PathSim: An Open-Source Python Framework for Dynamical System Simulation

tom_doerr · x · 2026-08-14

PathSim is an open-source, Python-native simulation framework designed as an alternative to Simulink for modeling complex dynamical systems.

Using an intuitive block diagram approach, it allows users to build continuous, discrete, or hybrid systems by connecting sources, integrators, and scopes. Key features include minimal dependencies (numpy, scipy, matplotlib), hot-swappable blocks during simulation, stiff solvers using implicit methods, zero-crossing detection, and hierarchical subsystem nesting.

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