Describe a circuit in any language, photograph a schematic or sketch one — CircuPilot builds it and runs a real ngspice simulation, with a SPICE netlist you can copy into LTspice. Arduino and AVR code runs too. Free, in your browser, nothing to install.
Streamline your hardware R&D cycle. Go from high-level system specs to functional, simulated schematics in seconds.
Describe your circuit requirements in natural language. CircuPilot automatically generates electrical netlists and structures, complete with topological self-healing features.
Just speak your thoughts. Convert voice inputs and speech transcripts directly into responsive electronic schematics on our interactive canvas.
However the circuit got here — drawn, photographed, typed or spoken — the netlist panel shows standard SPICE you can copy in one click and run in LTspice, ngspice, or anything else. Your work leaves with you.
Sketch the circuit the way you would on paper, label the values, and press one button. CircuPilot reads the drawing, builds a real editable schematic, and simulates it — no component palette, no wiring by hand.
Photograph a schematic from a textbook, a whiteboard, or a datasheet and CircuPilot reads the components and their values, rebuilds the circuit on the canvas, and simulates it — free, and without placing a single component yourself.
Instantly export industry-standard SPICE netlists for circuit simulation, layout, and seamless external EDA tool compatibility.
Run immediate transient analysis and DC operating point simulation. Monitor circuit waveforms and live ngspice terminal outputs directly inside the browser.
Analyze signal behaviors, voltage drops, and frequency responses with auto-assigned physical parts, stress markers, and component parameters.
Perfect for quick prototyping and electrical engineering students to master circuit design, SPICE netlists, and circuit theory visually — photograph a circuit from a problem set and simulate it before you hand the work in.
Compile your Arduino code and upload it directly to a real Arduino Uno or Nano over USB — no Arduino IDE required.
Learn how →Go from a description, a voice note, or a photo to a verified engineering simulation in minutes — free, in the browser, with nothing to install.
Sketch the circuit on the built-in drawing pad, attach a photo of a schematic from a book or whiteboard, type a description in any language, or record a voice note.
Text, speech, or an image is turned into topologies, parts, and pin connections — validated before it reaches the solver.
Visualize the design immediately on an elegant, auto-routed electronic schematic grid layout.
A standards-compliant SPICE netlist is compiled in real time, with a one-click Copy — paste it into LTspice or ngspice and it runs there too.
Execute instant ngspice transient and DC analyses inside the browser with zero external setups.
Observe gorgeous responsive waveform graphs and analyze current and voltage charts immediately.
Your circuit doesn't have to stay on the screen.
Build an Arduino circuit with AI, test it in the browser, generate and compile the firmware, then upload it directly to your Arduino Uno or Nano.
Program an Arduino →Whether you are learning the ropes or designing complex systems, CircuPilot accelerates your engineering throughput.
Grasp circuit theory, analyze electrical behaviors, and master SPICE simulations easily.
Prototyping next-gen DIY electronics and hardware designs rapidly without manual wiring hassle.
Synthesize innovative electrical schematics and generate instant netlists for research publications.
Accelerate complex industrial system designs with highly responsive AI-assisted CAD workflows.
Demonstrate electronic schematics and dynamic waveforms directly on the fly in engineering classes.
CircuPilot bridges large language models with industry-standard SPICE simulation, so you can focus on architecture while the AI handles wiring, component mapping, and verification.
Why verification matters is measured, not assumed: in our paper “Validation and Simulation Catch Different Errors: Four Levels of Evaluation for LLM-Generated Circuits” (arXiv, 2026), about one in ten AI-generated circuits simulated without a single warning while being wired wrong. CircuPilot checks the structure of every circuit as well as simulating it.
See how CircuPilot brings natural language synthesis, real ngspice simulation, and embedded microcontrollers together in one free browser tab.
| Capability | CircuPilot | Tinkercad | Falstad | LTspice | Wokwi |
|---|---|---|---|---|---|
| Environment | Browser (Zero install) | Browser | Browser | Desktop application (Windows / macOS) | Browser |
| AI Input (Text, Photo, Sketch) | ✓ Built-in (Text, Photo, Sketch) | ✗ None | ✗ None | ✗ None | ✗ None |
| Analog Simulation Engine | ✓ Real ngspice | ⚠ Basic circuit models | ⚠ Interactive circuit solver | ✓ Native SPICE engine | ⚠ Limited analog simulation |
| Microcontrollers & Embedded | ✓ Uno, Nano, ATmega16/32 | ⚠ Arduino Uno | ✗ None | ✗ None | ✓ Uno, Nano, ESP32 & more |
| Physical Hardware Upload | ✓ Web Serial (Direct in browser) | ✗ None | ✗ None | ✗ None | ⚠ Wokwi Bridge companion |
| Account Required to Test | ✓ Free guest access | ✗ Account required | ✓ Free guest access | ✓ Desktop install (no login) | ✓ Free guest access |
Yes, free. Photograph a schematic from a textbook, a whiteboard, or a datasheet and attach it in the chat box. CircuPilot reads the components and their printed values, rebuilds the circuit on the canvas, and simulates it with ngspice — you never place a component or drag a wire. It runs in the browser with nothing to install and no account needed to try it. Every other tool makes you rebuild the circuit yourself before you can simulate anything, or charges per schematic to trace it for you.
