SimX

Browser-first schematic & simulation

Draw schematics, run simulation, and inspect waveforms in your browser — fast to start, easy to share, nothing to install.

Start in 3 steps

Open the workspace

Load the browser workspace, then pick a built-in template when the editor opens.

Run a proven example

Start with the buck or feedback-loop examples to reach a first successful simulation quickly.

Inspect and tweak

View waveforms, change parameters, and rerun without leaving the same workspace.

What you can build

Start with proven schematic + simulation flows. PCB and SI/PI remain in active development.

Simple Buck Converter

Basic step-down DC-DC converter with switching waveform analysis.

Buck with PWM Control

PWM-controlled buck converter with gate drive and timing analysis.

Buck with Feedback Loop

Closed-loop buck converter with voltage feedback and regulation.

Buck PAC Analysis

Buck converter with periodic AC small-signal analysis, plotting Bode gain and phase response.

PCB Layout Preview (Beta)

Early PCB layout generated from the schematic, useful for trying the flow and checking direction.

Preview only

Features

Schematic Editor

Quick circuit building with a rich library of components and models. Easily configure analyses and parameters.

Simulator

Comprehensive analysis suite: DC, AC, Transient, Sweep, Monte Carlo, and more — all in one engine.

Optimizer

Wizard-guided setup makes optimization easy. Multiple algorithms available to automatically tune your design.

Waveform Viewer

Interactive, intuitive visualization for all analysis types. Linked with the schematic — select a net or component to highlight its waveform.

PCB Workflow (Beta)

Generate an early PCB layout from the schematic for exploration and handoff. This workflow is improving, but not yet the main promise.

SI / PI Lab (Experimental)

Early-stage board analysis direction for exploration. Useful to try, but still well behind the core schematic + simulation workflow.

Why SimX

Fast

100×+ faster than traditional SPICE — built for speed from the ground up

Focused

Built first around schematic capture, simulation, and waveform analysis — the parts you can rely on today.

Flexible

Use SimX instantly in the browser, and move to SimX Pro on Linux, Windows, or macOS when you need the desktop workflow.

Ideal For

Students

Learn circuit theory hands-on with instant simulation feedback.

Educators

Demonstrate concepts in live classroom sessions — students open the same tool in their browsers.

Makers

Quickly prototype and validate hobby projects before committing to hardware.

Engineers

Rapid design exploration and feasibility checks — get directional answers in seconds, not hours.