Free Ambient SoundsFor Focus, Sleep & Relaxation

Ambient sounds are background audio environments that mask distracting noises and create a consistent auditory atmosphere. These focus sounds work by reducing the cognitive load caused by sudden noise interruptions, allowing your brain to concentrate more effectively. Research shows that ambient soundscapes can improve productivity, enhance creativity, and help maintain sustained attention during work or study sessions.

Yes, Lett is completely free to use with no subscriptions, hidden fees, or sign-up requirements. You get full access to all ambient sounds, white noise generators, binaural beats, and productivity features without any cost. Our mission is to provide high-quality soundscapes for relaxation, focus, and sleep to everyone.

Lett offers a diverse library of professionally curated sounds including nature soundscapes (rain, thunder, ocean waves, forest), white noise and color noise variants (brown noise, pink noise), urban environments (cafe ambiance, city sounds), binaural beats for deep focus, and calming sounds for meditation. Each category is designed to support different activities like studying, sleeping, or unwinding.

To use Lett as a sleep sounds app, select calming ambient sounds like gentle rain, ocean waves, or white noise that mask disruptive background noise. Use the built-in sleep timer to automatically fade out the audio as you drift off. Many users find that combining soft nature sounds with brown noise creates the perfect environment for deep, restful sleep.

Absolutely! Lett allows you to layer and mix multiple ambient sounds simultaneously to create your perfect soundscape. Adjust individual volume levels for each sound to achieve the ideal balance. You can combine study sounds like coffee shop ambiance with rain, or mix forest birds with a gentle stream. Save your favorite combinations as presets for quick access.

Yes, Lett works offline once the sounds have been loaded. As a progressive web app, it caches your frequently used ambient sounds so you can enjoy your favorite soundscapes without an internet connection. This makes it perfect for airplane travel, outdoor activities, or areas with limited connectivity.

Binaural beats are an auditory phenomenon created when two slightly different frequencies are played in each ear. Your brain perceives a third tone—the binaural beat—at the difference between the two frequencies. Different frequency ranges (delta, theta, alpha, beta, gamma) are associated with various mental states. Lett offers binaural beats designed for deep focus, relaxation, meditation, and enhanced creativity.