Metro Line Builder

A drawing toy for transit nerds. Sketch your own metro lines over a blank grid — stations snap into place, interchanges connect, and the map renders itself in the classic diagram style.

Every city I've lived in, I've ended up staring at the metro map. Metro Line Builder is what happens when that habit turns into a side project: a small canvas toy where you draw lines, drop stations, and watch the diagram redraw itself with the 45-degree geometry that makes transit maps feel official.

It's an experiment in constraint-driven drawing — the tool fights you a little, snapping everything to the grid, and that fight is what makes the result look designed rather than doodled.

The toy comes with its own small design system — Metro DS — covering the diagram grammar: line colours, station ticks, interchange marks, and the type that labels them.