Sleep Only

Health & Fitness

Free · In‑App Purchases · Designed for iPad. Not verified for macOS.

Curated non-looping sounds with adaptive sound capability proven to improve sleep quality from the makers of the popular LectroFan and Sound+Sleep machines. Transform your bedroom into a sanctuary with Sleep Only. Designed by the experts at Adaptive Sound Technologies Inc. (ASTI), the makers of top sound machine brands LectroFan™ and Sound+Sleep. This app composes high-quality, non-looping audio in real-time to help you fall asleep faster, stay asleep longer and improve your overall sleep quality. Sleep Only earned the SleepMark™ designation because it aligns with National Sleep Foundation recommendations, based on its attested product design, evaluation, and documentation. Sleep Only is a calming sound app proven to help you sleep, relax and unwind better by an independent study done by SleepScore Labs. Choose from a carefully curated library of sleep promoting sounds, including noises (such as white, pink, brown, green, and numerous selections in between), fan sounds, nature and water sound compositions, lullabies, 40 Hz therapy beats, and more. Our library is built from ASTI’s acclaimed LectroFan™ and Sound+Sleep collections plus some additional sounds designed specifically for Sleep Only. Sleep Only was designed with your sleep as a priority, no nonsense. Unlike other apps, we believe your sleep environment should be private and distraction free. Sleep Only is 100% ad-free, notification-free, and surveillance-free. We do not track, record, or sell your data. Sleep easy knowing this app respects your privacy. Expertly Designed Sounds • A wide variety of carefully mastered sound compositions for ultimate relaxation and sleep • Sound generator from ASTI’s LectroFan and Sound+Sleep sound machines, proven to improve your sleep quality • Non-looping hi-fidelity audio: non-looping in all categories, except for lullabies and 40 Hz therapy beats Options on Your Preference • 11 Language Options to choose from: English, French, Spanish, Portuguese, Dutch, German, Italian, Polish, Korean, Japanese, and Chinese • Bluetooth Capable: Use the BT speaker of your choice, or play the sounds on your phone Elegant User Interface • Distraction free sleep sound catalog • Simple to learn and use • Customizable Favorites List for easy access to your favorite sounds What makes us different from other sound apps? • Non-looping, High Quality Sleep Sound Compositions, generated in real-time on your phone or tablet. Most sound apps loop. All of our sounds, all categories, except for lullabies and the 40 Hz therapy beat sounds, are non-looping, meaning the sound composition will play continuously without repeating. • Patented Adaptive Sound Technology (Premium Subscription only): We are the only sleep sound app available with the ability to automatically adjust volume and sound content dynamically based on the ambient noise in your room. • No Internet Connection required (After initial download). • We Respect Your Privacy: We do not track, sell, or record your data Subscriptions Standard Subscription • Over 35 non-looping, high-fidelity sounds across two categories: Noises and Fans • Shut-off timer function for easy sleep scheduling Premium Subscription • Unlocks over 120 high-fidelity sounds across six categories: Noises, Fans, Nature, Water, Lullabies, and Other • Shut-off timer function • Patented Adaptive Sound Technology automatically adjusts the sleep sound output to suit your room’s environment. Second generation adaptive sound technology from ASTI allows you to control minimum and maximum volume levels, ramp up and ramp down rates, and microphone sensitivity, to adapt to your specific ambient noise situation. 14 Day Risk-Free Trial, does not automatically subscribe at the end of the trial* *If subscribed after trial, the subscription will auto renew monthly unless cancelled. Cancellation is made easy through the app’s account page. Terms of Service: https://www.soundofsleep.com/app-terms Privacy Policy: https://www.soundofsleep.com/app-policy

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The developer, Adaptive Sound Technologies Inc., 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 Linked to You

    The following data may be collected and linked to your identity:

    • Contact Info
    • Identifiers
    • Diagnostics

  • Data Not Linked to You

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

    • Diagnostics

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
  • Adaptive Sound Technologies Inc.
Size
  • 92.2 MB
Category
  • Health & Fitness
Compatibility
Requires iOS 17.0 or later.
  • iPhone
    Requires iOS 17.0 or later.
  • iPad
    Requires iPadOS 17.0 or later.
  • Mac
    Requires macOS 14.0 or later and a Mac with Apple M1 chip or later.
Languages
  • English
Age Rating
4+
In-App Purchases
Yes
  • Premium Subscription Monthly $4.99
  • Standard Monthly Subscription $2.99
  • Learn More
Copyright
  • © 2026 Adaptive Sound Technologies, Inc.
  • Developer Website
  • Privacy Policy

    • More by Adaptive Sound Technologies Inc.