Digital Logic Design
& IC Simulator
In your browser.
LogicBench is a free digital logic design simulator — real breadboards, 34 datasheet-accurate 74 series ICs, genuine C++ Arduino compilation, and live 555 timer physics, all running in your browser. The DLD lab simulator that’s open 24/7.
34
74-series TTL ICs simulated
100%
Real C++ Arduino compile
24h
Component requests, typically added
2
Modes — school & university
The IC simulator built for digital logic design.
LogicBench started as a simple breadboard simulator — and grew, through real student demand, into a complete digital logic lab: 34 74-series TTL ICs and counting, a real Arduino C++ compiler, sub-circuits, and physics that behaves like real hardware. Whether you’re studying for a DLD exam, running a lab session, or prototyping a real design, LogicBench is the IC simulator that matches how a real bench actually works — and it’s free.
34 74-series ICs — datasheet accurate
The complete 74xx TTL IC library, simulated down to real logic-level behavior. Not approximations — actual pin layouts and timing from the datasheet, so what works here works on your real bench.
Real Arduino compilation
A genuine C++ transpiler — Wire/I2C, SPI, EEPROM, Servo, LiquidCrystal, PWM, analogRead — your actual sketch runs, not a fake interpreter.
DLD lab simulator — open 24/7
Practice your digital logic design lab circuits any time. Wire a 7486 XOR gate, a 7474 D flip-flop, or a full adder built from 7483s — no lab booking needed.
Real burn & safety physics
Wire something wrong — say 20V into a 5V circuit — and the components actually burn out, the same way they would on a real bench.
Sub-circuits — build once, reuse anywhere
Save a circuit like a half adder, then drop it into any future build from the load menu — combine two to build a full adder in seconds.
School & university modes
A simplified, guided build with lesson panels for classrooms, and a full-depth IC simulator mode for advanced makers and engineering students.
Don’t see the component you need?
LogicBench’s library is always growing. If there’s an IC, sensor, or module you need that isn’t in the simulator yet, just email us — we typically add new components within 24 hours.
If it works here, it’ll work on your bench.
LogicBench is built to behave the way real components do. Supply 20V to a circuit designed for 5V, and everything on that path burns out — exactly like it would with real hardware. Use that to find the safe resistor and capacitor values before you ever pick up a soldering iron.
That makes it a real validation step, not just practice: build and test your full circuit in LogicBench, confirm it behaves the way you want, then buy the real components and wire them exactly as you did on screen — instead of guessing and burning parts you paid for.
5V → 20V
Overvoltage actually burns the part, just like real hardware.
Test → Buy
Validate the full circuit before spending money on parts.
Safe limits, found here first
Dial in the right resistor and capacitor values risk-free, before real components are on the line.
The complete 74xx TTL library, ready to wire.
LogicBench ships 34 datasheet-accurate 74-series ICs — the same chips on your DLD lab bench. Each IC is simulated at the logic-level with the correct pin layout, so the skills and circuits you build here transfer directly to real hardware.
Use it as a DLD lab simulator before your practical, or as a digital logic design sandbox year-round. Gates, flip-flops, counters, multiplexers, adders — if it’s in the 74xx family, it’s probably already here.
7400
Quad 2-input NAND
7474
Dual D flip-flop
7483
4-bit binary adder
7486
Quad XOR gate
74138
3-to-8 line decoder
74151
8-to-1 multiplexer
74163
4-bit synchronous counter
74195
4-bit shift register
Prototype your electronics project before you build it.
Whether you’re building your first LED blinker or designing a custom PCB with a dozen ICs, LogicBench is the electronics simulator that lets you prototype, break, fix, and perfect your circuit before a single real component is ordered — or burned.
Test it in simulation first
From traffic light controllers to binary clocks to custom logic puzzles — build your hobby electronics project in LogicBench, verify every signal, then take it to the real breadboard with confidence.
Code + circuit together
Write your Arduino sketch and wire up the circuit in the same simulator. Test your pinMode() calls, analogRead() inputs, and I2C LCD displays all in one place — without plugging in a single USB cable.
Validate before you fab
Before you commit to a PCB order, simulate the full logic in LogicBench. Catch wiring errors, verify IC pinouts, and confirm timing — so your first PCB run is also your final one.
Astable, monostable, bistable
The 555 timer in LogicBench is a live physics simulation — adjust R and C values and watch the frequency and duty cycle update in real time. Great for tone generators, oscillators, and LED flashers.
From gates to systems
Start with AND, OR, NOT gates and build upward: half adders, full adders, comparators, decoders. LogicBench makes it easy to see how simple gates combine into real digital systems.
From schematic to simulation
Got a schematic from a textbook or YouTube? Wire it up in LogicBench and see if it actually works before spending money at the components shop.
Digital logic simulator built for classrooms and workbenches.
School Mode
A friendly, guided interface with lesson panels and grade badges — built for students just getting started with breadboards, simple ICs, and their first Arduino sketch.
Learn more →University Mode
Full-depth simulation — all 34 ICs, complete timing physics, and full Arduino C++ compilation — for advanced students, hobbyists, and engineers prototyping real designs.
Learn more →One simulator. Many kinds of builders.
From first-year engineering students to seasoned hardware hobbyists — LogicBench meets you wherever you are in your electronics journey.
Engineering & CS students
Practice DLD lab circuits, combinational logic assignments, and sequential circuit designs before the actual practical. No lab hours wasted figuring out a wiring mistake you could have caught in simulation.
Electronics hobbyists
Design and test your next hobby project — whether that's a custom counter, a signal generator, or a logic puzzle game — entirely in your browser before buying a single component.
Arduino & maker community
Prototype your full Arduino project — code and circuit — in LogicBench. Test sensors, actuators, LCD displays, and serial communication before your hardware even arrives.
Teachers & lab instructors
Use LogicBench as a classroom digital electronics simulator: assign circuits, demonstrate concepts live, and let students safely experiment without risking real lab equipment.
Self-taught electronics learners
Learning from YouTube, books, or courses? LogicBench is the virtual lab where you put theory into practice — wire the circuit from the tutorial and see it work (or find out why it doesn't).
Embedded systems developers
Quickly validate peripheral wiring and microcontroller I/O logic before moving to real hardware. Combine Arduino sketch testing with IC-level circuit simulation in one free tool.
Everything you need in one free online electronics lab.
Most online circuit simulators either cover analog circuits or digital logic — rarely both, and almost never with real IC simulation and real Arduino support in the same tool. LogicBench is built around the 74xx TTL IC family from the ground up, with Arduino compilation added on top.
You get a virtual breadboard, a full TTL IC library, a working Arduino environment, a 555 timer simulator, and burn-out physics — all free, all in your browser, with no account required.
See the full comparison vs. Tinkercad & Wokwi →Start wiring in under a minute.
No signup walls. No installs. Just a breadboard and your ideas.
Launch the simulator