# Sleep Calculator Pro vs Cosmic Flows

The clearest difference is update cadence: Cosmic Flows at every 2 weeks against Sleep Calculator Pro's every 7 months. Sleep Calculator Pro's advantage is ratings volume (76 vs 1). On price, rating, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 5.0 for Sleep Calculator Pro against 5.0 for Cosmic Flows. That said, the two scores are not equally well evidenced: Sleep Calculator Pro has 76 ratings behind it against 1, so its average is the more settled of the two.

Sleep Calculator Pro ships an update every 7 months, Cosmic Flows every 2 weeks. The most recent releases landed on October 21, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Sleep Calculator Pro | Cosmic Flows |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (76 ratings)](https://appshunter.io/ios/app/sleep-calculator-pro/id1416795317/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/cosmic-flows/id6757113980/reviews)** |
| Number of ratings | **76** | 1 |
| Positive reviews | 93.8% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 2 weeks** |
| Monetization | Free | Free |
| Size | 24 MB | 20 MB |
| Requires iOS | 16.4 | **15.6** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [DealWatch24 LLC](https://appshunter.io/developer/1366306458) | [heroRocket() Games LLC](https://appshunter.io/developer/1435200791) |

## What reviewers say

### Sleep Calculator Pro

[App page](https://appshunter.io/ios/app/sleep-calculator-pro/id1416795317)

This app helps you determine the optimal times to go to sleep and wake up to align with your natural 90-minute sleep cycles. It calculates ideal bedtime based on your desired wake-up time and vice-versa, promoting a more rested feeling upon waking. It also includes features for tracking sleep phases and a smart alarm to wake you gently.

**Highlights:** Calculate best time to go to sleep, Calculate best time to wake up, Track and analyze sleep cycles, Identify light, deep, and REM sleep phases, Smart alarm for gentle wake-ups, Bedtime notifications

**Features:** Vision Pro support

**In-app purchases:** none


### Cosmic Flows

[App page](https://appshunter.io/ios/app/cosmic-flows/id6757113980)

This app offers a guided breathing experience with immersive cosmic visuals to help reduce stress, improve focus, and prepare for sleep. It features customizable breathing rhythms and flexible session lengths, all within a battery-efficient dark mode interface.

**Highlights:** Immersive cosmic visuals, Customizable breathing rhythms, Flexible session lengths, Dark mode interface, Battery efficient design, Stress reduction, Focus improvement

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Sleep Calculator Pro free?

Sleep Calculator Pro is free to download, with no in-app purchases.

### Is Cosmic Flows free?

Cosmic Flows is free to download, with no in-app purchases.

### Which has better reviews, Sleep Calculator Pro or Cosmic Flows?

Cosmic Flows is rated higher. Sleep Calculator Pro averages 5.0 out of 5 from 76 ratings, while Cosmic Flows averages 5.0 from 1 ratings.

### Do Sleep Calculator Pro or Cosmic Flows have ads?

Neither Sleep Calculator Pro nor Cosmic Flows shows ads.

### Which is updated more often, Sleep Calculator Pro or Cosmic Flows?

Sleep Calculator Pro ships an update every 7 months, and Cosmic Flows every 2 weeks. Most recently, Sleep Calculator Pro was updated on October 21, 2026 and Cosmic Flows on October 30, 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.*