Something new,
every day.
A small, complete thing built each day: a tool, a toy, a simulation, an experiment. Everything runs in your browser. Nothing is uploaded, and there are no accounts.
Latest
Drawn by Circles
Every closed line is a sum of circles turning on circles. Draw one and watch a chain of them redraw it — then take circles away and see how few it really needs.
OpenEarlier
Without Lifting the Pen
Trace every line of a figure in one unbroken stroke, no line twice. Euler settled which figures can be done in 1736, and the ringed corners give the rule away.
Open
Wheels Within Wheels
Three beats in the time of four. Concentric rings divide one revolution different ways, so you can hear a polyrhythm and watch where the beats land together.
Open
Murmuration
Two thousand starlings, each watching only its seven nearest neighbours. Fly through them as a falcon and watch the panic ripple.
Open
Saramsha
Paste any text and see which sentences carry its meaning. A TextRank summarizer that runs entirely in your browser.
Open