Kairis: Circadian Rhythm

Free Circadian Clock + iPhone widgets. See when your body is primed for deep work, training, and rest — minute by minute, powered by the cosinor model. Sync compatible health data from Apple Health to personalize your experience. Kairis is not a habit tracker. It's a biological timing system, built for people who want to operate at peak capacity — consistently, deliberately, and in sync with their physiology. — THE CIRCADIAN CLOCK (FREE) Visualize your day in biological time. The clock maps how your body shifts hour by hour: • Performance: alertness, reaction time, coordination, muscle strength, cardiovascular efficiency • Metabolism: blood pressure, body temperature, heart rate, glucose tolerance • Hormones: melatonin, testosterone, cortisol, growth hormone • Restoration: pulmonary function, sleep propensity, digestive rhythm • Sleep & wake cycle: stages (N1, N2, N3, REM), positioning, time to bedtime, time to wake Powered by the cosinor model — the statistical method used in chronobiology research — for sharp, smooth, individualized daily curves. — APPLE HEALTH Connect Apple Health to automatically import compatible health data. • Use Apple Health sleep data to personalize your Circadian Clock • Sync supported workouts, mindfulness sessions, heart rate, and other health metrics • Reduce manual tracking and keep your data up to date across apps — HOME SCREEN WIDGETS (FREE) Your circadian state, always visible. Track your performance window, sleep cycle stage, hormone levels, and time-to-bedtime directly on your Home Screen — without opening the app. — EXTERNAL CONDITIONS Your biology responds to the environment. Monitor what's shaping your rhythms: • Solar patterns: day length, sunrise, sunset • Lunar cycle: current phase with visual indicator • Atmospheric: temperature and UV index — PROTOCOLS FOR LIFE Turn insight into action. Structure your day with protocols mapped to your biology: • Morning, afternoon, and evening routines • Focused work blocks • Training sessions • Recovery periods • Bedtime wind-down Recurring schedules, configurable notifications, a clean execution system. Think of it as a configurable daily plan that runs in lockstep with your physiology. — MINDFULNESS • Breathing: physiological sigh, box breathing, cyclic hyperventilation, 4-7-8 — calibrated to your lung capacity with precise inhale, exhale, and hold control • Meditation: focused attention, open monitoring, reflective, generative — guided or unguided, 1 minute to 1 hour • Yoga Nidra: full sessions for deep rest and NSDR • Journaling: AI-generated prompts (where supported) plus curated libraries across four categories Background audio, ambient sounds (nature, ocean, white/pink/brown noise), binaural beats, multiple gong styles. Every session is fully configurable. — TRACK WHAT FUELS PERFORMANCE Monitor the inputs that shape your biology — manually or through supported Apple Health integrations: • Light exposure • Sleep quality • Cardio, resistance, breathing, and meditation minutes • Social interactions (dyadic, triadic, group, familial) • Internal interactions (emotional processing, cognitive restructuring, appreciation, intentions) Daily goals with visual streaks that reflect real physiological support — not arbitrary habits. — Kairis is built for operators, athletes, and anyone who wants to work with their physiology instead of against it. — Terms of Use: https://www.kairis.app/terms Privacy Policy: https://www.kairis.app/privacy Support: https://www.kairis.app/support