Brown noise, ready

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Noise colour

Volume

Sleep timer

Space bar plays or pauses. The timer fades out over its last 2 minutes. Start quietly, headphones or not.

What the noise colours are

"Colour" describes how a noise spreads its energy across pitch. Which one you like is personal. Try a few for a night each and keep the one that feels easiest to ignore.

Measured from Softfall's sound engine (this player runs the same algorithms): 60 seconds of each colour, averaged with a 16,384-point FFT and smoothed to sixth-octave bands, normalised to 0 dB at 1 kHz. Fitted slopes from 100 Hz to 5 kHz: white −0.05, pink −3.1, brown −5.6 dB per octave (ideal: 0, −3, −6). Brown levels off below about 100 Hz on purpose, so it rumbles without pushing a speaker into sub-bass it can't play. The gentle roll-off above 10 kHz is a soft low-pass that keeps hiss out of the night.

Brown noise

Strong low frequencies that fall away quickly toward the highs, like a distant waterfall or a low engine. Many people find it the warmest and least fatiguing, and it is good at covering low rumbles such as traffic.

Pink noise

Energy drops gently as pitch rises, which is close to how many natural sounds balance out. It sounds like steady rain or wind through leaves, less hissy than white noise and lighter than brown.

White noise

Equal energy at every frequency, so it sounds bright, like static or a radio between stations. It masks sharp, high sounds well but can feel harsh at higher volumes.

Grey noise

Pink noise reshaped to roughly match how human hearing is more and less sensitive across pitch, so lows, mids and highs seem about equally loud. It tends to sound flat and neutral.

Green noise

Focused around the middle of the spectrum, near 500 Hz, with the lows and highs turned down. It has a soft, natural "rushing" quality, a bit like a forest or a river heard from a distance.

Questions

Is it really free?

Yes. The web player is free, has no ads, and does not track you or set cookies.

Does it loop?

No. The sound is synthesized live by your browser, with slow random drift in tone and stereo width, so there is no recording to repeat.

Which noise is best for sleep?

There is no single answer. People often start with brown or pink because they are gentler, and choose white if they need to cover sharper sounds. Keep the volume low, comfortable and well below what would be loud in a quiet room.

Will it keep playing with my screen off?

Browsers often pause audio on locked phones. For all-night playback with the screen locked, the Softfall iPhone app is designed for it.

Is this a medical product?

No. It is a sound tool for relaxing, masking background noise and focusing. It does not diagnose or treat any condition. If you have trouble sleeping or hearing, talk to a health professional.

Does it work offline or collect my data?

Once the page has loaded, the audio is generated on your device. Nothing is uploaded and nothing is stored. This page makes no external requests.