CircadiaOS
Earth from space at night, city lights glowing

The world is vast. Your sleep is personal.

Every night comes down to one room, one body, one temperature. CircadiaOS personalizes your thermostat to the way you actually sleep — and learns what to change next.

Download on the App Store
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Your thermostat, all night.

CircadiaOS adjusts it while you sleep.

Last night with CircadiaOS

10 pmWinding down71°
12 amDeep sleep69°
3 amColdest point68°
5 amWarming up70°
6:30 amWake-up72°

Works with Nest, ecobee, Honeywell Home, Sensi, and 15+ more via HomeKit and SmartThings. Nothing new to buy.

See your night. Control it.

Simple by design. No learning curve.

Build your night — temperature curve with bedtime, wake time, and bedroom settings
Sleep results — score 75, overnight temperature curve, schedule and sleep metrics
CircadiaOS home — 68°F room temperature, active adjustment, tonight's schedule
14 nights free — bedroom window with four temperature setpoints

It learns from you.

Each morning your wearable reports how you slept. Over time, CircadiaOS finds the schedule that works best for you.

Night 1–14 Runs your starting schedule Baseline
Night 15–28 Tries cooling you more before bed Kept
Night 29–42 Tries a deeper drop at midnight Reverted
Night 43–56 Warms you up before your alarm Kept
Night 57+ Your schedule, shaped by your sleep Personal

Illustrative timeline. Calibration takes about 14 qualifying nights. Personalization begins on Premium with a connected wearable.

Your wearable reads the night. We set the room.

No mattress pad. No water tank. CircadiaOS connects the thermostat you already own to the wearable you already wear.

Thermostats

Nest · ecobee · Honeywell Home · Sensi · Trane · Mysa · Aqara · Eve · Meross · Lux · Stelpro · Radio Thermostat · Sinopé · Centralite · Remotec · Alarm.com · GoControl

+ more via SmartThings and HomeKit · Check compatibility
Wearables (optional)

Apple Watch · Oura Ring · Whoop · Garmin · Fitbit

Optional for the starting schedule. Enables sleep-based personalization on Premium.
Requirements

iPhone · iOS 18+ · United States App Store

14 nights free.

Then $12.99/month or $99.99/year. Billed by Apple. Cancel any time.

Free
$0
Forever
  • Starting schedule from your profile
  • Optional wearable connection
  • Nightly sleep data and trends
  • Set the schedule by hand
Premium
$12.99 /mo
or $99.99/year · 14-night free trial
  • Automatic thermostat control
  • Four-phase overnight schedule
  • 14-night calibration
  • One-variable-at-a-time learning
  • Personalized from your wearable

Run it tonight.

Two minutes to set up. Nothing to buy.

Download on the App Store