pattern.

Box is a four-four-four-four cadence (inhale, hold, exhale, hold) — six breaths per minute. It's the "tactical" pattern used by Navy SEALs and other operators to stay calm under load.

Coherent is a five-second inhale and a five-second exhale, no holds, at exactly six breaths per minute. That's the resonance-frequency sweet spot for heart-rate variability training.

Triangle is a simple four-four-four sequence (no hold-out) — the gentlest "first step" into breathwork.

Deep belly is six-two-eight (inhale, hold, exhale). A long exhale with a brief top hold; a useful "mid-day reset" pattern.

Educational and well-being tool only — not a medical device. If you have a respiratory or cardiovascular condition, talk to your clinician before starting a breathwork practice.