About Breadbit

What is Breadbit?

Breadbit is an interactive electronics laboratory that runs in your web browser. You place parts on a realistic virtual breadboard, connect them with wires, press Run, and see voltages, currents and logic levels update — without buying components or risking a burnt finger.

What you can build and test

Analog circuits: resistors, LEDs, diodes, capacitors, switches, NPN transistors, batteries and a voltmeter, solved as a complete circuit.
Digital logic: the 7400 (NAND), 7402 (NOR), 7404 (NOT), 7408 (AND), 7432 (OR) and 7486 (XOR) chips, with manual inputs and a logic probe.
Op-amps: an LM741 with practicals for followers, inverting and non-inverting amplifiers, summers, comparators and integrators.
Guided practicals: more than thirty step-by-step labs that load a circuit onto the board for you, from Ohm’s law to full adders.
RC transients: watch a capacitor charge in real time and compare it with the time constant τ = R × C.
Your workspace: undo and redo, a library of saved circuits, an activity timeline you can replay, notes, and “share as image”.

Made for phones as well as desktops

The breadboard supports tap-to-place, pinch-to-zoom and drag-to-pan, so it works on Android phones, tablets and desktop browsers. You can install it to your home screen and keep using it offline.

Who it is for

Students learning Ohm’s law and logic gates, teachers who want a quick demonstration without a lab bench, and hobbyists who want to test an idea before wiring real parts. Our classroom and self-study guide suggests a lab order.

Accounts and your data

You do not need an account. Your circuits are stored in your own browser. If you choose to sign in, your saved circuits and theme choice can sync between your devices. Details are in the privacy policy.

Good to know

Breadbit is a teaching tool. It uses simplified, idealised models so results are clear and fast; it is not a replacement for a full professional simulator or for testing real hardware.

Open the Breadbit simulator