is a high-performance simulation software suite specifically designed for power electronics engineers. It combines two distinct simulation engines into a single unified design environment. Core Simulation Engines
A professional-grade, SPICE-based simulator. It is highly compatible with industry-standard SPICE models and is used for general analog and mixed-signal circuit design. simetrix/simplis
Rapidly finds the steady-state operating point of a switching system without needing to simulate the entire startup transient. It is highly compatible with industry-standard SPICE models
SIMPLIS can find the Periodic Operating Point (POP) of a switching converter than traditional SPICE. A 1ms transient simulation of a PFC boost converter that takes 30 minutes in LTspice runs in ~10 seconds here. This is its killer feature. A 1ms transient simulation of a PFC boost
SIMPLIS (Simulation for Piecewise Linear Systems) is built specifically for switching power supplies.
Provides a frequency response measurement directly from the full switching model, eliminating the need for complex "averaged" models.
In standard SPICE, to get a Bode plot (loop gain/phase), you need to create an averaged model. In SIMPLIS, you run a followed by AC analysis directly on the switching circuit . It injects a perturbation and measures the response at the switching frequency, giving you an actual measured loop response.