Slumbr

Slumbr is a powerful ambient sound engine and mixer designed to help you sleep, focus, and relax. Mix and match from a library of procedurally generated sounds to create your perfect audio environment.
Start with classic noise colors like White, Pink, and Blue noise — available completely free. Upgrade to Premium to unlock the full library of 30+ sounds including nature scenes, ambient environments, binaural beats, and tonal sounds.
SOUND CATEGORIES
Noise: White, Pink, Brown, Blue, Violet, Grey, and Velvet noise — each with a unique frequency profile for different needs.
Nature: Rain, Heavy Rain, Thunder, Wind, Ocean Waves, Babbling Stream, Campfire, Crickets, Birdsong, and Frogs.
Ambient: Box Fan, Air Conditioner, Train on Tracks, City Hum, and Airplane Cabin.
Tonal: Binaural beats for Focus, Relaxation, Meditation, and Deep Sleep. Plus Singing Bowl, Wind Chimes, Heartbeat, Cat Purr, and Om drone.
FEATURES
Mix multiple sounds together with independent volume and stereo pan controls for each channel. Save your favorite combinations and load them anytime. Choose from curated presets for common scenarios like Deep Sleep, Focus Mode, Thunderstorm, Zen Garden, and more.
Set a sleep timer with duration or schedule mode so sounds stop automatically. Fade in and fade out controls for gentle transitions. Follow along with guided breathing exercises including 4-7-8, Box Breathing, and more.
All sounds are generated in real time — no large downloads, no streaming, no internet required. Works completely offline.
Designed for background playback. Slumbr keeps playing when your screen is off so you can drift off without worrying about your phone.
FREE FEATURES

White, Pink, and Blue noise
Full mixer with volume and pan controls
Background playback

PREMIUM UPGRADE ($4.99 one-time)

All 30+ sound types
All curated presets
Save and load custom mixes
Breathing exercises
Timer and fade controls

Sleep well