I am a designer and need a full 100% authentic CAD software. Obviously I do not want the hassle of having to use my MacBook to work everytime and sometimes I get inspiration I want to immediately draw out. I found nothing good at all. AutoCAD is just a viewer. No SolidWorks, other programs can draw but not simulate the functions the way SolidWorks does. E.g. I want to simulate a gear system. I need it to move. No app like such can be found. Help?