Hi ALL, After 8 years , EasyEDA has more than 600K users , Every day, there are thousands of projects from an idea to a PCB. EasyEDA's schematic and PCB are good enough for newbie and EE, next big step we will make the simulation be powerful too. After a long research, we decide to switch the the simulation engine from Ngspice to LTSPICE, LTSPICE is the best free spice simulation in my opinion, Thanks Mike Engelhardt allows EasyEDA to use LTSPICE . What will be. 1. We will redesign EasyEDA simulation interface, almost of all the old circuits maybe need to change a bit litter. 2. We will have more simulation models. 3. We will support to import LTSPICE schematic and symbols Ngspice is good, but LTSPICE is better. the new simulation will be released in 2 months. Thanks.