LogicBench vs. Tinkercad vs. Wokwi
Most free online circuit simulators trade accuracy for accessibility. LogicBench takes the opposite position: professional-grade simulation delivered at zero cost. Here’s how it actually compares to the tools you’ve probably already tried.
| Capability | LogicBench | Tinkercad | Wokwi (free) |
|---|---|---|---|
| Real C++ Arduino compilation | Yes | Block code only | Yes |
| 34-IC 74xx TTL library | Yes | No | No |
| 555 timer RC-physics model | Yes | Simplified | Limited |
| IR sensors & buzzer modules | Yes | Limited | Yes |
| SPICE-style analog nodal solver | Yes | No | No |
| Component burn / overvoltage physics | Yes | No | No |
| Free, no signup required | Yes | Account required | Account required |
Comparison reflects each tool’s publicly documented free-tier capabilities.
C++ Arduino compilation vs. block-based visual coding
Several popular simulators offer “Arduino simulation” through a Scratch-style block-coding interface — accessible, but it doesn’t translate to or from real Arduino firmware. Students who learn circuit behavior through block code can’t transfer that knowledge directly to professional firmware development.
LogicBench executes real Arduino C++ sketches — the same setup() / loop() functions and digitalWrite, digitalRead, analogWrite, analogReadcalls you’d deploy to physical hardware. The sketch transpiles to a JS generator function and runs tick-by-tick against the live circuit model, driving any connected component with zero extra configuration.
High-fidelity 74xx IC simulation vs. basic logic primitives
Many online simulators offer a handful of abstract AND/OR/NOT primitives — useful for Boolean algebra, but they model no real IC: no pin numbers, no DIP package layout, no enable logic, no tri-state outputs.
LogicBench simulates 34 distinct 74xx TTL ICs with DIP pin assignments that match real datasheets. Place a 74138 decoder and every pin behaves exactly as specified by Texas Instruments. Place a 7474 D flip-flop and the asynchronous PRE/CLR overrides work correctly at every clock edge — the fidelity needed for pre-lab verification of real DLD practicals.
Component burn physics: simulating hardware destruction
Most simulators silently ignore incorrect wiring — an LED tied directly to 5V with no current-limiting resistor just glows, teaching that the mistake is harmless.
LogicBench’s burn physics engine monitors voltage and current across every component on every tick. An overvoltage LED visually burns out and stops conducting; ICs subjected to incorrect supply voltage or pin violations enter a fault state — teaching the habit of protecting components before powering a circuit.
555 timer RC physics vs. simplified toggle outputs
Some simulators include a “555 timer” whose output just toggles at a user-entered frequency, ignoring the underlying RC circuit — the resistor and capacitor values you choose have no effect.
LogicBench implements the real RC timing equations from the NE555/LM555 datasheet. In astable mode, frequency is f = 1.44 ÷ ((R1 + 2×R2) × C), with high-state period T_HIGH = 0.693 × (R1 + R2) × C and low-state period T_LOW = 0.693 × R2 × C. Monostable pulse width is T = 1.1 × R × C. Change R or C in the inspector and the frequency updates live — the same math used in professional SPICE simulators.
Real sensors and a SPICE-style analog engine
Many free simulators represent sensors as simple scripted behaviors — an IR sensor that just flips a boolean when “something” is nearby, with no real electrical model behind it.
LogicBench models IR break-beam transmitter/receiver pairs, an IR obstacle-avoidance module, and a piezo buzzer on top of a genuine node-voltage (nodal) analog solver, with Lambert-W diode math for LEDs and diodes in series with resistors — the same class of approach professional SPICE-class simulators use. Analog subnetworks are actually solved, not faked, before their digital-level state is read by your circuit or Arduino sketch.
Complete 74xx IC library, plus sensors & modules
Every IC below is independently simulated with correct pin counts, accurate logic behavior, and DIP package pin assignments.
