# Sleep Time Calculator — Get the sleep you deserve

> Calculates ideal wake-up times based on sleep cycles. (iPhone/iPad app by Recked Software LLC.)

- Source: https://appshunter.io/ios/app/sleep-time-calculator/id606077861 (this page in markdown: same URL + `.md`)
- Developer: [Recked Software LLC](https://appshunter.io/developer/606077864)
- Category: Utilities, Health & Fitness
- Price: Free
- Rating: 3.70/5 from 22 App Store ratings · 33 written reviews indexed
- Age rating: 12+
- Requires: iOS 8.0 · 55 MB
- Languages: American English
- Released: 2013-02-26
- Data updated: 2026-06-11
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/sleep-time-calculator/id606077861/reviews.md

## What is Sleep Time Calculator?

Know the best possible times to wake up with this free app.

The five stages of sleep, including their repetition, occur cyclically. The first cycle, which ends after the completion of the first REM stage, usually lasts for 90 minutes.

With 8 hours of sleep you typically go through 4-5 cycles a night.  Waking up in the middle of a cycle leaves you feeling groggy, but waking up at the end of a cycle leaves you feeling awake and alert.  This app gives you recommendations on when to wake up in the morning to decrease the likelihood that you will feel groggy.

## Key features

- Optimal wake-up time recommendations
- Sleep cycle analysis
- Reduces grogginess
- Promotes alertness
- Free to use

## Recent user reviews (10 of 33)

All indexed reviews: https://appshunter.io/ios/app/sleep-time-calculator/id606077861/reviews.md

### 5/5 — I use this every night for years

*2026-03-27, version 2.0.1*

Shows different times based on sleep cycles. I use it every night I absolutely love it with my heart

### 5/5 — The best app that solely does what it's supposed to do

*2024-04-14, version 2.0.1*

I love this app for just literally telling me the time to wake up and when to sleep. Other apps requires in app purchases and bunch of features I dont even need, but this app is sooo simple to use that I check time, set alarm, and go right to sleep. Thanks for amazing app

### 5/5 — been using for years now

*2023-04-08, version 2.0.1*

been using for years now great to use simple

### 4/5 — Simple and effective

*2022-11-04, version 2.0.1*

I was looking for a simple aap which lets me calculate my best sleeping time as per sleep cycle. This aap does the job.

### 1/5 — It’ll save information from your phone

*2022-07-12, version 2.0.1*

When you enter the app and you have copied text in your clipboard, this app saves that information without asking.

Messed up

### 5/5 — Simple and effective

*2021-08-05, version 2.0.1*

i use this app all the time! completely free, and no unnecessary bells and whistles. been using it for years and don’t see myself switching.

### 1/5 — Can’t set my wake up time

*2020-08-30, version 2.0.1*

unfortunately I can’t get this app to set my wake up time so I can figure out the best time to go to bed. I have tried and tried and have just concluded that my energy and time should go to getting another app that actually works.

### 1/5 — Not working out

*2020-04-02, version 2.0.1*

Unfortunately, it doesn’t work.😩
 Every time I try to use the when to go to bed function and try to edit the time it doesn’t update and the banner stays up and won’t go away. If it does update the time it stays up and Can’t see the rest of the go to bed by a certain times

### 1/5 — Overpriced

*2019-11-26, version 2.0.1*

Subscribe What? Everything’s subscription these days. 40 bucks for a year??? Go subscribe a friend for a year plan, man. Miss the good old days when apps were $0.9~9.9

### 4/5 — Planning sleep

*2018-10-11*

Straight forward uncomplicated app which helps me plan my sleep so that I wake refreshed. Has he worked well for me.

## Frequently asked questions about Sleep Time Calculator

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

This app helps you find the best times to wake up in the morning. It analyzes sleep cycles to recommend wake-up times that align with the end of a cycle, aiming to make you feel more awake and less groggy.

### How does the app determine wake-up times?

The app is based on the understanding that sleep occurs in cycles, typically lasting around 90 minutes. Waking up at the end of a cycle, rather than in the middle, leads to feeling more alert. It calculates these optimal end-of-cycle wake-up times.

### Is this app free to use?

Yes, the app is completely free to use. There are no in-app purchases or advertisements mentioned, making it a straightforward, free utility for improving your wake-up routine.

### Who would benefit from using this app?

Anyone who frequently feels groggy or tired upon waking up would benefit. It's particularly useful for individuals who want to optimize their sleep schedule and improve their morning alertness.

## Version history (last 5 releases)

### 2.0.1 — 2017-11-07

This app has been updated by Apple to display the Apple Watch app icon.

- Refresh button actually works now
- Time selector fixes

### 2.0.0 — 2017-11-02

- Updated UI
- 64-bit support
- iOS 11 support
- iPhone X support

### 1.1 — 2013-08-23

- New, simpler design

- Set a remind for when to go to sleep

- Bug fixes

Coming soon:
- Add an alarm for the morning

### 1.0.1 — 2013-03-05

- bug fixes

### 1.0 — 2013-02-26

No release notes.

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## Related topics

[sleep time calculator](https://appshunter.io/ios/topics/sleep-time-calculator) · [free sleep calculator](https://appshunter.io/ios/topics/free-sleep-calculator)

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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 2026-06-11.*