# Sleep Cycle Bedtime Calculator — user reviews > 77 indexed App Store user reviews of Sleep Cycle Bedtime Calculator by Kai Oelfke, rated 4.10/5 from 280 ratings. - Source: https://appshunter.io/ios/app/sleep-cycle-bedtime-calculator/id1668639153/reviews - App overview in markdown: https://appshunter.io/ios/app/sleep-cycle-bedtime-calculator/id1668639153.md - Rating breakdown: 5★ 180 · 4★ 35 · 3★ 15 · 2★ 14 · 1★ 36 ## 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 ## Newest reviews (13 of 77) ### 5/5 — Best sleep ever *2025-05-29, version 1.0.8* So Amazing ### 5/5 — LOVE LOVE LOVE *2025-01-18* Great functionality, no ads that compromise your ability to use it, and i love the different options for calculating times and the fact that it lists all possible times. A beautifully made app, 10/10. **Developer response:** Thank you! Best, Kai ### 5/5 — Super App *2025-01-11* 👍 **Developer response:** Danke dir! Grüße, Kai ### 5/5 — Muito legal esse app, calcula muito bem a hora de vc acordar etc. *2025-01-11* 5 estrelas🔥 **Developer response:** Obrigado ### 5/5 — Perfect *2024-12-12* Does exactly what you need it to without intrusion. The perfect utility app. **Developer response:** Thank you! Best, Kai ### 4/5 — Propre *2024-12-04* Magnifique **Developer response:** Merci. Veuillez envisager de lui attribuer 5 étoiles au lieu de 4 pour soutenir mon travail ### 4/5 — JimSpeedy1dino *2024-11-28* Where I found this app helpful is, I noticed I naturally wake up near 7:40 am most days. If that’s normal for me, then I might consider being in bed by a certain time. It is something to try for be better sleep health. The app offers two choices. **Developer response:** It’s very good to keep bed and wake up time consistent for your body. Thank you for the review. Best, Kai ### 5/5 — Sleep *2024-11-28* Very good!! **Developer response:** Thank you! Best, Kai ### 5/5 — Macht was es soll 👍🏻 *2024-11-25* Macht was es soll **Developer response:** Danke dir! ### 4/5 — . *2024-11-08* Am Anfang war ich sehr skeptisch aber doch es gefällt mir sehr durch die App weiß ich wann ich wie aufstehen muss das is einfach perfekt **Developer response:** Danke! Wenn dir die App gefällt und du meine Arbeit unterstützen willst könntest du die App auch mit 5 Sternen bewerten. Grüße, Kai ### 4/5 — Thank you *2024-11-05* It’s free , ✌️ will give a try. Tks **Developer response:** Thank you! Best, Kai ### 2/5 — Fair *2024-11-04* What kind of sleep at what time? Unknown by this app **Developer response:** If you mean sleep zones then they require sleep tracking with an Apple Watch or some other device that syncs with Apple Health. Sleep Calc isn’t a sleep tracker. ### 5/5 — App maravilhoso! *2024-10-21* Me ajuda todas as noites a calcular a hora certa para não acordar no meio do ciclo **Developer response:** Obrigado ## Most critical reviews (10 lowest-rated) ### 1/5 — Why *2025-04-02, version 1.0.8* No graphs. No analysis. Just cold tedious data. Why?? Confusing because its the same icon as the watch which has graphs I WISH I COULD SEE LARGE AND IN LARGE DEPTH ON MY PHONE. are they NOT related??? Why wouldnt the the charts be here? Just dumb and misleading ### 1/5 — Hard to Use *2025-03-14, version 1.0.8* This app is not user friendly. ### 1/5 — Not easy *2024-08-24* Difficult to set and morning alarm goes off when you don’t want it to **Developer response:** You must’ve confused Sleep Calc with another app. Sleep Calc doesn’t have an alarm. So this can’t be from my app. Best, Kak ### 1/5 — Cannot understand *2024-04-04* I accidentally deleted the sleep app on my Apple Watch. I tried to replace it with this app, but I can’t seem to figure out how to set it up correctly or get the information I want from it. It has the same icon as my previous app, but it’s not user friendly. **Developer response:** You can search for Apple as they have their own developer page in the App Store. Then you can install back the Apple sleep app for your watch. Sleep Calc is a simple calculator. It doesn’t do sleep tracking. You probably confused it with another app. Please consider editing your rating. ### 1/5 — Haven’t used *2023-12-06, version 1.0.4* It requires me to write a review and I haven’t used it yet ### 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 ### 2/5 — Hard to evaluate what it shows. *2026-03-17, version 1.0.8* Confusing. ### 2/5 — None *2025-06-28, version 1.0.8* Touching the screen does nothing 😩 ### 2/5 — Not helpful *2025-05-04* Not helpful data and difficult to analyze. Fitbit was better when it came to sleep honestly. **Developer response:** It’s just a simple calculator for wake up and sleep times and not a sleep tracker. Thank you for your understanding. Best, Kai ### 2/5 — Luz *2025-04-07* Da ## Most praised reviews (10 highest-rated) ### 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 ### 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 ### 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 ### 5/5 — Doesn’t collect data! *2025-07-29* A simple sleep cycle calculator that doesn’t collect users data. It’s perfect for my needs. **Developer response:** Thank you! I’m happy you like it. Best, Kai ### 5/5 — Good *2025-06-19, version 1.0.8* Like this sleep calculator compared to other ones, wish the times wouldn’t reset when closing app though --- *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 2026-08-24.*