Numo Sleep

White noise and sleep sounds for Android

Fall asleep anywhere.
Even in airplane mode.

Rain, ocean waves, brown noise, a steady fan and more, generated live on your phone. Nothing to download, nothing that loops, and no internet needed.

Get it on Google Play Free. No ads. One-time Pro.

Numo Sleep app icon

What it does

Works offline

Every sound is synthesized on your phone while it plays, so it works on flights, in hotels and anywhere without signal. The app stays tiny.

Private by design

No account, no ads, no analytics, no tracking. Your mixes and settings stay on your phone.

Pay once

The free version is genuinely useful. Pro is a single purchase, not a subscription.