# Sleep Cycle Bedtime Calculator — Wake Up & Bed Time Schedule

> Calculates ideal sleep and wake times based on sleep cycles. (iPhone/iPad app by Kai Oelfke.)

- Source: https://appshunter.io/ios/app/sleep-cycle-bedtime-calculator/id1668639153 (this page in markdown: same URL + `.md`)
- Developer: [Kai Oelfke](https://appshunter.io/developer/644779478)
- Category: Health & Fitness, Utilities
- Price: Free with in-app purchases
- Rating: 4.10/5 from 280 App Store ratings · 77 written reviews indexed
- Age rating: 4+
- Requires: iOS 18.0 · 21 MB
- Languages: American English
- Released: 2023-01-30
- Data updated: 2026-08-29
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/sleep-cycle-bedtime-calculator/id1668639153/reviews.md

## What is Sleep Cycle Bedtime Calculator?

Sleep smarter. Feel more refreshed. Calculate the best time to wake up or when to go to bed. It's based on sleep cycles. They're about 90 minutes each and it's good to get 5-6 cycles. Sleeping at midnight for 5 cycles? Wake up at 7:30 AM. Need to wake up at 6:00 AM, but want 6 cycles? Then hit the bed at 9:00 PM. Not falling asleep immediately? Customize your fall asleep time. PS: Most people need ~ 15 minutes to fall asleep.

- Apple Watch support
- Customize time to fall asleep

Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

## Key features

- Calculate optimal wake-up times
- Calculate optimal bedtime
- Based on 90-minute sleep cycles
- Supports 5-6 sleep cycles
- Customizable fall asleep time
- Apple Watch support

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| SleepCalc Pro Yearly | $4.99 | per year |
| SleepCalc Pro Yearly | $4.99 | per year |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| SleepCalc Pro | $9.99 | one-time |
| SleepCalc Pro | $9.99 | one-time |


## What do users think of Sleep Cycle Bedtime Calculator?

Overall sentiment: positive

**Pros**

- 🆓 Completely free with no ads or data collection
- 👍 Simple and intuitive user interface
- 🎯 Accurate sleep cycle calculations based on 90-minute cycles
- ⚡ Quick and easy to use
- 📊 Shows multiple sleep time options and highlights best choices
- 🔒 Respects user privacy with no data tracking
- 🛏️ Helps improve sleep quality and morning alertness
- ⚙️ Allows flexible adjustment of wake and bedtime settings
- 🎨 Clean, sleek design without clutter

**Cons**

- 😕 Confusing interface for some users
- 🐛 Unresponsive touch controls reported
- 📉 Lacks visual graphs and data visualization
- ❌ No detailed sleep analysis or insights
- 🔄 Settings reset when app is closed
- ⏰ Alarm integration issues
- 📱 Not user-friendly for new users
- 🚫 Limited functionality compared to other sleep trackers
- ❓ Unclear how to interpret displayed information

**Commonly reported bugs**

- Touch screen unresponsive
- App settings reset upon closing
- Alarm goes off at unintended times
- Skips certain time slots in calculations
- Confusing icon similarity with Apple Watch app

**Most requested features**

- Add graphs and visual data representations
- Integrate with Apple Health or Fitbit data
- Display number of sleep cycles achieved
- Built-in alarm functionality
- Persist settings when closing app
- Multi-language support
- Detailed sleep analysis and personalized insights
- Larger, more detailed charts for phone display
- Calculate wake time from current time

## Recent user reviews (10 of 77)

All indexed reviews: https://appshunter.io/ios/app/sleep-cycle-bedtime-calculator/id1668639153/reviews.md

### 5/5 — Simple and works

*2026-07-29*

Straight to the point app that lets me calculate sleep cycles. It’s free too which is the cherry on top. 
Thank you for making this app!

**Developer response:** Thank you! Happy it helps you plan your sleep. Best, Kai

### 5/5 — Perfect

*2026-06-23*

Honestly just what I was looking for.

**Developer response:** Thank you! Best, Kai

### 2/5 — Cancelation

*2026-05-31*

How can I cancel my subscription?  I can no longer afford paying for apps. Please help me.  Thank you.

**Developer response:** To cancel, go to Settings, tap your name, then Subscriptions. All your active subscriptions show up there. If this sorted it out, I'd appreciate it if you updated your rating. Write to kai@amicu.app if you need anything else. Best, Kai

### 5/5 — Works perfectly

*2026-05-31*

Does exactly what you want, no annoying ads, no subscription requirements, no loading. Just a great app

**Developer response:** Thanks for the kind words! Best, Kai

### 5/5 — Sleep

*2026-05-13, version 1.0.10*

I love this App

### 2/5 — Hard  to evaluate what it shows.

*2026-03-17, version 1.0.8*

Confusing.

### 5/5 — My new favorite

*2025-11-29*

I like that it in addition to the times to wake up, shows the number of hours you’ll get, and highlights the two best ones for a full night’s sleep. And I love that it doesn’t collect any data or otherwise compromise user privacy—and that it’s FREE.

**Developer response:** Thank you! Best, Kai

### 5/5 — Mr

*2025-10-21*

Good

**Developer response:** Thank you! Best, Kai

### 5/5 — Perfect

*2025-10-20*

I like how I can easily see what time I should go to bed or what time I should wake up based on my cycles. I have noticed that I’m not as drowsy in the morning (if I follow it and go to bed). It would be cool to eventually be able to see more data from Apple in the app like if my cycles align with the typical 90 minutes but for now I’m not complaining. Thanks for this app!

