That one website that simulates electronic circuits: Falstad Circuit Simulator

The pickLink checked Oct 9

Falstad Circuit Simulator

Draw a circuit and watch current flow, with built-in examples

FreeNo signup

Why it's the pick

Falstad's circuit simulator animates current flowing through your schematic, with live voltages, oscilloscope traces and a big menu of example circuits from simple LRC loops to logic gates. It's free with no account or ads; the interface looks dated and you change parts through right-click menus.

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2 good alternatives

Wokwi wokwi.com Simulates Arduino, ESP32 and Pi Pico projects with real code Free tierSignup optional Link checked Oct 9

Tinkercad Circuits tinkercad.com Beginner breadboard and Arduino simulator from Autodesk FreeSignup required Link checked Oct 9

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