Sleep Calculator - SleepCal

Cycle Alarm & Nap Timer

Only for iPhone

Free · In‑App Purchases · Designed for iPhone

iPhone

Wake up refreshed, not exhausted. Based on the 90-minute sleep cycle science—calculate your perfect bedtime in seconds. Try it free tonight! 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

Ratings & Reviews

  • This app hasn’t received enough ratings or reviews to display an overview.

• Improved app stability and performance • Minor bug fixes

Version 1.0.4

The developer, 华清 沈, 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 Linked to You

    The following data may be collected but it is not linked to your identity:

    • Identifiers
    • Usage Data

Privacy practices may vary, for example, based on the features you use or your age. Learn More

Accessibility

The developer has not yet indicated which accessibility features this app supports. Learn More

Information

  • Seller
    • 华清 沈
  • Size
    • 20.5 MB
  • Category
    • Health & Fitness
  • Compatibility
    Requires iOS 16.6 or later.
    • iPhone
      Requires iOS 16.6 or later.
    • Mac
      Requires macOS 13.5 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 1.0 or later.
  • Languages
    • English
  • Age Rating
    9+
  • In-App Purchases
    Yes
    • SleepCal Premium - Monthly $4.99
    • SleepCal Premium - Yearly $19.99
    • Learn More
  • Copyright
    • © 2026 Shen Huaqing
  • Privacy Policy

    • More by 华清 沈