If you look at the spice netlist, you will see that it has no comparator in it:  This is because you have chosen a schematic symbol with no spice model associated with it. Please ensure that you read the whole of the Simulation Tutorial before attempting simulation: [https://docs.easyeda.com/en/Simulation/Chapter1-Introduction/index.html](https://docs.easyeda.com/en/Simulation/Chapter1-Introduction/index.html) For more information on how to use simulation in EasyEDA please also see (2) in: [https://easyeda\.com/andyfierman/Welcome\_to\_EasyEDA\-31e1288f882e49e582699b8eb7fe9b1f](https://easyeda.com/andyfierman/Welcome_to_EasyEDA-31e1288f882e49e582699b8eb7fe9b1f)