C
iOS product
Added August 24, 2026
About the product
Temperature is the single most controllable input to sleep quality. Sleep is the single most controllable input to human health. Health is the foundation of every other thing you do with your life. CircadiaOS is built on that chain. Most people sleep in a room set to one static temperature all night. Your body doesn't work that way. Core body temperature drops into deep sleep, rises through REM, and cycles every ninety minutes. A static thermostat fights your physiology for eight hours a night, every night, for decades. CircadiaOS fixes it. Software-only. No mattress pod, no proprietary sensor, no new hardware to buy. It bridges two massive, fast-growing markets people are already in: wearables (Apple Watch, Ōura, Whoop, Garmin) and smart thermostats (Nest, Ecobee, Honeywell). By connecting devices millions already own, we deliver personalized sleep science without the hardware markup. Each night, CircadiaOS reads biometrics from the wearable, builds a personalized overnight temperature schedule, and runs the thermostat through it automatically. The methodology is grounded in peer-reviewed sleep science: a 14-night baseline calibration, then one-variable-at-a-time hypothesis testing against each user's personal biology. Most sleep apps tell you that you slept badly. CircadiaOS actually does something about it. We don't track. We intervene. Software-only. Adaptive. $19.99/month. Available on iOS.
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