RFspice – online SPICE circuit simulator

Schematic capture and ngspice simulation that runs locally in your browser – nothing to install, no account needed. Designs are saved as .rfspice.json files on your own computer.

RFspiceR1
SCHEMATIC1 generated
bias: run .opwheel = zoom · drag background = pan
SPICE netlist
Import or select a model file.
Run a simulation, then click signals on the left (or type an expression).
Drag = box zoom · wheel = zoom X · Ctrl+wheel = zoom Y · Shift/right-drag = pan · double-click = autoscale
Traces
Cursors
Statistics ·
Markers
ngspice console