# Circ AI

> AI-powered circuit design tool. Describe a circuit in plain English, simulate with SPICE, and export to KiCad.

## About

Circ AI is a browser-based analog circuit design platform. Users describe what they want to build in natural language, and the AI generates a SPICE netlist, runs an ngspice simulation, renders the schematic, and displays waveform results. Users can iterate on designs through conversation ("increase the gain to 20dB") and export finished circuits to KiCad for PCB layout.

## Key Features

- Natural language circuit design (describe in English, get a working simulation)
- Industry-standard ngspice SPICE simulation (transient, AC, DC analysis)
- Interactive schematic viewer
- Waveform visualization
- KiCad schematic export
- PDF export (schematic + waveforms)
- Netlist drag-and-drop import (.cir/.spice files)
- Iterative design through conversation

## Supported Components

Resistors, capacitors, inductors, diodes, BJTs (NPN/PNP), MOSFETs (NMOS/PMOS), JFETs, op-amps with realistic GBW models, voltage sources, current sources, 555 timer, LM386 audio amplifier.

## Pricing

- Free: 3 designs & revisions/month, 3 saved circuits
- Top-up: $7.99 one-time for 12 designs (no expiry), 10 saved circuits (Pro members pay $5)
- Pro: $19.99/month for 60 designs/month, unlimited saved circuits
- Pro Annual: $149/year ($12.42/month effective)

## Links

- Homepage: https://circai.ai
- Sign up: https://circai.ai/sign-up
- Terms: https://circai.ai/terms
- Privacy: https://circai.ai/privacy
- Contact: contact@circai.ai