We've moved — New address
circuits-cloud.com
opencircuits.net
Circuits Cloud is now Open Circuits
The free browser-based digital & analog circuit simulator you've used for years has evolved. All the power of Circuits Cloud — NGSPICE simulation, schematic capture, digital logic — reimagined at a new home. No installation. No signup required.
Digital & Analog Simulation
Real-time logic simulation and NGSPICE-powered analog circuits
Visual Circuit Editor
Drag-and-drop SVG canvas with wires, rotate, undo and multi-select
Classroom Management
Assign challenges, review submissions, and grade student work
Interactive Recordings
Teachers record step-by-step tutorials students replay on canvas
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