What is Tone Shelf?
Tone Shelf is a free brown noise, white noise, and ambient sound generator that runs entirely in your browser. It synthesizes 10 layered sound channels — brown, pink, and white noise plus rain, storm, wind, fire, ocean waves, fan hum, and binaural beats — all in real time. No downloads, no signup, no audio files streamed from a server. Part of a collection of 170+ free browser tools at
arcade.pirillo.com.
Is Tone Shelf completely free?
Yes — 100% free with no hidden limits, no account required, no ads, no premium tier, and no feature gates. All 10 sound channels and the full mixer interface are available immediately with no signup.
What is brown noise and why is it so popular?
Brown noise emphasizes lower frequencies, producing a deep, rumbly tone — like a strong waterfall or distant thunder. It's become hugely popular for focus, studying, and sleep because many people find it more soothing than white noise. Unlike white noise (which has equal energy at all frequencies and sounds like static) or pink noise (which rolls off higher frequencies for a warmer tone), brown noise sits in the lowest, most calming range. Tone Shelf generates all three so you can compare and mix.
How do I use Tone Shelf?
Click the power switch to turn on (or just grab any knob — it auto-powers on). Each of the 10 knobs controls a different sound channel. Rotate clockwise to increase volume, counterclockwise to decrease. Layer multiple sounds together. The large MASTER knob controls overall output. The twin VU meters show your combined audio level. Click power again to shut off. For binaural beats, use headphones — the effect requires different frequencies in each ear.
Does Tone Shelf collect my data or stream audio?
No. Everything runs locally in your browser using the Web Audio API. All sounds are generated mathematically on your device — no audio files are downloaded or streamed. No data leaves your device. There are no accounts, no cookies (beyond basic anonymous page analytics), and no tracking.
What devices and browsers work?
Any modern browser with Web Audio API support — Chrome, Firefox, Safari, and Edge on both desktop and mobile. Works on phones, tablets, laptops, and desktops. For the best binaural beats experience, use headphones.
How does Tone Shelf compare to Noisli, myNoise, or SimplyNoise?
Unlike Noisli (requires account), myNoise (complex interface, optional donations), and SimplyNoise (limited sounds), Tone Shelf is completely free with no account, synthesizes all sounds locally with zero server dependency, and offers 10 mixable channels in a vintage hardware interface. No premium tier, no ads, no data collection. If you enjoy audio tools, also try
Tenori-Online (musical sequencer) and
Theremin (play by hand gestures).
Can I use Tone Shelf for sleep, focus, or studying?
Absolutely. Many people use brown noise for deep focus and studying, pink noise for relaxation, rain + thunder for sleep, and ocean waves for meditation. The mixer lets you create your own custom blend — try layering brown noise with rain at low volume for a cozy study soundscape, or ocean waves with wind for sleep.