NAND Gates
- 7400Quad 2-input NAND — Y = ¬(A·B), 4 independent gates
- 7410Triple 3-input NAND — Y = ¬(A·B·C)
- 7420Dual 4-input NAND — Y = ¬(A·B·C·D)
- 7430Single 8-input NAND
AND Gates
- 7408Quad 2-input AND — Y = A·B
- 7411Triple 3-input AND — Y = A·B·C
- 7421Dual 4-input AND — Y = A·B·C·D
NOR Gates
- 7402Quad 2-input NOR — Y = ¬(A+B)
- 7427Triple 3-input NOR — Y = ¬(A+B+C)
OR, XOR, XNOR Gates
- 7432Quad 2-input OR — Y = A+B
- 7486Quad 2-input XOR — Y = A⊕B, parity & adders
- 74266Quad 2-input XNOR (open-collector)
NOT Gates / Inverters
- 7404Hex inverter — Y = ¬A, 6 independent inverters
- 7414Hex Schmitt-trigger inverter — hysteresis for noisy inputs
Flip-Flops & Latches
- 7474Dual D flip-flop, edge-triggered, async PRĒ/CLR̄
- 7476Dual JK flip-flop, async preset & clear
- 74373Octal transparent D latch, 3-state outputs
Decoders & Demultiplexers
- 741383-to-8 line decoder/demux, 3 enable inputs
- 74139Dual 2-to-4 line decoder/demux
Encoders & Multiplexers
- 741488-to-3 priority encoder
- 741518-to-1 multiplexer with strobe
- 74153Dual 4-to-1 multiplexer
Counters & Shift Registers
- 74193Sync 4-bit up/down counter, parallel load
- 741944-bit bidirectional universal shift register
Arithmetic ICs
- 74834-bit binary full adder, cascadable carry
- 74854-bit magnitude comparator (A>B, A=B, A<B)
Display Drivers
- 7447BCD-to-7-segment decoder/driver, common anode
Bus Interface & Buffer ICs
- 74245Octal bus transceiver, bidirectional, 3-state
- 74125Quad 3-state buffer, active-low enable
- 74126Quad 3-state buffer, active-high enable
- 74240Octal inverting buffer/line driver, 3-state
- 74244Octal non-inverting buffer/line driver, 3-state
- 74541Octal buffer/line driver, separate OE pins
Timer IC
- 555 TimerAstable & monostable, physics-accurate RC timing
Sensors & Modules
- IR Break-Beam Tx/RxInfrared emitter/detector pair for beam-interruption sensing
- IR Obstacle AvoidanceReflective IR proximity module
- Piezo BuzzerTone output, PWM or digital-pin driven
- DS3231 RTCI2C real-time clock module
- I2C LCD / Parallel LCD16x2 or 16x4, over I2C or HD44780 parallel
Frequently asked questions
Does LogicBench simulate sensors like IR modules and buzzers?
Yes. LogicBench includes an IR break-beam transmitter/receiver pair, an IR obstacle-avoidance module, and a piezo buzzer, all wireable to Arduino digital pins or straight into a breadboard circuit.
Does LogicBench use a SPICE-style analog engine?
Yes. Analog subnetworks — LEDs, resistors, capacitors, and sensor circuitry — are solved with a genuine node-voltage (nodal) solver and Lambert-W diode math, the same class of technique professional SPICE simulators use, rather than scripted approximations.
Is LogicBench free to use?
Yes. LogicBench is completely free with no subscription, login, or download required. It runs entirely in the browser.
Can LogicBench simulate real C++ Arduino code?
Yes. LogicBench compiles and executes real Arduino C++ sketches, not block-based code. You write setup() and loop() using digitalWrite, digitalRead, analogRead, analogWrite, and delay, and the sketch runs against the live circuit model in real time.
How does LogicBench compare to Tinkercad for Arduino simulation?
Tinkercad uses a Scratch-style block-coding interface aimed at beginners. LogicBench executes professional C++ Arduino sketches directly, and adds a 34-IC 74xx TTL library plus component burn physics that Tinkercad doesn't model.
How does LogicBench compare to Wokwi?
LogicBench provides a complete 34-IC 74xx series TTL library — decoders, counters, shift registers, bus transceivers, and arithmetic ICs — along with physics-accurate 555 timer simulation and component burn physics, capabilities not available in Wokwi's free tier.
What 74-series ICs does LogicBench simulate?
34 74xx TTL ICs: 7400, 7402, 7404, 7408, 7410, 7411, 7414, 7420, 7421, 7427, 7430, 7432, 7447, 7474, 7476, 7483, 7485, 7486, 74125, 74126, 74138, 74139, 74148, 74151, 74153, 74193, 74194, 74240, 74244, 74245, 74266, 74373, 74541 — plus the 555 Timer IC.
What is the 555 timer formula for frequency?
In astable mode, frequency is f = 1.44 ÷ ((R1 + 2×R2) × C), where R1 and R2 are in ohms and C is in farads. LogicBench computes this live from the resistor and capacitor values you place on the breadboard.
Does LogicBench simulate component damage and burn?
Yes. An LED connected without a current-limiting resistor visually burns out, teaching the habit of protecting components before applying power — a feature most free online circuit simulators don't model.
Can I combine Arduino with digital logic gates in LogicBench?
Yes. Place an Arduino Uno, write a C++ sketch, and wire its digital pins directly to 74xx ICs, LEDs, or any other breadboard component. digitalWrite() calls propagate into the circuit net in real time.
What file format does LogicBench use for saving circuits?
Circuits save as standard JSON files, so you can save, share, version-control, and reload any circuit, or embed one as a reusable sub-circuit inside a larger design.
Is LogicBench good for DLD lab practicals?
Yes — accurate breadboard topology, correct 74xx pin assignments, a combo-export truth-table generator, and a pre-lab verification workflow make it a practical substitute for physical DLD lab time.
See it for yourself.
No signup walls. No installs. Just a breadboard and your ideas.
Launch the simulator