**Developer response:** Thank you! Best, Kai

### 5/5 — Flexible

*2025-08-21*

I like the ability to change the wake up and going to bed times.  And how it shows how long to sleep!  It helps to know if I will be getting enough sleep cycles in that night!

**Developer response:** Thank you! I’m happy you like it. Best, Kai

## Frequently asked questions about Sleep Cycle Bedtime Calculator

### What does the Sleep Cycle Bedtime Calculator do?

This app helps you calculate the best times to go to bed and wake up to maximize rest. It's based on the scientific principle of sleep cycles, which are approximately 90 minutes long, and aims to align your sleep schedule with these cycles for better refreshment.

### How does the app calculate sleep and wake times?

The app uses the duration of sleep cycles (around 90 minutes) to determine optimal times. For example, if you need to wake up at a certain time and aim for 5-6 sleep cycles, it will suggest a corresponding bedtime. You can also input your desired wake-up time and the number of cycles you want to achieve.

### Can I customize how long it takes me to fall asleep?

Yes, the app allows you to customize your estimated time to fall asleep. Most people take about 15 minutes to fall asleep, and this feature lets you adjust that estimate for more accurate bedtime calculations.

### Is this app compatible with Apple Watch?

Yes, the application offers support for Apple Watch. This integration may allow for more seamless tracking or interaction with your sleep schedule directly from your wearable device.

### What is the cost of using this app?

The app is available for free and does not appear to have any in-app purchases or advertisements based on the provided information. This means you can use its core functionality without any financial commitment.

## Version history (last 5 releases)

### 1.0.10 — 2026-04-15

Set bedtime and wake-up alarms¹² right from SleepCalc — no more switching apps. Plus: your Sleep Score, new charts, and a more reliable Apple Watch sync.

New
• Bedtime and wake-up alarms¹²
• Sleep Score — see how restorative your night was, with 14 days of history included and your full history available with a purchase¹
• Sleep Duration chart³
• Sleep Interruptions chart³

Improved
• Sleep Consistency chart is smoother and easier to read
• Bedtime and wake-up times now persist between sessions
• Customize the minimum and maximum number of sleep cycles to match your sleep style
• Settings and time sync between Apple Watch and iPhone are more reliable

Fixed
• Apple Health sleep data now syncs more reliably

¹ Requires purchase
² Requires iOS 26
³ Requires Apple Watch with sleep tracking enabled in Apple Health

### 1.0.9 — 2026-04-14

SleepCalc에서 직접 취침 및 기상 알람¹²을 설정하세요 — 앱을 전환할 필요가 없습니다. 또한: Sleep Score, 새 차트, 더 안정적인 Apple Watch 동기화.

새로운 기능
• 취침 및 기상 알람¹²
• Sleep Score — 14일 무료 기록과 함께 밤의 회복도를 확인하고, 전체 기록은 구매 후 이용 가능¹
• 수면 시간 차트³
• 수면 방해 차트³

개선
• 수면 일관성 차트가 더 매끄럽고 읽기 쉬워졌습니다
• 취침 및 기상 시간이 이제 세션 간에 유지됩니다
• 수면 주기의 최소 및 최대 수를 맞춤 설정하세요
• Apple Watch와 iPhone 간의 설정 및 시간 동기화가 더 안정적입니다

수정
• Apple Health 수면 데이터 동기화 문제 수정

¹ 구매 필요
² iOS 26 필요
³ Apple Health에서 수면 추적이 활성화된 Apple Watch 필요

### 1.0.8 — 2024-08-06

- Sleep Analysis: Get insights on your sleep with sleep data from Apple Health (requires sleep tracking with Apple Watch or iPhone)
- Sleep Consistency chart: Going to bed at the same time improves your sleep and health according to studies. With this chart you can see how often you go to sleep within 30 mins of your average bed time.

### 1.0.7 — 2024-07-29

- Sleep Analysis: Get insights on your sleep with sleep data from Apple Health (requires sleep tracking with Apple Watch or iPhone)
- Sleep Consistency chart: Going to bed at the same time improves your sleep and health according to studies. With this chart you can see how often you go to sleep within 30 mins of your average bed time.

### 1.0.6 — 2024-04-29

Added button to set the bed time to now.

## Apps similar to Sleep Cycle Bedtime Calculator

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Sleep Cycle - Tracker & Sounds](https://appshunter.io/ios/app/sleep-cycle-tracker-and-sounds/id320606217) | 4.7 (28,335) | 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 |
| [Sleep Monitor: Sleep Tracker](https://appshunter.io/ios/app/sleep-monitor-sleep-tracker/id1510325113) | 4.6 (5,240) | Free | Health & Fitness |
| [Sleepzy - Sleep Cycle Tracker](https://appshunter.io/ios/app/sleepzy-sleep-cycle-tracker/id1064910141) | 4.3 (22,380) | Free | Health & Fitness |
| [Sleepwave: Alarm & Tracker](https://appshunter.io/ios/app/sleepwave-alarm-and-tracker/id1565509007) | 4.7 (6,512) | Free | Health & Fitness |

## More apps by Kai Oelfke

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All apps by Kai Oelfke: https://appshunter.io/developer/644779478

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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 2026-08-29.*