ngspice

Open-source mixed-signal SPICE circuit simulator

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Last commit3 days ago16 Oct 2026

LicenceBSD-3-ClausePer the project

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From SourceForge, fetched 19 Oct 2026.

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ngspice is the open-source SPICE simulator used inside KiCad, Qucs-S and other tools. It handles analogue, digital and mixed-signal simulation and supports many commercial device models.

Free alternative to

OrCAD

In collections

CAD tools for Mac

Details

Status	Open source
Licence	BSD-3-Clause
Platforms	Windows, macOS, Linux
Category	PCB & electronics
Website	ngspice.sourceforge.io
Source	SourceForge

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