Circuit Solver is described as 'uses a simple drag and drop approach to building circuits. Simply drag the elements from the tool box onto the screen where you can wire and edit their values. Afterwards, hit the play button to simulate the circuit'. There are five alternatives to Circuit Solver for a variety of platforms, including Mac, Windows, Linux, Online / Web-based and Android. The best alternative is Fritzing. It's not free, so if you're looking for a free alternative, you could try Circuit Simulator or Everycircuit. Other great apps like Circuit Solver are Circuit Solver Web (Free) and ECStudio (Paid).