Open Source LTspice AlternativesCircuit Simulators & Electronic Design Automation Tools like LTspice

The best open source alternative to LTspice is KiCad. If that doesn't suit you, our users have ranked more than 25 alternatives to LTspice and 11 is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to LTspice are QUCS, Circuit JS, Ngspice and Qucs-S.

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LTspice alternatives are mainly Circuit Simulators, but if you're looking for Electronic Design Automation Tools or IDEs you can filter on that. Other popular filters include Linux, Android, iPad, Free, iPad + Circuit Simulation, Open Source and iPhone. You can also filter by region, for example EU-based alternatives if you prefer software developed in the European Union. These are just examples - use the filter bar below to find more specific alternatives to LTspice.
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Alternatives list

  1. KiCad icon

    KiCad

     118 likes
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    KiCad is an open source software suite for electronic design automation (EDA) - designing schematics of electronic circuits and printed circuit boards (PCB). KiCad is developed by Jean-Pierre Charras. And features an integrated environment between schematic capture, bill of...

    59 KiCad alternatives

    Cost / License

    • Free
    • Open Source

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
    • Flathub
    • PortableApps.com
    • Docker
    PcbNew - Editor
     

    • KiCad is the most popular Windows, Mac & Linux alternative to LTspice.

    • KiCad is the most popular Open Source & free alternative to LTspice.

    • KiCad is Free and Open SourceLTspice is Free and Proprietary
    • KiCad is LightweightLTspice is not according to our users
  2. QUCS icon

    QUCS

     38 likes
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    The Quite Universal Circuit Simulator (QUCS) is an integrated circuit simulator allowing the simulation and graphical presentation of results of large-signal, small-signal and noise behavior in circuits.

    36 QUCS alternatives

    Cost / License

    • Free
    • Open Source

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
    QUCS screenshot 1
     
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    16
    Comments about QUCS as an Alternative to LTspice
    Guest
    Positive
    3

    it is much easier to operate compared to Lt Spice

    Review by a new / low-activity user.
    LTspice Icon
    QUCS icon

    • Most users think QUCS is a great LTspice alternative.

    • QUCS is Free and Open SourceLTspice is Free and Proprietary
  4. Circuit JS icon

    Circuit JS

     63 likes
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    This is a javascript electronic circuit simulator. When the applet starts up you will see an animated schematic of a simple LRC circuit. The green color indicates positive voltage. The gray color indicates ground. A red color indicates negative voltage.

    47 Circuit JS alternatives

    Cost / License

    • Free
    • Open Source

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
    • Online
    Circuit JS screenshot 1
     
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    12
    Comments about Circuit JS as an Alternative to LTspice
    Top Positive Comment
    guoiewbvc923
    0

    The best free tool to simulate circuits in the browser. There are almost no other tools to do simulations in a browser and it even allows to save and load circuits as files.

    Top Negative Comment
    Guest
    1

    It isn't a SPICE software!

    Review by a new / low-activity user.
    Guest
    Negative
    1

    CircuitJS does not run Spice (the core circuit simulator used by LTSpice, PSpice, and others). CircuitJS does not have built-in models for manufactured components nor does it allow you to define your own subcircuits. It was never built for commercial circuit design (while LTSpice was).

    Review by a new / low-activity user.
    Show more comments
    3 of 5 comments
    LTspice Icon
    Circuit JS icon

    • Some users think Circuit JS is a great LTspice alternative, some don't.

    • Circuit JS is the most popular Web-based alternative to LTspice.

    • Circuit JS is Free and Open SourceLTspice is Free and Proprietary
  5. Ngspice icon

    Ngspice

     8 likes
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    Ngspice is a mixed-level/mixed-signal circuit simulator. Its code is based on three open source software packages: Spice3f5, Cider1b1 and Xspice. Ngspice is part of gEDA project, a full GPL'd suite of Electronic Design Automation tools.

    38 Ngspice alternatives

    Cost / License

    • Free
    • Open Source

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
    ngspice on KDE (Linux) with gschem in background
     
  6. Qucs-S icon

    Qucs-S

     2 likes
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    Qucs-S is a spin-off of the Qucs cross-platform circuit simulator. "S" letter indicates SPICE. The purpose of the Qucs-S subproject is to use free SPICE circuit simulation kernels with the Qucs GUI.

    31 Qucs-S alternatives

    Cost / License

    • Free
    • Open Source

    Application types

    Platforms

    • Linux
    • Flathub
    • Flatpak
    Qucs-S screenshot 1
     
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    2
    Comments about Qucs-S as an Alternative to LTspice
    Guest
    Positive
    0

    Has a nice graphical interface and can integrate a simulation application like ngspice

    Review by a new / low-activity user.
    Guest
    Positive
    0

    Harmonic Balance simulation and Xyce!

    Review by a new / low-activity user.
    LTspice Icon
    Qucs-S icon
    • Qucs-S is Free and Open SourceLTspice is Free and Proprietary
  7. OpenModelica icon

    OpenModelica

     18 likes
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    OpenModelica – A Free Modelica Environment! OpenModelica is an open-source Modelica-based modeling and simulation environment intended for industrial and academic usage. Its long-term development is supported by a non-profit organization – the Open Source Modelica Consortium (OS.

    48 OpenModelica alternatives

    Cost / License

    • Free
    • Open Source

    Application type

    Platforms

    • Mac
    • Windows
    • Linux
    OpenModelica screenshot 1
     
  9. Ktechlab icon

    Ktechlab

     28 likes
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    KTechLab is an IDE for microcontrollers and electronics. It supports circuit simulation, program development for microcontrollers and simulating the programmed microcontroller together with its application circuit.

    28 Ktechlab alternatives

    Cost / License

    • Free
    • Open Source

    Application types

    Platforms

    • Linux
    Ktechlab screenshot 1
     
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    1
    Comments about Ktechlab as an Alternative to LTspice
    Guest
    Positive
    0

    good documentation written in simple terms and easy to use

    Review by a new / low-activity user.
    LTspice Icon
    Ktechlab icon
    • Ktechlab is Free and Open SourceLTspice is Free and Proprietary
    • Ktechlab is Privacy focused and LightweightLTspice is not according to our users
  10. Coulomb icon

    Coulomb

     2 likes
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    Coulomb is a simple and elegant circuit simulator written using Java, Gtk4 and libadwaita.

    Cost / License

    • Free
    • Open Source

    Application type

    Platforms

    • Linux
    • Flathub
    • Flatpak
    Coulomb screenshot 1
     
  11. Xcos icon

    Xcos

     17 likes
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    Xcos is a graphical editor to design hybrid dynamical systems models. Models can be designed, loaded, saved, compiled and simulated.

    97 Xcos alternatives

    Cost / License

    • Free
    • Open Source

    Platforms

    • Mac
    • Windows
    • Linux
    Xcos screenshot 1
     
  12. Oregano icon

    Oregano

     5 likes
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    oregano - An electrical engineering tool for GNOME

    oregano is an application for schematic capture and simulation of electronic circuits. The actual simulation is performed by Berkeley Spice, or GNUcap or the new generation ngspice which is required for simulation, but not neces.

    Cost / License

    • Free
    • Open Source

    Application types

    Alerts

    • Discontinued

    Platforms

    • Linux
    Oregano screenshot 1
     
  13. Emulino icon

    Emulino

     Like
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    Emulino is an emulator for the Arduino platform by Greg Hewgill, originally found on emulino: arduino cpu emulator.

    Cost / License

    • Free
    • Open Source

    Platforms

    • Linux
     
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