CircadiaOS: Sleep Tracker
CircadiaOS LLC Health & Fitness iPhoneiPadiPod touch
CircadiaOS: Sleep Tracker is a free Health & Fitness app for iPhone and iPad by CircadiaOS LLC. Rated 3.5/5 from 11 ratings. Requires iOS 18.0.
- Rating
- 3.5
- 11 ratings
- Price
- Free
- on the App Store
- Size
- 25 MB
- Age 17+
- Updated
- Oct 4
- 2026 · v1.7.11
Screenshots
About CircadiaOS: Sleep Tracker
CircadiaOS adjusts your bedroom temperature through the night, automatically. Your body temperature isn't constant while you sleep. It drops as you fall asleep, stays low through your deepest sleep, and rises again before you wake. A thermostat held at one number all night works against that. CircadiaOS builds a temperature curve for your night and drives your smart thermostat to follow it. Connect a wearable and the curve adapts to your own recorded nights instead of a general model. HOW IT WORKS - Connect your thermostat and your wearable - CircadiaOS builds a curve from your profile on night one - As your nights accumulate, the curve shifts to your own data - See exactly which parts come from your sleep and which are still estimates WHAT YOU SEE - Tonight's schedule, phase by phase - Why each setpoint is what it is - Your best and worst nights, side by side, and what differed Requires a compatible smart thermostat. A wearable is optional but unlocks personalization from your own sleep data. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Ratings & reviews
3.5
11 ratings
What’s new
Version 1.7.11 · Updated October 4, 2026
- New on Home: a card for nights after drinking. It shows in the evening and overnight, from a few hours before bedtime until the next morning. On any plan, tapping Run tonight notes the night as a night after drinks. - With Premium and a connected thermostat, it can also run a cooler curve for that night only, and tonight's curve on Home shows it. Your normal curve is back the next night. - Before you confirm, it tells you whether your curve will change. You can start it after you're already in bed, and turn it off with one tap. - Morning check-in: if you didn't turn it off before bedtime, your alcohol answer is filled in for you to keep or change. If the cooler curve was on for the night, there's one optional question comparing the night to other nights after drinks. - Connecting a thermostat now starts with the list of supported brands, so you can see yours before subscribing. - Supported thermostats are listed the same way everywhere in the app. - Bug fixes.
App privacy
The developer, CircadiaOS LLC, reported these privacy practices to Apple.
Data Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Purchases: Purchase History
- Identifiers: Device ID
- Usage Data: Product Interaction
Data Linked to You
The following data, which may be collected and linked to your identity, may be used for the following purposes:
- Identifiers: Device ID, User ID
- Health & Fitness: Health, Fitness
- Location: Coarse Location
- Usage Data: Product Interaction
- Purchases: Purchase History
- Contact Info: Email Address, Name
- User Content: Other User Content
Used for: Third-Party Advertising, Developer’s Advertising or Marketing, Analytics, Product Personalization, App Functionality
Data Not Linked to You
The following data, which may be collected but is not linked to your identity, may be used for the following purposes:
- Purchases: Purchase History
- Usage Data: Product Interaction
- Diagnostics: Crash Data
Used for: Third-Party Advertising, Analytics, App Functionality
Alternatives to CircadiaOS: Sleep Tracker
Looking for apps like CircadiaOS: Sleep Tracker? Here are 6 similar apps on the App Store. The highest rated is Klyft: AI Health & Recovery (5.0/5), and all 6 are free to download.
-
ShiftNight: Sleep Tracker
4.9
-
Aurora Wellness by Mark
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Yawn: Sleep Tracker
4.6
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Stress Platform: HRV Readiness
4.7
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Clarity: Health & Lab Insights
4.8
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Klyft: AI Health & Recovery
5.0
| App | Rating | Price | Last updated | Compare |
|---|---|---|---|---|
| CircadiaOS: Sleep Tracker | 3.5 / 5 (11 ratings) | Free | October 4, 2026 | |
| ShiftNight: Sleep Tracker | 4.9 / 5 (58) | Free | Sep 15, 2026 | Compare |
| Aurora Wellness by Mark | – | Free | Oct 3, 2026 | Compare |
| Yawn: Sleep Tracker | 4.6 / 5 (10) | Free | Aug 26, 2026 | Compare |
| Stress Platform: HRV Readiness | 4.7 / 5 (19) | Free | Oct 10, 2026 | Compare |
| Clarity: Health & Lab Insights | 4.8 / 5 (18) | Free | Oct 1, 2026 | Compare |
| Klyft: AI Health & Recovery | 5.0 / 5 (1) | Free | Oct 9, 2026 | Compare |