Ngspice
Ngspice Project
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Download from the vendor
ngspice.sourceforge.io
An open-source SPICE circuit simulator that is the solver behind a large share of the free design tools, including the KiCad simulation module. It handles DC, AC, transient, noise and sensitivity analysis, and supports semiconductor device models including industrial ones. Using it directly means the command line, but through KiCad you get it with an interface.
Ratings & Reviews
| Licence type | Completely Free, Open Source |
|---|---|
| Licence terms | Open-source licence. Free for any purpose including commercial work, with no time limit, no registration and no licence key. |
| Platforms | Linux, macOS, Windows |
| Engineering field | Electrical & Electronics |
| Tool type | Simulation & FEA, Electronics Design (EDA) |
| Vendor site | ngspice.sourceforge.io |
This link goes to the vendor site. EngiFree hosts no installers and distributes no cracked versions.
Last verified: 2026-09-02
