Is there an easier free alternative to OpenEMS for WPT coil design?

Yes — AirInduct Sim is a free, browser-based alternative for the inductive WPT regime. No MATLAB / Octave host, no FDTD mesh, eight built-in coil topology presets, and a 100×100 field map in under two seconds.

When is OpenEMS still the right tool?

OpenEMS is the right pick when you need full-wave time-domain results for antennas, EMC studies or research that explicitly requires FDTD. For inductive WPT (sub-30 MHz) AirInduct gets you to a candidate coil far faster.

Do I need to install anything?

No — AirInduct runs in any browser. No MATLAB, no Octave, no Python toolbox, no compile step.

AirInduct Sim

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ALTERNATIVE — OPENEMS

NO MATLAB HOST

NO FDTD MESH

BROWSER-NATIVE

The friendlier free OpenEMS alternative for WPT.

OpenEMS is a powerful open-source FDTD electromagnetic solver — but it ships as a MATLAB / Octave toolbox with manual mesh setup. AirInduct Sim covers the inductive WPT regime with closed-form Biot–Savart, runs in your browser, and stays free.

01. · Why move from OpenEMS for WPT

No MATLAB / Octave host required.
No FDTD mesh and no time-step convergence study.
Eight WPT topology presets out of the box (Helmholtz, DTC, square, cross).
Runs on any browser.
Public REST API and MCP server for AI agents.

02. · Where OpenEMS still wins

Full-wave FDTD studies, antennas, EMC, and any research project that explicitly needs time-domain results. For inductive WPT exploration, AirInduct is the faster fit.

03. · Migration path

Sketch and sweep your coil in AirInduct, then port the chosen geometry into OpenEMS for a final FDTD validation if your study requires it.

See the full comparison matrix or try the Helmholtz simulator.

From FDTD scripts to a browser tab.

Open the simulator →Full comparison