
Qucs-S alternatives
Qucs-S is a spin-off of the Qucs cross-platform circuit simulator. The letter S indicates the SPICE engine that does all the simulation inside the software. The purpose of the Qucs-S subproject is to use free SPICE circuit simulation kernels with the Qucs GUI. It merges the power of SPICE and the simplicity of the Qucs GUI. Qucs intentionally uses its own SPICE incompatible simulation kernel Qucsator. It has advanced RF and AC domain simulation features, but most of the existing industrial SPICE models are incompatible with it. Qucs-S is not a simulator by itself, but it requires using a simulation backend with it. The schematic document format of Qucs and Qucs-S are fully compatible.
Some highlighting features of Qucs-S include backward compatibility with Quscs, direct support for SPICE models, model cards, and SPICE sections. It supports advanced SPICE components like Equation-defined sources and RCLs, transmission lines, RCL, BJT, MOSFET, JFET, and MESFET. All in all, Qucs-S is a great circuit simulator that you can consider among its alternatives.















