PartSim

PartSim is a free, browser-based SPICE circuit simulator focusing on simplicity. Users drag in resistors, capacitors, op-amps, and other components onto a schematic canvas, then run transient or DC analyses. Real-time waveforms are displayed for quick circuit validation. Although not a full PCB layout solution, it helps confirm circuit functionality. With an integrated Bill of Materials and no installation required, PartSim suits quick prototyping or educational labs. The free model library covers many standard parts, making it a handy tool for fast, shareable circuit simulations online.