Kairo: Circadian Rhythm

Most apps tell you what already happened. Kairo looks forward — it maps the day you haven't lived yet and shows you the right time to do each thing.

Your body runs on a circadian rhythm: focus, creativity, physical strength and the urge to sleep each peak at different hours. Kairo estimates that rhythm from your sleep timing, heart-rate variability and chronotype, turns it into a live energy curve, and proposes a day that works with your biology instead of against the clock on the wall.

WHAT KAIRO DOES
• Estimates your circadian phase from Apple Health signals and a short science-based onboarding (MCTQ chronotype).
• Draws a live energy curve — when your analytic focus, your creative insight and your body are each at their best.
• Finds your real peak windows and suggests what to do in each: deep work on the cognitive peak, creative work at the off-peak hour, strength near the late-afternoon body-temperature max.
• Proposes a plan around your existing calendar — and never writes a block until you tap to confirm.
• Learns. The more nights it sees, the more it personalizes — all on your device.

PRIVATE BY CONSTRUCTION
Your raw health data is processed on your iPhone and is never uploaded, sold, or used for advertising. The cloud is never in the loop for a recommendation. Optional cross-device sync stores only an encrypted blob of model settings — never raw sleep, heart-rate or HRV streams. See https://kairoapp.xyz/privacy.

REAL CHRONOBIOLOGY, NOT HOROSCOPES
Kairo runs on the same models sleep researchers use — MCTQ chronotyping, the two-process model of sleep regulation, and the light phase-response curve. It shows honest windows, not fake-precise minutes.

KAIRO PRO
Kairo is free to use: the energy curve, manual logging and daily guidance. Pro unlocks:
• Active planning — add your best blocks to your calendar (propose → confirm)
• Travel, jet-lag, eating-window and morning-light timing
• Cross-device encrypted sync
• Generative soundscapes and the high-fidelity ambient field

Pro is an auto-renewing subscription:
• Kairo Pro Weekly — $6.99/week, with a 3-day free trial
• Kairo Pro Monthly — $9.99/month, with a 7-day free trial
• Kairo Pro Yearly — $39.99/year, with a 7-day free trial
Your free trial converts to a paid subscription unless cancelled at least 24 hours before it ends. Payment is charged to your Apple ID; manage or cancel anytime in the App Store.

Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy: https://kairoapp.xyz/privacy

Kairo estimates circadian timing to help you plan your day. It is not medical advice and does not diagnose or treat any sleep or health condition.