Elmer FEM is a respected open-source multiphysics finite-element solver — but inductive WPT projects in Elmer involve heavy meshing and Sif scripting. AirInduct Sim covers the same magnetostatic regime with closed-form Biot–Savart, runs in your browser, and stays free.
Coupled multiphysics — magnetics + thermal + structural + fluid co-simulation, nonlinear materials, and any FEM-specific formulation. AirInduct is the fast first-pass tool; Elmer is where the coupled-physics validation belongs.
Sketch and sweep your coil in AirInduct, then port the chosen geometry into Elmer for the final coupled-physics validation if your study requires it.
See the full comparison matrix or try the Helmholtz simulator.