CircuitSim Official

Introduction

CircuitSim Official is a browser-based free online circuit design and simulation tool with a full SPICE engine and a modern schematic editor — nothing to install. Built for students, educators and professionals, it offers real-time interactive simulation, DC / AC / transient analysis, a 5,000+ component library and a Custom Component Studio. The team is also adding a Multisim Live circuit importer as NI retires Multisim Live in September 2026.

Screenshots

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Features

• Full SPICE engine that runs in the browser, nothing to install
• DC, AC, and transient analysis plus noise, distortion and other advanced analyses
• Real-time interactive simulation that reflects changes as you edit
• 5,000+ component library, growing weekly, plus custom part authoring
• Modern schematic editor with auto-routing, keyboard shortcuts, undo and redo
• Built-in SPICE netlist editor with autocomplete
• Team and school licenses with FERPA- and COPPA-compliant options
• Multisim Live circuit importer being added