CircadiaOS is an iPhone app that makes your existing smart thermostat follow a four-phase overnight temperature schedule, cooler for deep sleep and warmer before you wake. On Premium, it refines the schedule from your wearable's sleep data.

Do I need a smart thermostat and wearable?

A smart thermostat is required only for Premium's automatic control. Free works without one and gives you a starting schedule you can set manually. A wearable is optional for both plans but enhances sleep data tracking and Premium's personalization.

How long does setup take?

Setup takes about five minutes: create an account, answer profile questions, sign in to your thermostat account, and optionally connect a wearable. Your first schedule runs that night.

How does the adjustment process work?

CircadiaOS changes one temperature setpoint at a time, holds it for 7 to 14 nights, and keeps the change only if your sleep score beats your reference point by a clear margin. Otherwise it reverts and tries the other direction.

Can I cancel my Premium subscription?

Yes, you can cancel anytime from your Apple subscriptions in your iPhone settings. Your plan stays active until the end of the period you have paid for.

Business profile · Health tech

CircadiaOS

The thermostat schedule that learns from your sleep

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An iPhone app that adjusts your existing smart thermostat overnight based on your sleep data, cooling as you fall asleep and warming before you wake.

About

Homepage of CircadiaOS

CircadiaOS is an iPhone app that automates your smart thermostat to follow a four-phase overnight temperature schedule. The app cools your bedroom as you fall asleep, keeps it coolest in early night, and warms it before you wake, using a schedule built from sleep research and your personal profile.

On Premium, CircadiaOS refines your schedule one temperature adjustment at a time, holding each change for 7 to 14 nights and keeping only the adjustments your wearable's sleep data supports. It integrates with Apple Watch, Oura Ring, Whoop, Garmin, and Fitbit to read your sleep data, and works with Nest, ecobee, Honeywell Home, and 20+ other smart thermostat brands.

The app requires no new hardware—it uses the thermostat and wearable you already own. Setup takes about five minutes, and you can cancel Premium anytime through Apple subscriptions.

Features at a glance

Four-phase overnight temperature schedule (pre-sleep, early night, late night, pre-wake)
One-variable-at-a-time personalization held for 7 to 14 nights per change
Wearable integration: Apple Watch, Oura Ring, Whoop, Garmin, Fitbit
Thermostat compatibility with Nest, ecobee, Honeywell Home and 20+ brands
14-night starting period and reference point on Premium
User-set temperature floor and ceiling, never below 63°F
Why This Curve display showing where each setpoint came from and data behind it
Best vs Worst nights comparison showing highest and lowest scoring nights
Manual override capability with automatic resumption next night
Referral program earning free months of Premium for every three friends who join

Pricing

Pricing model: Freemium

Free: starting temperature schedule, optional wearable connection, nightly sleep data and trends, no thermostat control. Premium (monthly): $12.99/month with automatic thermostat control, four-phase schedule, 14-night starting period, one-variable-at-a-time adjustment from wearable data, 14-day free

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CircadiaOS at a glance

CircadiaOS

Category: Health tech
Based in: Washington, DC area, United States
Website: circadiaos.com
Founders: Dominic Mangino (Co-founder)
Jackson Knox (Co-founder)
Votes: 0

CircadiaOS metrics

Info on circadiaos.com: Ahrefs Domain Rating and Majestic link info, each with the change since the last update.
Metric	Value
Domain Rating	13 no change since last check
Trust Flow	4 no change since last check
Citation Flow	24 no change since last check
Referring domains	47 no change since last check
External backlinks	212 no change since last check

Info: Ahrefs Domain Rating as of 6 Nov 2026, last changed 4 Nov 2026. Info: top topic is Reference/Education (4). Info: Majestic as of 4 Nov 2026, last changed 4 Nov 2026. Link info from Majestic. Trust Flow, Citation Flow and Topical Trust Flow are trademarks of Majestic-12 Ltd.

CircadiaOS domain at a glance

Show it at a glance

Source: the public RDAP record, checked 6 Nov 2026, 08:19 UTC.
Domain age	7 months
Registered	10 Mar 2026
Expires	10 Mar 2027
Registrar	IONOS SE
DNSSEC	Not signed

Complete domain info for circadiaos.com

CircadiaOS launch receipt at a glance

The record for CircadiaOS after its launch on Business Listing Info (4 November 2026), from the readings we keep.
Measure	At launch, then latest
Domain Rating (Ahrefs)	13 to 13 no change since launch 4 Nov 2026, then 5 Nov 2026
Trust Flow (Majestic)	4 first measured 4 Nov 2026
Referring domains (Majestic)	47 first measured 4 Nov 2026

Day 1 since launch. Next receipt: day 30, 4 Dec 2026. Many things move these figures, so a change is not proof of cause. Only stored readings are shown.

Biggest gains on Business Listing Info

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Quick answers

What is CircadiaOS?: CircadiaOS is an iPhone app that makes your existing smart thermostat follow a four-phase overnight temperature schedule, cooler for deep sleep and warmer before you wake. On Premium, it refines the schedule from your wearable's sleep data.
Do I need a smart thermostat and wearable?: A smart thermostat is required only for Premium's automatic control. Free works without one and gives you a starting schedule you can set manually. A wearable is optional for both plans but enhances sleep data tracking and Premium's personalization.
How long does setup take?: Setup takes about five minutes: create an account, answer profile questions, sign in to your thermostat account, and optionally connect a wearable. Your first schedule runs that night.
How does the adjustment process work?: CircadiaOS changes one temperature setpoint at a time, holds it for 7 to 14 nights, and keeps the change only if your sleep score beats your reference point by a clear margin. Otherwise it reverts and tries the other direction.
Can I cancel my Premium subscription?: Yes, you can cancel anytime from your Apple subscriptions in your iPhone settings. Your plan stays active until the end of the period you have paid for.

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