Blackstart Labs
GridSketch
Four palettes—single-line power, controls, network, and basic shapes—on a snap grid. Drop custom SVGs into public/gridsketch/ as {id}.svg. Hover a basic shape to style it.
Drag symbols onto the grid. Click a block to select it—connectors show only on the selected block. Start a wire from a port, select another block, then click one of its ports to finish. Edit the name in the field below. Del removes the selected block.