whats the best free circuit simulation?

[ngspice.com]

Re: free circuit simulator

Interesting. While it is obviously a bit limiting having no schematic entry, it does give the ability to run simulations on a mobile phone or tablet PCB which could be handy from time to time.

Keith.

Right. And it can be a good tool for students learning how SPICE works. The site is in its early stages--there will be a lot more features added as time goes on.

 

[ahmad1954]

ltspice is one of the best free spice software.