Lego Digital Designer is a freeware computer program produced by the Lego Group as a part of Lego Design byME. It is available for macOS and Windows, but only as a 32-bit application, which means that it no longer runs on current versions of macOS. The program allows users to build models using virtual Lego bricks, in a computer-aided design like manner. Until January 16, 2012, these could be uploaded, along with instructions and a box design, to the Lego Design byME website, from where the models could be ordered for delivery as a real, packaged set. Users can also take screenshots of their models and store the models on their computer in an .LXF file.