# Yawn vs CircadiaOS

The clearest difference is rating: Yawn at 4.6 against CircadiaOS's 3.5. Yawn also leads on review sentiment (100% vs 75%) and iOS requirement (16.0 vs 18.0). CircadiaOS's advantage is monetization model (free with in-app purchases vs subscription) and update cadence (every 3 days vs weekly). On price, ratings volume, ads and in-app purchases there is nothing between them.

Both are free to download. Yawn sells 4 in-app purchases, starting at $6.99 per 7 days and CircadiaOS sells 4 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

Yawn holds the better App Store score, 4.6 against 3.5. Both are backed by a comparable volume of ratings — 10 and 11 respectively. Written reviews point the same way: 100% of Yawn's written reviews are positive against 75% of CircadiaOS's.

Yawn ships an update weekly, CircadiaOS every 3 days. The most recent releases landed on October 28, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Yawn | CircadiaOS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (10 ratings)](https://appshunter.io/ios/app/yawn-sleep-tracker/id6759587180/reviews)** | [3.5 (11 ratings)](https://appshunter.io/ios/app/circadiaos-sleep-tracker/id6761959749/reviews) |
| Number of ratings | 10 | **11** |
| Positive reviews | **100.0% of reviews** | 75.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | Weekly | **Every 3 days** |
| Monetization | Subscription | **Free with in-app purchases** |
| Size | 91 MB | 25 MB |
| Requires iOS | **16.0** | 18.0 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 17+ |
| Developer | [clvr](https://appshunter.io/developer/1737492618) | [CircadiaOS LLC](https://appshunter.io/developer/1892208236) |

## What reviewers say

### Yawn

[App page](https://appshunter.io/ios/app/yawn-sleep-tracker/id6759587180)

This app tracks your sleep patterns to help you understand your personal sleep needs and calculate your sleep debt. It provides a daily sleep score and insights into your bedtime regularity, all personalized to your goals.

**Highlights:** Sleep score tracking, Personalized sleep debt calculation, Identifies individual sleep needs, Monitors bedtime regularity, Integrates with Apple Health, Personalized goal-based quizzes

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $6.99 | per 7 days |
| Annual | $24.99 | per year |
| Annual | $39.99 | per year |
| Annual | $49.99 | per year |


### CircadiaOS

[App page](https://appshunter.io/ios/app/circadiaos-sleep-tracker/id6761959749)

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.

**Highlights:** 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

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| CircadiaOS Lite Monthly | $9.99 | per month |
| CircadiaOS | $19.99 | per month |
| CircadiaOS Lite Yearly | $99.99 | per year |
| CircadiaOS | $159.99 | per year |


## Frequently asked questions

### Is Yawn free?

Yawn is free to download, with in-app purchases available.

### Is CircadiaOS free?

CircadiaOS is free to download, with in-app purchases available.

### Which has better reviews, Yawn or CircadiaOS?

Yawn is rated higher. Yawn averages 4.6 out of 5 from 10 ratings, while CircadiaOS averages 3.5 from 11 ratings.

### Do Yawn or CircadiaOS have ads?

Both Yawn and CircadiaOS show ads.

### Which is updated more often, Yawn or CircadiaOS?

Yawn ships an update weekly, and CircadiaOS every 3 days. Most recently, Yawn was updated on October 28, 2026 and CircadiaOS on October 24, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*