calc.engineer / RF & Electronics / SPICE Simulator

SPICE Simulator v1.0.0 IN-BROWSER

A real SPICE engine running at the edge — no install, no download. Operating point (.op), DC sweep (.dc), AC (.ac) and transient (.tran) with modified nodal analysis + Newton-Raphson. R L C V I, diodes, BJTs (Ebers-Moll), MOSFETs (Shichman-Hodges), controlled sources, a parts library (reference 2N3904, 1N4148, TL072 by name), .param/.subckt, .measure/.four, and optional operating-point existence certificates.

SPICE Netlist

Analysis

Existence certificate

Result

Run a simulation to see the waveform, node voltages, and any .measure results.

What it does

.op / .dcOperating point & DC sweeps with robust gmin-stepping convergence.

.acComplex small-signal frequency response around the operating point.

.tranTransient with a truncation-error red flag when under-resolved.

certifyNewton–Kantorovich existence proof for the operating point.

From an agent (MCP) or the API

curl -X POST https://calc.engineer/api/spice_simulate \
  -H "Content-Type: application/json" \
  -d '{"netlist":"...","analysis":"tran"}'

MCP: connect to https://calc.engineer/mcp and call spice_simulate. Then lay the circuit out with pcb_layout.

calc.engineer — free, MCP-native engineering tools. Up to 150 components, in-worker.