Circuit design at the speed of thought
Tell Circ AI what you want in plain English. It generates the SPICE netlist, simulates the circuit, and renders the schematic — all in your browser.
Trusted by engineers and students from 30+ countries
How it works
Describe
“Design a headphone amp with warm tube-like tone” — or paste a SPICE netlist. AI generates the full circuit for you.
Simulate
Run industry-standard SPICE simulations instantly. Visualize waveforms and validate your design. All in your browser.
Iterate
“Increase the gain to 20dB” — refine your design through conversation until it's right.
Export
Export to KiCad for PCB layout or grab the raw SPICE netlist and keep moving.
Why Circ AI?
Skip the 20-minute LTspice startup ritual. Go from idea to validated design in your browser.
No setup, no install
No project files, no library hunting, no waiting for tools to load. Open a tab, type a description, get a simulation.
Design through dialogue
Ask “increase the gain by 6dB” or “add a bypass capacitor.” The AI modifies your circuit and re-simulates instantly.
Real SPICE, not a toy
Powered by ngspice — the same engine used in professional EDA tools. Transient, AC, and DC analysis with real component models.
Export to KiCad
When your design is validated, export the schematic to KiCad for PCB layout — or grab the raw SPICE netlist.
Simple pricing
Start free. Upgrade when you need more.
Top-up
$7.99 once
No subscription
Pro members pay just $5
- 12 circuit designs & revisions (no expiry)
- 10 saved circuits
- KiCad export
Pro
$19.99/mo
Billed monthly
or $12.42/mo billed annually
- 60 circuit designs & revisions/month
- Unlimited saved circuits
- KiCad export
Pro Annual
$149/yr
Just $12.42/mo — save $91/yr
- 60 circuit designs & revisions/month
- Unlimited saved circuits
- KiCad export
FAQ
- What counts as a “design & revision”?
- Every AI interaction counts as one — whether you’re creating a new circuit from a description or asking the AI to modify an existing one.
- What simulator do you use?
- We run ngspice — the open-source SPICE simulator used in academic and professional settings worldwide. It supports transient (.tran), AC frequency (.ac), and DC operating point (.dc) analysis.
- Can I import my own SPICE netlist?
- Yes. You can paste a SPICE netlist directly or drag and drop a .cir/.spice file. The AI can then help you modify and iterate on it.
- What components are supported?
- Resistors, capacitors, inductors, diodes, BJTs, MOSFETs, JFETs, op-amps (with realistic GBW models), voltage/current sources, and common ICs like the 555 timer and LM386.
- Is my circuit data private?
- Yes. Your circuits are stored in your account and are not shared or used for training. You can delete them at any time.
- Can I cancel my subscription?
- Yes, anytime. Your saved circuits remain accessible on the free tier after cancellation.
What will you build?
Describe it. Simulate it. Export it.
Try it free →