a transient simulator that runs in the browser. pick an example or build your own: parts snap to the grid, wires join at their ends, the dots show current, and the scope plots whatever you ask it to. everything is computed live, so change a value and watch what happens.
a 1 kHz square wave through a filter with its corner at 1 kHz: edges get rounded off.
no selection
click a part to edit its value. drag to move: attached wires follow. drag a wire's end to reroute it, or its middle to shift it. click a switch to flip it.
keys: r rotate, del remove, ctrl+c/x/v copy, cut, paste (at the mouse), ctrl+d duplicate, esc back to select, ctrl+z undo.
shift-drag or right-drag pans the canvas.