Comparison

Sleep Calculator Pro vs Cosmic Flows

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Sleep Calculator Pro

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
Read full description

Good day starts with good morning! Go to bed at the right time and wake up in between your natural 90-minute sleep cycles to feel rested and refreshed. A good night's sleep consists of 5-6 complete sleep cycles. ◦ Select when you want to wake up ◦ Calculate your best time to go to sleep ◦ Calculate the best time to wake up It takes an average human about 15 minutes to fall asleep. If you wake up at one of the calculated times, you'll rise in between 90-minute sleep cycles. Sleep Calculator helps you decide when to go to bed so that you can wake at a specific time ensuring a good night’s rest, or what time you should wake up if you want to go to bed right now. If you want to determine your real sleep cycles - our Sleep Tracker functionality allows you to track and analyze your sleep and, if done correctly, will show you your sleep progress – when you were in light, deep or REM (dream) sleep phase and the breakdown of your sleep cycles. Snoring/noise detection can be enabled as well. Our Smart Alarm will wake you up gently in the lightest sleep phase, making sure you wake up easy and rested. Bedtime notifications can also be set up so that you do not miss a proper time to go to sleep.

About

Cosmic Flows

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
Read full description

Find your calm in the cosmos. Cosmic Flow Breath is more than just a meditation timer—it is an immersive visual journey designed to align your body’s natural rhythm with the flow of the universe. Whether you need a quick reset during a stressful day or a deep session to unwind before sleep, Cosmic Flow guides you effortlessly through the noise. Why Cosmic Flow? In our fast-paced world, we often forget to breathe. Cosmic Flow uses scientifically-proven rhythmic breathing techniques wrapped in a stunning, dark-mode-first cosmic interface. Watch as glowing nebulas expand and contract with your lungs, creating a powerful visual anchor that keeps your mind focused and your body relaxed. Key Features: Immersive Visuals Drift away with high-definition nebula backgrounds and a glowing, rhythmic interface that pulses with life. The dark design is optimized for OLED screens, making it perfect for night-time relaxation. Customizable Rhythm Everyone breathes differently. Use the intuitive "Pace" slider to find your perfect flow—from rapid energizing breaths to deep, slow, meditative cycles. Flexible Sessions Have one minute or five? Set your session length instantly. The interface fades away, leaving only you and your breath until the journey is complete. Battery Friendly Built with efficiency in mind, using a dark theme that saves energy while you recharge yours. Perfect For: Reducing Anxiety & Stress Improving Focus & Clarity Sleep Preparation Mindfulness Beginners & Experts Download Cosmic Flow Breath today and turn every breath into a journey.

Screenshots

Sleep Calculator Pro4 screens
Cosmic Flows4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard2 real differences · 8 level
Sleep Calculator Pro versus Cosmic Flows: the parameters behind the verdict, then further details
ParameterSleep Calculator ProCosmic Flows
PriceFreeFree
Rating5.0 (76 ratings)5.0 (1 ratings) — better
Positive reviews93.8% of reviews—
Number of ratings76 — better1
Update frequencyEvery 7 monthsEvery 2 weeks — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS16.415.6 — better
Further details — not scored
Size24 MB20 MB
Age rating4+4+
DeveloperDealWatch24 LLCheroRocket() Games LLC

Customer experience

Sleep Calculator Pro

All ratings76 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews32 reviews
Positive93.8%
Neutral6.3%
Negative0.0%

Cosmic Flows

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Sleep Calculator Pro

No in-app purchases

None

Cosmic Flows

No in-app purchases

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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