BreatheBox: Custom Rhythm

BreatheBox brings guided breathwork to your pocket. Three proven clinical patterns — Box breathing, 4-7-8 relaxing breath, and Coherent 5.5 — plus a custom rhythm editor so you can build and save your own breathing pattern. A smooth animated circle leads every inhale, hold, exhale, and rest. No timer setup, no subscription, no account. WHY BREATHE? Slow, paced breathing activates the parasympathetic nervous system, lowers heart rate, and reduces cortisol in minutes. Athletes use it before competition, surgeons before surgery, Navy SEALs under pressure. BreatheBox puts the same toolkit on your iPhone — free of bloat, paywalls, and dashboards. THREE CLINICAL PRESETS • Box breathing (4-4-4-4) — used by the Navy SEALs and NASA to steady focus under stress. Equal four-second phases build concentration and calm in noisy environments. • 4-7-8 (4-7-8-0) — Dr. Andrew Weil's natural tranquilizer. Four seconds in, seven hold, eight out. One of the fastest ways to fall asleep and quiet a racing mind. • Coherent 5.5 (5.5-0-5.5-0) — heart-rate coherence at 5.5 breaths per minute. Used in HRV training and biofeedback. CUSTOM RHYTHM EDITOR The editor sets BreatheBox apart. Four sliders — inhale, hold after inhale, exhale, rest after exhale — from 1 to 10 seconds. A live preview circle shows the rhythm as you drag. Name it anything, save it, and it appears on your home screen next to the presets. Swipe left to rename or delete. Build 2-4-6-8, Wim Hoff-style, pranayama ratios — whatever your coach or therapist recommends. EVERYTHING YOU NEED, NOTHING YOU DON'T • Works 100% offline — no signal, no problem • No account, no email, no sign-in wall • No analytics, no ads, no tracking • No subscriptions, no paywalls, no "premium" tier • Daily session counter to build a habit • Light and dark, follows your system • English and Chinese, fully switchable in Settings • Portrait only, one-handed WHO IT'S FOR • People who overthink before sleep — try 4-7-8 at bedtime • Students and exam takers — box breathing between tests • Gamers and streamers — reset between rounds • Meditation beginners who find empty-head meditation too hard • Anyone who wants a 2-minute anxiety reset without another subscription BreatheBox is a single, one-time purchase. No trial that becomes a subscription. No paywall behind the breathing circle. Pay once, breathe forever.