Open Circuits is a free, browser-based circuit simulator designed from the ground up for students, teachers, and hobbyists who want to learn electronics without installing software or buying expensive hardware.
We believe every student deserves access to high-quality circuit simulation tools regardless of their school's budget or the computer they own. Open Circuits removes the barriers to learning electronics by putting a full-featured digital and analog circuit editor directly in the browser.
Whether you are studying Boolean algebra and logic gates for the first time, exploring Kirchhoff's voltage and current laws, or designing complex analog amplifier circuits, Open Circuits gives you the tools to build, simulate, and understand real circuits in real time.
From middle school to university, students use Open Circuits to complete homework, explore circuit concepts interactively, and prepare for exams in digital electronics, electrical engineering, and physics courses. The real-time simulation lets you instantly see how changing a resistor value affects voltage and current.
Educators create interactive recorded lessons that students replay step by step. Set up classroom groups, assign circuit-building challenges with deadlines, and review student submissions directly in the platform. No more collecting screenshots or fighting with desktop software licenses.
Quick prototyping before soldering. Test LED circuits, voltage dividers, transistor switches, and timer circuits without breadboarding. Open Circuits supports both digital logic (AND, OR, NOT, XOR, flip-flops, multiplexers) and analog components (resistors, capacitors, inductors, diodes, transistors, op-amps).
Open Circuits is a web application built with Vue.js and rendered on an HTML5 Canvas with a custom circuit engine. The analog simulator uses modified nodal analysis (MNA) to solve circuits in real time, similar to how professional SPICE simulators work — but optimized for instant feedback in the browser.
All circuit data is saved securely in the cloud. You can access your circuits from any device, share them with classmates, or fork designs from the public circuit library to learn from existing examples.
Join thousands of students and teachers already using Open Circuits.