The CAD marketplace is getting very busy and it's becoming increasingly difficult to know which program is best for you. Here's how Inventor, Inventor LT, Fusion 360 and Solidworks compare. Inventor was introduced in 1999 as a CAD application for creating 3D prototypes in product development. Autodesk released Inventor LT, the lighter, streamlined version of Inventor in 2007. Fusion 360 hit the market in 2013 and was the first 3D CAD tool of its kind, offering users cloud storage as a means to improve access, collaborative projects and interoperability across multiple systems. While Autodesk's products often complement each other, Solidworks directly competes.