Digital Logic Sim for Windows

Brief overview

Digital Logic Sim is a lightweight, free simulator for exploring how simple digital circuits behave. Created by Sebastian Lague as a visual aid for a video series, it strips the experience down to essentials so beginners can experiment without being overwhelmed by features.

Workspace and controls

The simulator presents a dark, left-to-right canvas that acts as your circuit board. At the bottom of the screen you will find the tools for building and placing components.

• NOT — the inverter gate; one input produces one output.
• AND — a multi-input gate that yields a single output based on all its inputs.
• CREATE — place a new element or start a fresh circuit.

These items are the starting toolkit; connections flow visually across the black workspace so you can trace signals as they move.

How the gates operate

Each gate provides only one output terminal, while inputs vary by type:

• AND gates accept multiple inputs and combine them into a single result that depends on the state of all incoming signals.
• The NOT gate flips a single input to produce the opposite output.

As you build, remember to think in terms of inputs, outputs, and truth tables — the program assumes some familiarity with basic logic concepts and won’t explain gate truth tables for you.

Planned extensions

The developer plans to add more components over time to let you construct more sophisticated devices. Examples slated for later releases include:

• ADDER
• XOR
• OR

With these additions you’ll be able to assemble larger arithmetic and decision-making circuits.

Who this is for

This tool is aimed at learners, educators, and hobbyists who want a straightforward environment to visualize how computers perform logical operations. Its pared-down design makes it accessible even to those with limited technical background.

Learning resources

There isn’t an in-app tutorial, but the creator produced a video series demonstrating the simulator and explaining the concepts it illustrates. If you’re new to gates and truth tables, watch those videos or consult introductory materials on digital logic before diving in.