# ShiftNight vs CircadiaOS

The clearest difference is rating: ShiftNight at 4.9 against CircadiaOS's 3.8. ShiftNight also leads on ads (none vs shown) and review sentiment (100% vs 75%). CircadiaOS's advantage is monetization model (free with in-app purchases vs subscription). On price, update cadence, in-app purchases and device support there is nothing between them.

Both are free to download. ShiftNight sells 11 in-app purchases, starting at $8.99 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.

ShiftNight holds the better App Store score, 4.9 against 3.8. That said, the two scores are not equally well evidenced: ShiftNight has 54 ratings behind it against 10, so its average is the more settled of the two. Written reviews point the same way: 100% of ShiftNight's written reviews are positive against 75% of CircadiaOS's.

ShiftNight ships an update every 5 days, CircadiaOS every 3 days. The most recent releases landed on October 11, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | ShiftNight | CircadiaOS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (54 ratings)](https://appshunter.io/ios/app/shiftnight-sleep-tracker/id6761045529/reviews)** | [3.8 (10 ratings)](https://appshunter.io/ios/app/circadiaos-sleep-tracker/id6761959749/reviews) |
| Number of ratings | **54** | 10 |
| Positive reviews | **100.0% of reviews** | 75.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 5 days | **Every 3 days** |
| Monetization | Subscription | **Free with in-app purchases** |
| Size | 196 MB | 25 MB |
| Requires iOS | **17.4** | 18.0 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 17+ |
| Developer | [HAVEN VU](https://appshunter.io/developer/1887485099) | [CircadiaOS LLC](https://appshunter.io/developer/1892208236) |

## What reviewers say

### ShiftNight

[App page](https://appshunter.io/ios/app/shiftnight-sleep-tracker/id6761045529)

This app creates personalized sleep plans for individuals with irregular schedules. It provides recommendations for sleep, caffeine intake, and naps based on your unique daily routine, helping you optimize rest and recovery.

**Highlights:** Personalized sleep plans, Schedule-aware recommendations, Caffeine timing guidance, Nap planning, Sleep tracking, Recovery day transitions

**Features:** macOS Compatibility

**In-app purchases (11)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $8.99 | per 7 days |
| Weekly | $9.99 | per 7 days |
| Monthly | $14.99 | per month |
| Annual | $29.99 | per year |
| Annual | $39.99 | per year |
| Annual | $49.99 | per year |
| Annual | $59.99 | per year |
| Annual | $59.99 | per year |
| Annual | $59.99 | per year |
| Annual | $69.99 | per year |
| Lifetime | $69.99 | one-time |


### 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 ShiftNight free?

ShiftNight 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, ShiftNight or CircadiaOS?

ShiftNight is rated higher. ShiftNight averages 4.9 out of 5 from 54 ratings, while CircadiaOS averages 3.8 from 10 ratings.

### Do ShiftNight or CircadiaOS have ads?

CircadiaOS shows ads; ShiftNight does not.

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

ShiftNight ships an update every 5 days, and CircadiaOS every 3 days. Most recently, ShiftNight was updated on October 11, 2026 and CircadiaOS on October 7, 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.*