About Lett
A free ambient sound app built for people who value focus, calm, and privacy.
Our Mission
Lett was created with a simple belief: everyone deserves access to tools that help them focus, relax, and sleep better. We built Lett to be the ambient sound app we always wanted but could never find. One that is free, respects your privacy, and gets out of your way so you can get things done.
Too many wellness and productivity apps are locked behind subscriptions, cluttered with ads, or quietly collecting your data. Lett takes a different approach. We offer 84 high-quality ambient sounds with no paywalls, no accounts, and no tracking. Your experience is yours alone.
What Lett Offers
84+ Ambient Sounds
A curated library spanning nature, rain, urban environments, animals, white noise, binaural beats, and more. Each sound is selected for quality and usefulness.
Sound Mixing
Layer multiple sounds together and adjust individual volumes to create your perfect audio environment. Save your combinations as presets for quick access.
Productivity Tools
Built-in Pomodoro timer, to-do list, notepad, and sleep timer. Everything you need to stay productive or wind down for the night, all in one place.
Works Offline
Lett is a Progressive Web App that works without an internet connection. Install it on your phone, tablet, or desktop and use it anywhere.
Privacy First
Lett does not collect personal data. There are no user accounts, no cookies for tracking, and no third-party analytics watching what you do. Your sound preferences are stored locally on your device and never leave it.
We believe software tools should serve you, not the other way around. Read our full Privacy Policy for details.
Try Lett Today
Start mixing ambient sounds for free. No sign-up, no download, no strings attached.
Start Listening