@hpoduszczak, **A little more information from you might help us to help you.** * There are many reasons why an LTspice spice netlist may not run in EasyEDA. All spice simulators are slightly - or hugely - different. 1) EasyEDA uses **ngspice** as the underlying spice simulation engine: http://ngspice.sourceforge.net/presentation.html Therefore, to get the best out of EasyEDA as a simulation tool, you will need to know something about the models and syntax of ngspice and the differences between this flavour of spice and others such as LTspice, SIMetrix and PSpice. It is recommended that you have a copy of the ngspice manual to hand: http://ngspice.sourceforge.net/docs/ngspice-manual.pdf 2) In the 'Functions' section of the EasyEDA Simulation eBook at: https://docs.google.com/document/u/1/d/1OWZVVFRAe_2NW3WratpkA_SGuHa5AcRow5ZRfvcoVTU/pub you will find a list of all the functions available in EasyEDA (most of which you have to copy and paste into the schematic and set to `Text type = spice`). Many of these have been created to be compatible with LTspice functions but not all are and not all functions that are available in LTspice are available in ngspice. 3) LTspice has many proprietary models (such as the VDMOS MOSFET model) which are not available in other simulators. 4) LTspice also has many encrypted device models which can only be run on LTspice. 5) The implementation of ngspice in EasyEDA does not support stepped simulations that can be run in LTspice.