KiCad vs LTspice

KiCad is a free, open-source electronic design automation suite for schematic capture and PCB layout. Its electrical rules checker flags schematic connection issues such as output-pin conflicts, missing drivers, and unconnected pins. For board routing, the PCB editor offers collision-highlight, shove, and walkaround modes that respect design rules. An integrated 3D viewer displays board designs with a library of 3D models and supports ray tracing. Schematic netlists can be exported as Pspice, Cadstar, PcbNew, or generic XML. KiCad can import schematic work from Altium tools, CADSTAR, EAGLE, EasyEDA, and LTSpice, as well as PCB designs from a wider range that includes Allegro, Fabmaster, P-CAD 200x ASCII, and SolidWorks. The project aims to serve professional designers while staying approachable to new users. Downloads are listed for Windows, macOS, and Linux, plus Docker; the stable Linux release is an x86-64 AppImage. Most source code uses GNU GPL version 3 or greater, and libraries use CC-BY-SA 4.0. KiCad was first released in 1992 and is managed by the KiCad Development Team.

LTspice is a SPICE simulator, schematic capture tool and waveform viewer for analog circuit simulation. Its graphical schematic interface lets users probe a design, run simulations and inspect results in the built-in viewer. The download includes macromodels for most Analog Devices switching regulators and amplifiers, as well as a device library for general circuit simulation. Users can import third-party SPICE models implemented with .MODEL directives or .SUBCKT blocks. Designs from Signal Chain Designer, Analog Filter Wizard, Analog Photodiode Wizard, Precision ADC Driver Tool and LTpowerCAD can be exported to LTspice for simulation or verification. Tutorials address schematic creation, transient and AC simulation, waveform viewing, transformers, third-party models and noise analysis. The EngineerZone forum is available for questions and discussion. Analog Devices presents LTspice as an engineering design tool, with demo circuits and model libraries for designers. It is listed for Linux, macOS and Windows; the free plan specifies Windows and macOS downloads. A verified forum answer from an Analog Devices employee says telemetry is sent only if users opt in, and that the setting can be changed.