SleepCycle: Sleep Calculator
Science-Based Sleep Optimizer
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
Wake up refreshed every morning. SleepCycle Calculator uses 90-minute sleep science to find your perfect bedtime and wake time — so you never feel groggy again.
SleepCycle Calculator helps you find the ideal time to go to sleep or wake up — based on real sleep science. Built around the 90-minute sleep cycle model, the app calculates optimal bedtimes and wake-up windows so you always rise at the lightest stage of sleep, feeling alert and refreshed.
WHETHER YOU SET A WAKE TIME OR SLEEP NOW
• Wake-Up Mode: Enter your desired wake-up time and the app calculates 4–6 ideal bedtimes working backwards in 90-minute cycles, plus a 14-minute fall-asleep buffer.
• Sleep Now Mode: Tap "Sleep Now" and the app instantly calculates your best wake-up times based on the current time.
BUILT-IN SMART ALARM
• Tap any suggested time to set it as your alarm instantly.
• Choose from 6 soothing alarm sounds: Gentle Bells, Forest Birds, Ocean Waves, Digital Beep, Soft Chime, and Cosmic Hum.
• Preview sounds before selecting.
• Dismiss or snooze (9 minutes) when the alarm fires.
• Push notifications ensure your alarm fires even when the app is in the background.
SLEEP HISTORY & TRACKING
• Every dismissed alarm automatically logs a sleep session — bedtime, wake time, duration, cycle count, and quality rating.
• View your sleep history on an interactive calendar with color-coded indicators.
• Track 7-day and 30-day sleep averages, your best night, and total nights logged.
• Weekly bar chart shows sleep duration at a glance.
SLEEP SCIENCE EDUCATION
• Learn what a sleep cycle really is and why timing matters.
• Explore the 4 sleep stages (N1, N2, N3, REM) with durations and biological functions.
• Understand the 90-minute rule and the 14-minute sleep onset latency formula used by this app.
• Science-backed sleep tips on room temperature, blue light, caffeine, and more.
• 7 tappable references to peer-reviewed sources including the Sleep Foundation, NIH, and Harvard Health.
BEAUTIFUL DESIGN
• Deep indigo night-sky aesthetic inspired by Apple's bedtime design language.
• Color-coded quality labels: Optimal, Great, Good, and Light for each sleep option.
• Smooth animations, haptic feedback, and a breathing moon animation for a calming experience.
SleepCycle Calculator is perfect for anyone who wants to stop waking up groggy and start waking up energized — backed by science, not guesswork.
Note: A medical disclaimer is included in the app. This app is not intended to diagnose or treat sleep disorders. For serious sleep concerns, please consult a healthcare professional.
PREMIUM ACCESS
Try SleepCycle Pro free for 14 days. After the trial, unlock full lifetime access for a one-time purchase of $19.99 — no subscription, ever. Premium features include personalized sleep insights, full history tracking, and all future updates.
Ratings & Reviews
The developer, MARTHEN LUKAS LUMINGKEWAS, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- MARTHEN LUKAS LUMINGKEWAS
- Size
- 8.7 MB
- Category
- Lifestyle
- Compatibility
Requires iOS 18.0 or later.
- iPhone
Requires iOS 18.0 or later. - Mac
Requires macOS 15.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 2.0 or later.
- iPhone
- Languages
- English
- Age Rating
13+
- 13+
- Contains
Health or Wellness Topics
- In-App Purchases
Yes
- Lifetime Access $19.99
- Copyright
- © 2026 Marthen Lukas Lumingkewas