Features

One bench. Four ways to see electricity.

Every DigiSim lab shares the same real-time engine, the same editor, and the same save format. Learn the bench once — then simulate logic gates, relays, DC circuits and analog electronics without switching tools.

Start simulating — free See pricing
CORE · MATURE

Digital Logic — build the whole computer, not just the gates

An event-driven engine simulates every signal with per-component propagation delays, tri-state buses and contention detection. Wire your first AND gate, then keep going until an 8-bit CPU runs assembly you wrote.

  • 60+ components — gates, flip-flops, registers, RAM, ROM, 8-bit ALU
  • Live truth tables, oscilloscopes, 7-segment displays, 16×16 pixel screen
  • Assembly editor — load ROM and watch fetch, decode, execute
Open the Logic Lab →
A running 8-bit CPU circuit in DigiSim Logic Lab
MATURE · TESTED

Relay — logic you can hear click

Electromechanical computing on a real DC solver — Ohm and Kirchhoff on every wire. Coils pull, contacts latch, and authentic recorded relay clicks play as your ladder logic runs.

  • Real DC circuit solver — voltages and currents, not just on/off
  • 25 guided Blueprints — from one relay to a binary counter
  • Authentic relay click audio, recorded from real hardware
Open the Relay Lab →
An AND gate built from physical relays in DigiSim Relay Lab
NEW

Electricity — Ohm’s law you can see and measure

The physics course before the logic course. Build closed loops with batteries, bulbs, meters and rheostats — then watch current respond as you turn the dial. Perfect for physics classrooms and first-time learners.

  • Batteries, bulbs, switches, ammeters, voltmeters, rheostats
  • Live V, I and R readouts on every meter — series and parallel
  • Bulbs glow with real brightness — see power dissipation happen
Open the Electricity Lab →
A battery and glowing bulb experiment in DigiSim Electricity Lab
IN DEVELOPMENT

Analog — SPICE accuracy, browser speed

Op-amps, filters and transistors on an ngspice engine compiled to WebAssembly — the same solver trusted for real circuit design, running at interactive speed in your browser.

  • ngspice-accurate DC, AC and transient analysis
  • Op-amps, RC filters, diodes and transistors
  • Included in Pro & Founder the day it ships — no extra charge
Lock it in with the Founder deal →
An RC low-pass frequency response in DigiSim Analog Lab
The platform underneath

Everything around the simulation

Cloud save & sharing

Free circuits autosave locally with no account. Pro adds cloud save across devices, share links, and PNG/SVG/.digi export.

SimCast lessons

66 narrated lessons in 7 languages that stay fully interactive — pause anywhere and probe the running circuit.

AI circuit assistant

Ask for a debounce circuit or why your latch will not hold — the assistant reads your bench and helps wire and debug.

Embed anywhere

Every circuit embeds as a live, interactive simulator in your LMS, slides or blog — never a screenshot.

Templates & Blueprints

30+ logic templates and 25 relay Blueprints — load a full adder, a counter or an 8-bit CPU and start probing.

7 languages, 100+ docs

Full UI, lessons and component documentation in English, 中文, 日本語, Español, 한국어, Deutsch and Français.

Built for teaching

Talk to us about your class →

No student accounts

The free tier and all embeds work without sign-up — students click a link and start wiring.

$4 per seat, per year

Classroom plans add a teacher dashboard, bulk seats and SSO — with volume pricing from 20 seats.

Automatic edu discount

Academic emails (.edu, .ac.uk and friends) get a discount applied automatically at checkout.

Learn the bench once. Use it everywhere.

Start free in the Logic Lab — every other simulator uses the same bench.

Open the bench