Overview
A logic gate simulator is an interactive tool that lets you build and test digital logic circuits directly in your browser — no downloads, no signup, no hardware required. You drag gates onto a canvas, connect them with wires, flip input switches, and watch outputs update in real time.
This free simulator supports all seven fundamental logic gates: AND, OR, NOT, NAND, NOR, XOR, and XNOR, plus advanced components like flip-flops, multiplexers, half-adders, full-adders, and 7-segment displays. It is designed for university students studying digital electronics, hobbyists exploring computer engineering concepts, and educators who need an interactive classroom tool.
The simulator runs entirely in your browser using JavaScript and HTML5 Canvas, which means zero latency and instant feedback as you toggle inputs and observe logic states propagate through your circuit.
How It Works
Digital logic circuits are built from gates — small electronic components that perform boolean operations on binary signals. Each gate takes one or more input signals (HIGH = 1, LOW = 0) and produces a single output based on a fixed truth table.
In the simulator, you work on a visual canvas. You place components from the toolbox sidebar, connect their ports by drawing wires, and then interact with input switches to feed signals into the circuit. The simulator automatically evaluates the entire circuit after every change and updates all signal states — wires glow cyan when carrying a logic 1 and dim when carrying a logic 0.
More complex circuits like adders, encoders, decoders, multiplexers, and memory elements are built by combining multiple basic gates. The circuit library section includes dozens of prebuilt textbook circuits ready to load and explore.
Real-World Applications
Visualise how CPUs process binary data — from single gates through ALUs, registers, and memory cells.
Build and verify combinational and sequential circuits required in university coursework and lab assignments.
Test boolean logic designs before committing to hardware description languages like Verilog or VHDL.
Experiment with logic circuits safely in a virtual environment before building on a breadboard.
Practice digital logic problems for entrance exams, programming contests, or certifications.
Try It in the Interactive Simulator
Build Logic Gate circuits in real time — drag gates, connect wires, toggle inputs, and see outputs update instantly.
Frequently Asked Questions
- What is a logic gate simulator?
A logic gate simulator is a software tool that models the behaviour of digital logic gates (AND, OR, NOT, etc.) and lets you build, connect, and test circuits in a virtual environment. Signals are represented as binary 0 or 1, and the simulator computes outputs in real time.
- Is this logic gate simulator free?
Yes, logicsimulation.com is completely free. No account, download, or payment is required. Open the site and start building immediately.
- Can I simulate flip-flops and sequential logic?
Yes. The simulator supports D, SR, JK, and T flip-flops, as well as clock and pulse generators, so you can build registers, counters, and other sequential circuits.
- Does the simulator work on mobile?
Yes. The simulator is mobile-friendly and supports touch-based wire drawing and component placement.
- Can I save my circuits?
Yes. Use the Save button to download your circuit as a JSON file, and Load to restore it later.