Last updated: March 2026
Why White Noise Helps You Sleep and Focus
White noise works by masking sudden changes in sound — a door closing, a dog barking, traffic — that would otherwise wake you or break your concentration. Studies show that consistent ambient noise can reduce the time it takes to fall asleep by 38% and improve focus during cognitive tasks. Brown noise, with its deeper rumble, has become especially popular for deep sleep and ADHD focus.
Frequently Asked Questions
What's the difference between white, pink, and brown noise?
White noise has equal energy at all frequencies (like TV static). Pink noise rolls off at higher frequencies, sounding more natural (like a waterfall). Brown noise has even more bass and less treble (deep rumbling) — it's the most popular choice for sleep.
Do I need to download anything?
No. All sounds are generated in real-time by your browser using the Web Audio API. There are no audio files to download or stream. The tool works instantly, even offline after the page loads.
Does the sleep timer stop abruptly?
No — the sleep timer gradually fades all sounds over the last 30 seconds to avoid waking you up. The audio smoothly decreases to silence.
Does this use a lot of battery?
Minimal battery since sounds are generated locally (no streaming). Zero data usage after the page loads — everything runs in your browser's audio engine.
Can I share my sound mix?
Yes. Click 'Save Mix' to copy a URL with your sound selection and volume levels encoded. Anyone who opens the link hears your exact mix.