Soul Flow vs CircadiaOS
A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.
Soul Flow compared with CircadiaOS
| Detail | 
Soul Flow | 
CircadiaOS |
|---|
| What it does | Human Design app with free chart, daily practices, lessons and AI coach
| The thermostat schedule that learns from your sleep
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| Stage | Startup
| Not given
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| Founded | 2025
| Not given
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| Based in | IL
| US
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| Pricing model | Freemium
| Freemium
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| Pricing | Not given
| 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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| Key features | - Free BodyGraph chart generation
- Today's Thread daily 2-minute practice
- Compatibility chart comparison
- AI Soul Coach
- Week Ahead transit forecast
- Decision journal
- Guided breathwork and rituals
- Bilingual content in English and Hebrew
| - 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
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| What makes it different | - Accurate calculations based on Swiss Ephemeris astronomical data
- Privacy-first approach with no data selling
- Truly bilingual in English and Hebrew, not machine-translated
- Practical daily guidance aligned with your design
- AI coach personalized to your chart and transits
| - No new hardware required—works with your existing smart thermostat and wearable
- Software-first approach running sleep algorithms on your thermostat rather than requiring specialized cooling beds
- Personalization through one-change-at-a-time adjustments graded against your own sleep data
- Complete transparency showing where every setpoint comes from and how much data supports it
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 4 ▲ +2 (up) since last check | 13 ● no change since last check |
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| Trust Flow (Majestic) | 2 | 4 |
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| Citation Flow (Majestic) | 25 | 24 |
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| Referring domains (Majestic) | 33 | 47 |
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5 details filled in for both companies.
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