No. LTspice is a Windows and macOS download from Analog Devices, and there has never been an official web version, a cloud build, or a Linux build. Pages promising “LTspice online” are either a different simulator, a remote desktop streaming a Windows session, or a download link. If what you need is real SPICE results in a browser rather than LTspice specifically, CircuPilot runs ngspice in the browser and gives you a standard netlist you can copy into LTspice later. For switch-mode power supply design, install LTspice — its model library and solver speed are better. The full answer is here, and if you are looking for an LTspice online alternative, you can compare the two approaches side by side.
Yes. CircuPilot has a drawing pad: sketch the circuit the way you would on paper, label the values — “9V”, “330”, “LED” — and press Use this drawing. It reads the sketch, builds the schematic on the canvas, and simulates it with real ngspice. Black on white reads best. This is the same reader that handles photographed schematics, so a rough mouse drawing works: a wobbly 9 V battery, 330 Ω resistor and LED came back with the right values and the right series topology. No signup is needed to try it. How it works, and what it struggles with.
Most browser simulators — such as Falstad, EveryCircuit, or CircuitLab — require you to manually place and wire every component by hand. CircuPilot provides built-in optical schematic recognition: photograph a schematic or draw one on the canvas pad, and it reconstructs an editable circuit for simulation. Recognition accuracy depends on schematic clarity, component labels, and circuit complexity. How it works, and where it is weak.
Yes. AND, OR, NOT, NAND, NOR, XOR and XNOR all simulate, and you can give a gate a real package number — 74LS08, 74HC00, 74LS04 and others. The part number is not cosmetic: 74LS is TTL and switches near 1.5 V while 74HC is CMOS and switches near half the supply, so the simulation changes with the chip you pick. Gates are allocated into packages automatically and labelled U1:A, U1:B and so on, so you can see how many chips a circuit needs. Propagation delay and fan-out are not modelled. Truth tables and the common mistakes.
Yes. Whatever you started from — a drawing, a photo of a schematic, a typed description or a voice note — the netlist panel below the canvas shows standard SPICE with a one-click Copy button. Paste it into LTspice, ngspice, or any tool that reads a netlist. Nothing about the output is proprietary, so a circuit you build here is not stuck here. That also makes photographing a schematic a fast way to get a netlist for a tool that cannot read images itself.
Yes. CircuPilot runs entirely in the browser and simulates with ngspice, the same open-source engine behind most SPICE tools. It is free to start as a guest with generous daily quotas, no installation, and no licence key needed — which matters if you are on a university lab machine or a computer you cannot install software on.
It can, but the useful question is whether the result simulates. CircuPilot never asks the model for SPICE directly: generation returns a typed intermediate representation whose component types are a closed set, and the converter emits only models it defines, so a generated circuit cannot reference one that does not exist. Asking a language model for a netlist directly gives you text that often looks right and fails to run.
Proteus is paid and Windows-only, and LTspice is a desktop application. CircuPilot provides free browser-based access with daily quotas, covering analog, digital logic and Arduino/AVR circuits in one unified tab, working across Windows, macOS, Linux, and Chromebooks.
Yes. CircuPilot compiles your Arduino sketch and runs it on an AVR emulator in the browser, with the MCU pins driving the components on the schematic — LEDs, seven-segment displays, switches and buttons all respond as the firmware runs.
Yes. Describe your circuit in any language — Spanish, Arabic, French, Turkish, Persian — and the explanation comes back in the same language. The circuit itself is language-independent.
Yes. CircuPilot supports direct hardware flashing via the Web Serial API in Chromium browsers (Chrome, Edge, Opera). You can compile your Arduino Uno or Nano sketch in the cloud and upload it straight to your physical board over USB with no Arduino IDE installation required.
Tinkercad is built around intuitive visual breadboards with an account requirement; Falstad focuses on interactive qualitative circuit exploration; Wokwi specializes in microcontroller and embedded systems firmware with limited analog simulation. CircuPilot combines natural-language circuit generation (text, photo, or sketch), authentic ngspice analog simulation, and AVR register-level emulation (ATmega16/ATmega32 and Uno/Nano) with instant guest access.
Yes. CircuPilot models the LM35 precision temperature sensor (10 mV per degree Celsius) and photoresistors (LDR) following real datasheet lux-resistance curves. In embedded circuits, the MCU ADC reads the sensor pin voltage in real time.
