SleepCycle: Sleep Calculator
Science-Based Sleep Optimizer
About
Optimize your sleep and wake up feeling refreshed with this science-based sleep optimizer. It calculates ideal bedtimes and wake-up windows based on your sleep cycles, featuring a smart alarm and detailed sleep tracking.
What's New in SleepCycle
1.0.8
May 19, 2026
In-App Purchases
$19.99
Lifetime Access
Unlock all features. One payment, lifetime access.
Developer apps
FAQ
What is the SleepCycle smart alarm?
The smart alarm in SleepCycle is designed to wake you up during your lightest sleep stage within a 30-minute window before your set alarm time. This helps you feel more alert and less groggy upon waking.
How does SleepCycle calculate optimal sleep times?
SleepCycle is built around the 90-minute sleep cycle model. It calculates ideal bedtimes and wake-up windows by working backwards or forwards in these cycles, aiming to align with your lightest sleep phase.
What are the premium features of SleepCycle?
SleepCycle Pro offers premium features such as personalized sleep insights, full history tracking, and access to all future updates. A 14-day free trial is available, followed by a one-time purchase for lifetime access.
Does SleepCycle have ads?
No, SleepCycle does not contain advertisements. The app is free to download and use, with optional in-app purchases for premium features.
What devices does SleepCycle support?
Currently, SleepCycle is supported on iPhone devices. The app is designed to leverage the specific functionalities available on iOS.
How often is SleepCycle updated?
The latest version of SleepCycle is 1.0.8, which was last updated on May 19, 2026. Updates typically include bug fixes, performance improvements, and new features.
What is the age rating for SleepCycle?
SleepCycle has an age rating of 12+. This indicates that the content is generally suitable for users aged 12 and older.
Can SleepCycle diagnose sleep disorders?
No, SleepCycle includes a medical disclaimer stating it is not intended to diagnose or treat sleep disorders. For serious sleep concerns, users should consult a healthcare professional.