Rhythm Lighting vs CircadiaOS
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Rhythm Lighting
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PERFORMANCE LIGHTING Light shapes how you show up. Clear mornings. Steady energy through the day. Sharper focus when it matters. Easier wind-down at night. Deeper, more consistent sleep. Rhythm brings your environment into alignment with your natural rhythm—so your body and mind perform the way they’re supposed to. Wake better. Work better. Recover better. Compatible with Philips Hue, Rhythm Server, and Home Assistant. Learn more: https://rhythm.lighting
CircadiaOS
This app learns your body's ideal sleep temperature and automatically adjusts your smart thermostat throughout the night. It uses data from your wearable to personalize a four-phase temperature schedule for optimal sleep recovery. Requires a compatible smart thermostat and sleep-tracking wearable.
- Learns ideal sleep temperature
- Personalized four-phase temperature schedule
- Integrates with smart thermostats
- Syncs with sleep-tracking wearables
- Analyzes sleep quality
- Two-week calibration period
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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/
Screenshots
Verdict
The clearest difference is in-app purchases: Rhythm Lighting at none against CircadiaOS's 4. Rhythm Lighting also leads on ads (none vs shown) and iOS requirement (15.0 vs 18.0). CircadiaOS's advantage is update cadence (every 3 days vs every 2 weeks). On price and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. CircadiaOS sells 4 in-app purchases, starting at $9.99 per month. Rhythm Lighting asks for nothing beyond the download.
Rhythm Lighting ships an update every 2 weeks, CircadiaOS every 3 days. Both last shipped on October 24, 2026.
| Parameter | Rhythm Lighting | CircadiaOS |
|---|---|---|
| Price | Free | Free |
| Rating | — | 3.5 (11 ratings) — better |
| Positive reviews | — | 75.0% of reviews |
| Number of ratings | — | 11 — better |
| Update frequency | Every 2 weeks | Every 3 days — better |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | — | Free with in-app purchases |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 18.0 |
| Further details — not scored | ||
| Size | 37 MB | 25 MB |
| Age rating | 4+ | 17+ |
| Developer | DT Concepts, LLC | CircadiaOS LLC |
In-app purchases
Rhythm Lighting
No in-app purchases
CircadiaOS
- CircadiaOS Lite Monthly$9.991 Month
- CircadiaOS1 Month trial$19.991 Month
- CircadiaOS Lite Yearly$99.991 Year
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- CircadiaOS1 Month trial$159.991 Year
