A breadboard you can actually wire

Mokxi's breadboard is 63 columns wide, on the real 0.1 inch pitch a part's legs are cut to. Each column has two five-hole strips split by a 0.3 inch center channel, plus the four power rails along the top and bottom edges.

Before a run, every hole a part or a wire touches is flattened into nets with a union-find pass, so a resistor pushed into row f and a wire pushed into row f of the same column are genuinely the same node, the way they would be on a real board. Push a part in a hole one column over and nothing happens, because that is what a real breadboard would do too.

An Arduino Uno sits beside the board and reaches it with jumper wires, exactly like the real thing. An ESP32-C3-DevKitM-1 is narrow enough to straddle the center channel and push straight in.

Mokxi solves the analog corners of a circuit by nodal analysis and runs everything else on an event-driven digital path, which is how an RC lands on the true exponential while hundreds of parts still run at real time. Diodes, LEDs, transistors and MOSFETs are real device models solved by Newton-Raphson. Every device card carries its junction capacitance, so a transistor has a high-frequency corner of its own. The editor imports core textbook SPICE elements and exports the analog circuit as an ngspice deck. On the canvas the operating point, the sweep and the small-signal frequency response are here, but not noise, distortion or temperature, and an op-amp is a single-pole macromodel rather than a transistor-level one. For those, Run a SPICE deck runs a netlist on a SPICE engine checked against ngspice, with .tran, .ac, .dc, .tf, .noise, .meas and .temp.