OrCAD (All Products) is not available for Mac but there are plenty of alternatives that runs on macOS with similar functionality. The best Mac alternative is KiCad, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 25 alternatives to OrCAD (All Products) and 11 are available for Mac so hopefully you can find a suitable replacement. Other interesting Mac alternatives to OrCAD (All Products) are Fritzing (Paid, Open Source), QUCS (Free, Open Source), LibrePCB (Free, Open Source) and Autodesk EAGLE (Free Personal).
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.
The gEDA project has produced and continues working on a full GPL'd suite and toolkit of Electronic Design Automation tools. These tools are used for electrical circuit design, schematic capture, simulation, prototyping, and production.
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.
With Solve Elec you can : - draw and analyze electrical circuits functioning in direct or alternating current - get literal formulas and values for current intensities and voltages defined in the circuit. - verify circuit related equations. - draw graphs.