About FocusNoise

What this is, how it is built, and the reasoning behind it.

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The idea

FocusNoise started as a single page for one problem: a room that was never quite quiet enough to work in, and a set of existing tools that all wanted an account, an app install, or a subscription to turn off adverts in the middle of a sleep track.

It is a browser tab. It generates sound, counts down, and does nothing else. There is no login, no tracking of what you play, and no paid tier holding back features.

How the audio works

The six colour noises are synthesised in real time with the Web Audio API. Each one is generated into a multi-second buffer whose end is cross-faded into its beginning, so it loops without the click that gives most noise apps away, and a gentle corrective EQ takes the harshest edge off the high end without changing the character.

The ambient recordings get similar treatment: encoder padding trimmed off both ends, then two copies played half a length apart so neither one’s seam is ever exposed on its own. Binaural presets are rendered as exact stereo sine pairs, sixty seconds long and cross-faded the same way.

Why masking works

Human hearing evolved to flag change, not volume. A sudden sound in a quiet room is information; the same sound against an existing background is not. Raising the noise floor shrinks the contrast that sudden events create, and they stop arriving as interruptions.

Which noise does that best depends on what is interrupting you. Speech intelligibility lives in high frequencies, so white noise covers conversation best. Low-frequency intrusions need the opposite — brown or red noise. And because the bright end is also the tiring end, most people end up on pink or brown for anything longer than an hour.

Natural sound, and honest limits

Research on natural soundscapes generally points in the same direction: compared with urban noise, natural sound is associated with faster recovery from stress and a more outward-directed pattern of attention. The reported effects are modest and the studies are small, which is worth saying plainly.

The same applies to binaural beats. The auditory illusion is real and well documented since 1839. The claim that the perceived beat pulls brain activity to match it — the frequency-following response — has mixed evidence behind it. Nothing here treats anything, and no page on this site will tell you otherwise.

Why the timers matter more than the sound

If you take one thing from the site, take the block, not the background. A running countdown removes the recurring decision about whether to continue, and that decision is where most sessions are lost. The audio helps at the margin; the structure does the work.

Start with a 25-minute block or the full Pomodoro cycle, add a background you can leave alone, and change nothing until it ends.

Common questions

Who made FocusNoise?

It is an independent project, built and maintained by one person. Everything on the site is free and always will be.

Do you collect data about what I play?

No. Anonymous traffic analytics only, and only if you accept the cookie prompt. Your sound choices and timer settings stay in your browser.

Can I use the sounds in a video or a podcast?

The generated colour noises and binaural tones are produced by your own browser and are not ours to license — use them freely. The ambient recordings are a different matter; get in touch before using those commercially.