Curated frontier models benchmarked on electrical work.
Ask for a change. Watch it check itself.
A real editor you can take over at any point. Every example below goes through a real ngspice verification.
a 5 V indicator LED at about 12 mA
Simple enough to learn on. Exact enough to ship.
Either way, the same thing underneath: a SoTA agent that knows real parts, and a local solver that checks its work.
Ask in plain words. It shows the working and says when a change would cook a component, so you come away with the reasoning.
Values come back from ngspice against named limits, and the project is a folder you own: Python plus positions, exported as SPICE, PNG or SKiDL.