The goal of this project is to create a circuit simulator that resides in the cloud. Implementation of this project will take place in the Google App Engine. Any of the languages supported by Google App Engine can be used to implement this project. The project is broadly divided into the user interface, the part that involves constructing the equations to solve the system, the frequency-domain engine and the time-domain engine. Further enhancements to the project can be made by implementing modules involving on-chip/off-chip transmission lines and power distribution networks.