# Sleep Calculator Pro

> Calculates optimal sleep and wake times based on 90-minute sleep cycles. (iPhone/iPad app by DealWatch24 LLC.)

- Source: https://appshunter.io/ios/app/sleep-calculator-pro/id1416795317 (this page in markdown: same URL + `.md`)
- Developer: [DealWatch24 LLC](https://appshunter.io/developer/1366306458)
- Category: Health & Fitness
- Price: Free
- Rating: 5.00/5 from 75 App Store ratings · 32 written reviews indexed
- Age rating: 4+
- Requires: iOS 12.4 · 13 MB
- Languages: American English
- Released: 2018-08-02
- Data updated: 2026-08-23
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/sleep-calculator-pro/id1416795317/reviews.md

## What is Sleep Calculator Pro?

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 brand new Smart Alarm will wake you up easy 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.

## Key features

- 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

## Recent user reviews (10 of 32)

All indexed reviews: https://appshunter.io/ios/app/sleep-calculator-pro/id1416795317/reviews.md

### 5/5 — Everything I want

*2026-02-03, version 1.2.116*

Exactly everything I want, practical

### 5/5 — straight forward, easy to use

*2024-12-13, version 1.2.116*

no adds, no bright screen. Open the app. Put in the time I want to wake up and hit calculate bedtime.

### 3/5 — Why no integration with Apple Health app ?

*2023-10-11, version 1.2.34*

I’m Loving the Sleep Calculator Pro. Its lightweight, has all the necessary functionalities however there is one very crucial feature that has become a deal breaker for me & even my friend, its not integrated with the Apple health app. The health app can’t access its data and copy my sleep hours to itself. I have to now manually into my hours in the health app every morning, there are plenty other apps that does this one simple thing automatically. I don’t need an integration with any wearable just the basic Apple Health app.

### 5/5 — 10/10

*2023-08-10, version 1.2.34*

I Love this app!

### 5/5 — W app

*2023-07-31, version 1.2.34*

I slept like a log

### 5/5 — Apple Watch

*2022-09-30, version 1.2.34*

Сделайте пожалуйста для часов

### 3/5 — App does the job

*2021-12-30, version 1.2.26*

Don’t understand why a bright blue display would be suitable for an app that you would most likely visit just before sleeping

### 5/5 — Review

*2021-07-29, version 1.2.26*

This app is free and one of the best out ther and is for freeee and has all the trends and stats.

### 5/5 — everyone needs this !!

*2021-07-20, version 1.2.26*

once you use this it becomes an everyday habit !! i love this and recommend anyone and everyone to use it :)

### 5/5 — best app you can get for smart alarm

*2021-02-02, version 1.2.25*

I usually never write reviews for apps, but this app is just so amazing that I felt obligated to. 

It’s a super simple interface, and it has all the information you need to calculate when to go to sleep/wake up. It also tracks your sleep through sound and movement (which I don’t utilize as much, because sleep trackers tend to be a bit inaccurate at times). You can set up notifications to remind you when you should sleep and I prefer it over the default bedtime feature. And all of this is free!!

## Frequently asked questions about Sleep Calculator Pro

### What does the Sleep Calculator Pro app do?

This app helps you determine the best times to go to sleep and wake up to maximize rest. It calculates these times based on natural 90-minute sleep cycles, aiming to wake you during a lighter sleep phase for a more refreshed feeling. It also includes sleep tracking and a smart alarm.

### How does the sleep cycle calculation work?

The app assumes a human takes about 15 minutes to fall asleep and that a good night's sleep consists of 5-6 complete 90-minute sleep cycles. By selecting your desired wake-up time, it calculates the ideal bedtime, or vice-versa, to ensure you wake up between these cycles.

### Is Sleep Calculator Pro free to use?

Yes, the application is available for free. There are no in-app purchases or advertisements mentioned, suggesting a completely free experience for users.

### What are the key features of this sleep app?

Key features include calculating your best time to go to sleep and wake up, tracking and analyzing your sleep cycles (light, deep, REM), a smart alarm that wakes you in the lightest sleep phase, and bedtime notifications to help you maintain a consistent sleep schedule.

### Who would benefit from using this app?

Anyone who struggles with waking up feeling tired or wants to optimize their sleep schedule would benefit. It's particularly useful for individuals who want to understand and work with their natural sleep patterns to improve overall well-being and energy levels.

## Version history (last 5 releases)

### 1.2.116 — 2024-03-27

- bug fixes and improvements

### 1.2.34 — 2022-09-08

- ability to customize sleep cycle length

### 1.2.26 — 2021-05-07

- microphone-based sleep tracking and smart alarm
- varios fixes and improvements

### 1.2.25 — 2020-10-05

- ability to back up sleep data to iCloud Drive (iOS 10+)
- bug fixes and improvements

### 1.2.24 — 2020-09-06

- sleep sharing
- sleep editing
- sleep sounds
- hold button to stop sleep tracking
- bug fixes

## Apps similar to Sleep Calculator Pro

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Pillow: Sleep Tracker](https://appshunter.io/ios/app/pillow-sleep-tracker/id878691772) | 4.4 (95,615) | Free | Health & Fitness |
| [Avrora Sleep Sounds & Stories](https://appshunter.io/ios/app/avrora-sleep-sounds-and-stories/id1441091033) | 4.5 (17,920) | Free | Health & Fitness |
| [BetterSleep: Relax and Sleep](https://appshunter.io/ios/app/bettersleep-relax-and-sleep/id314498713) | 4.7 (390,600) | Free | Health & Fitness |
| [Sleep Cycle - Tracker & Sounds](https://appshunter.io/ios/app/sleep-cycle-tracker-and-sounds/id320606217) | 4.7 (28,142) | Free | Health & Fitness |
| [Sleep Time+ Cycle Alarm Clock](https://appshunter.io/ios/app/sleep-time-plus-cycle-alarm-clock/id498360026) | 4.8 (2,483) | Free | Health & Fitness |
| [Sleep Time: Cycle Alarm Clock](https://appshunter.io/ios/app/sleep-time-cycle-alarm-clock/id555564825) | 4.7 (5,369) | Free | Health & Fitness |

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-23.*