I wanted a clean focus timer, scratchpad, and ambient sound generator that works 100% offline without accounts, cloud sync, or bloated desktop apps.

So under my indie label Appthecary , I built Kanso : a minimalist workspace that lives entirely inside a single 7KB .html file you can drop on your desktop or USB drive.

Synthesizing Brown Noise with Math (Zero MP3s)

Instead of bundling heavy audio loops, Kanso uses the browser's native AudioContext to generate a 3-second looping buffer of procedural brown noise by integrating white noise samples in real time, routed through a BiquadFilterNode (low-pass filter from 120Hz to 1500Hz):

let lastOut = 0.0 ; for ( let i = 0 ; i < bufferSize ; i ++ ) { const white = Math .…