# Sleep Calculator: Cycle Alarm — Wake up with smart timing

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

- Source: https://appshunter.io/ios/app/sleep-calculator-cycle-alarm/id6747650151 (this page in markdown: same URL + `.md`)
- Developer: [凤英 刘](https://appshunter.io/developer/1822180550)
- Category: Health & Fitness, Lifestyle
- Price: Free with in-app purchases
- Rating: 5.00/5 from 1 App Store ratings · 1 written reviews indexed
- Age rating: 4+
- Requires: iOS 16.6 · 127 MB
- Languages: English, French, German, Italian, Japanese, Korean, Chinese, Chinese
- Released: 2025-06-29
- Data updated: 2026-06-27
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/sleep-calculator-cycle-alarm/id6747650151/reviews.md

## What is Sleep Calculator?

Sleep Better Tonight

Fall asleep peacefully, wake up refreshed, and plan your perfect sleep schedule with smart sleep cycle calculations and calming sleep sounds.

helps you align your sleep with natural 90-minute sleep cycles so you can wake up feeling more rested and energized.

Wake up feeling refreshed.

Sleep Cycle Calculator helps you choose the best time to fall asleep or wake up based on your body's natural sleep cycles.

Whether you're going to bed now or planning a wake-up time for tomorrow, this app helps you align your sleep with 90-minute sleep cycles to minimize grogginess.

Features:

1.Tap "Sleep Now" to get recommended wake-up times

2.Choose a wake-up time to see when you should fall asleep

3.Set smart reminders to never miss the ideal sleep window

Based on proven sleep science, this app is perfect for students, professionals, night owls, or anyone looking to improve sleep quality.

Start sleeping smarter today.


Legal
Terms of Use: https://sleep.leaphealth.fitness/privacypolicy.html
Privacy Policy:https://www.apirox.com/contact.php

## Key features

- Smart sleep cycle calculations
- Recommended wake-up times
- Optimal sleep time suggestions
- Calming sleep sounds
- Smart reminders

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Weekly Member | $3.99 | one-time |
| Monthly Member | $9.99 | one-time |
| Yearly Member | $29.99 | one-time |


## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/sleep-calculator-cycle-alarm/id6747650151/reviews.md

### 5/5 — the best sleep and relaxation apps I’ve used — easy 5 stars

*2026-05-08*

I’ve tried a lot of sleep apps, but this one feels genuinely thoughtful.
The sleep cycle planner helps me choose the best time to sleep or wake up based on natural 90-minute cycles, and I wake up feeling much less groggy.

**Developer response:** Thank you so much for the thoughtful feedback!

## Frequently asked questions about Sleep Calculator

### How does Sleep Calculator determine the best wake-up times?

Sleep Calculator uses principles of sleep science to align your sleep with natural 90-minute sleep cycles. It recommends wake-up times that aim to minimize grogginess and help you feel more refreshed.

### Can Sleep Calculator help me fall asleep faster?

Yes, by suggesting optimal times to fall asleep based on your desired wake-up time and natural sleep cycles, Sleep Calculator aims to improve your overall sleep efficiency and reduce the time it takes to fall asleep.

### What kind of sounds does Sleep Calculator offer?

The app provides calming sleep sounds designed to help users fall asleep peacefully. Specific details on the types of sounds are not provided in the description.

### Does Sleep Calculator have ads?

No, Sleep Calculator is ad-free, allowing for an uninterrupted user experience focused on improving sleep.

### What devices does Sleep Calculator support?

Currently, Sleep Calculator is supported on iPhone devices. Information regarding Android or other platform compatibility is not available.

### How often is Sleep Calculator updated?

The latest version, 1.2.0, was last updated on June 15, 2026. While specific update frequency isn't detailed, this indicates recent development activity.

### What is the age rating for Sleep Calculator?

Sleep Calculator has an age rating of 4+, making it suitable for a wide range of users.

### Is Sleep Calculator free to use?

Yes, Sleep Calculator is available for free. There are no in-app purchases mentioned, suggesting all core features are accessible without cost.

## Version history (last 4 releases)

### 1.2.0 — 2026-06-15

Fresh new UI with a cleaner and more elegant sleep experience

### 1.1 — 2026-05-07

Fresh new UI with a cleaner and more elegant sleep experience

### 1.0.1 — 2025-07-07

fix bug

### 1.0 — 2025-06-30

No release notes.

## Apps similar to Sleep Calculator

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [XLCare](https://appshunter.io/ios/app/xlcare/id6744706064) | — | Free | Health & Fitness |
| [Redi - Doctor Appointment Prep](https://appshunter.io/ios/app/redi-doctor-appointment-prep/id6751351553) | — | Free | Health & Fitness |
| [Sleep Cycle Simple Calculator](https://appshunter.io/ios/app/sleep-cycle-simple-calculator/id6756280217) | — | Free | Health & Fitness |
| [WakeCycle: Sleep Cycle Alarm](https://appshunter.io/ios/app/wakecycle-sleep-cycle-alarm/id6760021055) | — | Free | Health & Fitness |
| [Smart Sleep Calculator](https://appshunter.io/ios/app/smart-sleep-calculator/id6744327999) | — | Free | Health & Fitness |
| [Sleep Calculator - Wake Up](https://appshunter.io/ios/app/sleep-calculator-wake-up/id6744512529) | — | Free | Health & Fitness |

## More apps by 凤英 刘

- [MangaTrans: AI Translator](https://appshunter.io/ios/app/mangatrans-ai-translator/id6749008967)
- [DualShot Camera: Dual Format](https://appshunter.io/ios/app/dualshot-camera-dual-format/id6768878556)
- [FlowTrans: Screen Translator](https://appshunter.io/ios/app/flowtrans-screen-translator/id6770569948)
- [Sober Garden: Quit Tracker](https://appshunter.io/ios/app/sober-garden-quit-tracker/id6771756706)

All apps by 凤英 刘: https://appshunter.io/developer/1822180550

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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 2026-06-27.*