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Instead of ngspice

ngspice alternatives

ngspice is a free, open-source simulator for analog, digital, and mixed-signal circuits. It works on Linux, macOS, Windows, and self-hosted deployments, using netlists and command-line or file-based input. Its device models cover active, passive, analog, and digital elements, while PSPICE and LTSPICE parameters support discrete-circuit compatibility. Verilator, GHDL, Verilog-A, shared-library, KiCad, Autodesk Fusion, and Python integrations extend simulation workflows. Mailing lists, forums, documentation, an FAQ, and a bug tracker support users.

  1. 1

    OpenFOAM

    by OpenFOAM
    Free plan LinuxMacSelf-hosted+1

    3D visualization and data export — OpenFOAM offers 3D visuals and data export, but does not provide ngspice's electrical-circuit simulation features.

    7.7 Free plan Visit site
  2. 2

    OpenSim

    Free plan APILinuxMac+1

    Biomechanical and movement simulation — OpenSim models humans, animals, robots, and movement with a graphical interface instead of ngspice's electrical circuits.

    7.7 Free plan Visit site
  3. 3

    Xcos

    by Xcos
    Free plan LinuxMacWindows

    Graphical hybrid-system modeling — Xcos provides graphical authoring for hybrid dynamical systems in discrete and continuous time, unlike ngspice's file-based circuit input.

    7.5 Free plan Visit site
  4. 4

    SimFlow

    by SimFlow
    Free plan LinuxMacWeb+1

    Freemium 3D simulation with trial access — SimFlow adds graphical authoring, 3D visuals, offline access, data export, and web availability, with paid plans unlike ngspice.

    7.6 Free plan · paid from €8,000/user/yr · 30-day trial Visit site
  5. 5

    GNU FisicaLab

    Free plan LinuxWindows

    Educational physics problem solving — GNU FisicaLab focuses on guided physics problems, free-body diagrams, and SI or English units rather than circuit simulation.

    7.3 Free plan Visit site
  6. 6

    FeenoX

    Free plan APILinuxSelf-hosted+1

    Open-source plain-text engineering models — FeenoX uses self-descriptive English-like plain-text files and offers 3D visuals and exports, without ngspice's SPICE focus.

    7.6 Free plan Visit site
  7. 7

    Step

    Free plan Linux

    Interactive classical-mechanics experiments — Step interactively simulates mechanics, molecular dynamics, sound waves, and deformable bodies, not analog or mixed-signal circuits.

    7.2 Free plan Visit site
  8. 8

    ASCEND

    by ASCEND
    Free plan LinuxMacWindows
    7.4 Free plan Visit site
  9. 9

    MPTRAC

    by MPTRAC
    Free plan LinuxSelf-hostedWeb
    7.4 Free plan Visit site
  10. 10

    myPhysicsLab

    by myPhysicsLab
    Free plan LinuxMacSelf-hosted+2
    7.4 Free plan Visit site
  11. 11

    Open Source Physics

    by Open Source Physics
    Free plan AndroidiPhoneLinux+3
    7.3 Open source Visit site
  12. 12

    PySDM

    Free plan LinuxSelf-hosted
    7.3 Free plan Visit site
  13. 13

    DynamicalSystems.jl

    by DynamicalSystems.jl
    Free plan LinuxMacWindows
    7.3 Free plan Visit site
  14. 14

    libCEED

    Free plan APILinuxSelf-hosted
    7.3 Free plan Visit site
  15. 15

    LISE++

    Free plan LinuxMacWindows
    7.3 Free plan Visit site
  16. 16

    Algodoo

    by Algodoo
    Free plan iPhoneMacWindows
    7.3 Free plan Visit site
  17. 17

    VaMPy

    Free plan LinuxMacSelf-hosted+1
    7.3 Free plan Visit site
  18. 18

    SimScale

    by SimScale
    Free plan Web
    7.2 Free plan Visit site
  19. 19

    FEST-3D

    by FEST-3D
    Free plan LinuxMac
    7.2 Open source Visit site
  20. 20

    FDTDX

    Free plan LinuxSelf-hosted
    7.2 Free plan Visit site
  21. 21

    PySWMM

    Free plan LinuxMacWindows
    7.2 Free plan Visit site
  22. 22

    Physics Classroom Physics Interactives

    Free plan AndroidiPhoneWeb
    7.1 Free plan Visit site
  23. 23

    pyuvsim

    Free plan LinuxMacWindows
    7.1 Free plan Visit site
  24. 24

    PyAutoLens

    Free plan LinuxMacWindows
    7.1 Free plan Visit site

Alternatives appeal mainly because ngspice has no schematic entry, so circuit construction stays text-based. Its free plan is priced at 0.00 USD, and stable downloads provide Windows binaries and source archives; Linux users may need a distributor package or source compilation, while its own macOS release is unavailable there. Other tools may suit readers seeking graphical authoring, 3D visuals, offline work, lesson content, plain-text modeling, or simulations outside electrical circuits. Compare each option's domain, interface, platforms, visualization, export, and pricing before giving up ngspice's SPICE compatibility and mixed-signal scope.

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