# Sleep Calculator - SleepCal — Cycle Alarm & Nap Timer

> Cycle Alarm & Nap Timer (iPhone/iPad app by 华清 沈.)

- Source: https://appshunter.io/ios/app/sleep-calculator/id6757147036 (this page in markdown: same URL + `.md`)
- Developer: [华清 沈](https://appshunter.io/developer/1825423399)
- Category: Health & Fitness, Lifestyle
- Price: Free
- Age rating: 4+
- Requires: iOS 16.6 · 20 MB
- Languages: American English
- Released: 2026-01-23
- Data updated: 2026-02-07
- User reviews in markdown: https://appshunter.io/ios/app/sleep-calculator/id6757147036/reviews.md

## What is Sleep Calculator?

Tired of waking up exhausted?

It's not about sleeping longer—it's about waking up at the RIGHT time.

Your brain cycles through 90-minute sleep stages. Wake up mid-cycle, and you'll feel groggy. Wake at the end of a cycle, and you'll feel refreshed. SleepCal calculates the perfect time for you.


HOW IT WORKS
【WAKE UP MODE】
Tell us when you need to wake up. We'll show you the 3 best times to fall asleep—each aligned with a complete sleep cycle.

【SLEEP NOW MODE】
Going to bed now? We'll calculate the ideal wake times so you rise naturally refreshed.

【POWER NAP】
Need a quick recharge? Our smart nap timer helps you rest without oversleeping or ruining your night.


FEATURES
• Sleep Cycle Calculator based on 90-minute science
• 40+ nature sounds & white noise for faster sleep
• Custom alarm sounds—import your own music (Pro)
• Reliable wake-up with Time-Sensitive Notifications
• Apple Watch support for silent alarms
• Minimalist dark UI—easy on your eyes at night
• Privacy-first: all data stays on your device


WHY SLEEEPCAL?
We don't track your sleep. We don't need sensors.
Just pure, science-based calculation to help you wake up feeling human again.

Download now. Wake up better tomorrow.


ABOUT SUBSCRIPTIONS
SleepCal Premium unlocks custom alarms, exclusive sounds, and cloud sync.
• Monthly: $4.99/month
• Yearly: $19.99/year (Save 67%)

Payment charged to iTunes Account. Auto-renews unless canceled 24h before period ends. Manage in Account Settings.
Privacy: https://aipromptant.com/sleepcal/privacy-policy
Terms: https://www.apple.com/legal/internet-services/itunes/dev/stdeula


## Version history (last 4 releases)

### 1.0.4 — 2026-02-06

• Improved app stability and performance
• Minor bug fixes

### 1.0.3 — 2026-02-02

1.Refined onboarding experience for new users
2.Quick access to Pro features from the home screen
3.Bug fixes and performance improvements

### 1.0.2 — 2026-01-25

Personalized Wake-Up Experience: You can now import your favorite music or record voice memos from loved ones to create a truly personal alarm.

### 1.0.0 — 2026-01-23

No release notes.

## More apps by 华清 沈

- [iHeadshot: AI Headshot Maker](https://appshunter.io/ios/app/iheadshot/id6754013967)
- [Photo Compressor - Shrink Pic](https://appshunter.io/ios/app/photo-compressor/id6758235953)
- [Fast PDF Maker: Image to PDF](https://appshunter.io/ios/app/fast-pdf-maker/id6758765157)
- [PDF Compressor: Shrink files](https://appshunter.io/ios/app/pdf-compressor/id6759241167)

All apps by 华清 沈: https://appshunter.io/developer/1825423399

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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 2026-02-07.*