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, Ktechlab and OpenModelica.

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LTspice alternatives are mainly Circuit Simulators but may also be Electronic Design Automation Tools or CAD Software.  Other popular filters includes iPad + Circuit Simulation. Filter by these or use the filter bar below if you want a narrower list of alternatives or looking for a specific functionality of LTspice.
LTspice iconLTspice
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LTspice IV is a high performance Spice III simulator, schematic capture and waveform viewer with enhancements and models for easing the simulation of switching regulators.

More about LTspice
LTspice alternatives page was last updated Aug 22, 2024
  1. KiCad icon
     110 likes

    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...

    58 KiCad alternatives
    PcbNew - Editor

    License model

    • FreeOpen Source

    Platforms

    • Mac
    • Windows
    • Linux
    • Flathub

    Properties

    1.  Lightweight

    Features

    1.  Multiplatform
    2.  3D Renderer
    3.  Portable
    4.  Wast library
    5.  3d sketching
    KiCad iconLTspice Icon

    KiCad VS LTspice

    Is KiCad a good alternative to LTspice?
     
    • 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
     35 likes

    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.

    38 QUCS alternatives
    QUCS screenshot 1

    License model

    • FreeOpen Source

    Platforms

    • Mac
    • Windows
    • Linux
    QUCS iconLTspice Icon

    QUCS VS LTspice

    Is QUCS a good alternative to LTspice?
     
    Comments about QUCS as an Alternative to LTspice
     
    Guest

    it is much easier to operate compared to Lt Spice

    Positive commentNov 1, 2017
    3
    LTspice Icon
    QUCS icon
    • Most users think QUCS is a great LTspice alternative.

    • QUCS is Free and Open SourceLTspice is Free and Proprietary
  3. Circuit JS icon
     61 likes

    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.

    48 Circuit JS alternatives
    Circuit JS screenshot 1

    License model

    • FreeOpen Source

    Platforms

    • Mac
    • Windows
    • Linux
    • Online

    Circuit JS Features

    1.  Circuit Simulation
    2.  Browser-based
    3.  Portable
    Discontinued

    The latest update is from November 2022.

    Circuit JS iconLTspice Icon

    Circuit JS VS LTspice

    Is Circuit JS a good alternative to LTspice?
     
    Comments about Circuit JS as an Alternative to LTspice
     
       
    guoiewbvc923

    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 positive commentAug 22, 2024
    0
    Guest

    It isn't a SPICE software!

    Top negative commentOct 27, 2023
    1
    Guest

    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).

    Negative commentJul 29, 2022
    1
    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
  4. Ktechlab icon
     27 likes

    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.

    29 Ktechlab alternatives
    Ktechlab screenshot 1

    License model

    • FreeOpen Source

    Platforms

    • Linux

    Properties

    1.  Support for Themes
    2.  Privacy focused
    3.  Lightweight

    Features

    1.  Ad-free
    2.  Extensible by Plugins/Extensions
    3.  Works Offline
    4.  No registration required
    5.  Portable
    6.  Dark Mode
    Ktechlab iconLTspice Icon

    Ktechlab VS LTspice

    Is Ktechlab a good alternative to LTspice?
     
    Comments about Ktechlab as an Alternative to LTspice
     
    Guest

    good documentation written in simple terms and easy to use

    Positive commentOct 29, 2023
    0
    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
  5. OpenModelica icon
     18 likes

    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
    OpenModelica screenshot 1

    License model

    • FreeOpen Source

    Application type

    Platforms

    • Mac
    • Windows
    • Linux

    OpenModelica Features

    1.  Python IDE
    OpenModelica iconLTspice Icon

    OpenModelica VS LTspice

    Is OpenModelica a good alternative to LTspice?
     
  6. Xcos icon
     17 likes

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

    100 Xcos alternatives
    Xcos screenshot 1

    License model

    • FreeOpen Source

    Platforms

    • Mac
    • Windows
    • Linux
    Xcos iconLTspice Icon

    Xcos VS LTspice

    Is Xcos a good alternative to LTspice?
     
  7. Qucs-S icon
     1 like

    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.

    33 Qucs-S alternatives
    Qucs-S screenshot 1

    License model

    • FreeOpen Source

    Platforms

    • Linux
    • Flathub
    • Flatpak
    Qucs-S iconLTspice Icon

    Qucs-S VS LTspice

    Is Qucs-S a good alternative to LTspice?
     
    Comments about Qucs-S as an Alternative to LTspice
     
    Guest

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

    Positive commentFeb 18, 2024
    0
    Guest

    Harmonic Balance simulation and Xyce!

    Positive commentMay 23, 2018
    0
    LTspice Icon
    Qucs-S icon
    • Qucs-S is Free and Open SourceLTspice is Free and Proprietary
  8. Ngspice icon
     6 likes

    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.

    39 Ngspice alternatives
    ngspice on KDE (Linux) with gschem in background

    License model

    • FreeOpen Source

    Platforms

    • Mac
    • Windows
    • Linux
    Ngspice iconLTspice Icon

    Ngspice VS LTspice

    Is Ngspice a good alternative to LTspice?
     
  9. Oregano icon
     4 likes

    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.

    36 Oregano alternatives
    Oregano screenshot 1

    License model

    • FreeOpen Source

    Platforms

    • Linux
    Discontinued

    The last version is from December 2015.

    Oregano iconLTspice Icon

    Oregano VS LTspice

    Is Oregano a good alternative to LTspice?
     
  10. Emulino icon
     Like this app

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

    22 Emulino alternatives

    License model

    • FreeOpen Source

    Platforms

    • Linux

    Emulino Features

    1.  Arduino
    Emulino iconLTspice Icon

    Emulino VS LTspice

    Is Emulino a good alternative to LTspice?
     
10 of 11 LTspice alternatives