Free 3D Circuit Simulator
Build & Test Electronics in Your Browser
CircuitForge is an advanced, free online circuit simulator. Design, wire, and simulate complex electronic circuits in a fully interactive 3D environment powered by an MNA physics engine.
Core Features
MNA Physics Solver
Real-time Modified Nodal Analysis engine processes complex circuits, calculating voltage and current dynamically.
Comprehensive Components
From simple resistors and batteries to logic gates, relays, transistors, and motors.
AI Circuit Assistant
Stuck? Ask the integrated AI assistant to analyze your circuit, explain concepts, or fix wiring errors.
Save & Share
Save your circuits to the cloud, share private links, or publish to the community gallery instantly.
How It Works
Place Components
Select from available electronic parts and drop them onto your 3D grid.
Wire Them Up
Click component pins to establish physical connections and build your schematic.
Press Run
Hit the play button to simulate electricity flow. Watch LEDs light up and motors spin.
Frequently Asked Questions
Ready to start building?
Open the SimulatorLooking for a Multisim Live alternative? CircuitForge is free, browser-based, and requires no download or signup.