NumaSimBrowser-native circuit editor and simulator.

Build, simulate, and analyze power-electronic and control circuits — right in your browser.

Get started

Browse components

Sample circuits

Schematic editor

Drag, drop, wire, and label components on an infinite canvas with grid-aligned ports and orthogonal routing.

Streaming simulation

Run circuits in-browser via WASM. Watch traces stream into the scope panel in real time and stop runs cleanly.

Multi-rate subsystems

Nest sub-circuits that run at finer time steps. Cross-rate signals flow through explicit From/GoTo and transmission-line primitives.

Observables and power flow

Name signals, scope them on the fly, and run a steady-state load-flow over the same circuit.

AI assistant

Ask the built-in chat to add components, wire them up, or explain what your circuit does.

Open file format

Circuits save as plain JSON. Schemas drive both the GUI palette and the C++ simulator.

What is NumaSim?

NumaSim is a circuit editor that runs in your browser. It combines a JointJS-based schematic canvas with a C++ simulator (compiled to WebAssembly) so you can author, simulate, and visualize results without installing anything.

This site is the user-facing documentation:

Get started — what to install (nothing!), how to open the app, and your first circuit.
Concepts — the ideas behind observables, power flow, subsystems, multi-rate monitoring, wire routing, the scope panel, and the chat / AI assistant.
Components — reference for every component in the palette: ports, parameters, observables, samples that use it.
Samples — gallery of ready-to-run example circuits. Click "Open in app" to load any sample directly in your browser.