BlockFab-HD acts as a tool to assist in determining the amount of fabric needed to make quilt blocks with the added bonus of testing different colors and layouts for your quilt. BlockFab-HD has a library of 70 traditional block/patch designs to choose from. By choosing the number and size of blocks, BlockFab-HD will determine the amount of fabric needed and provide hints on cutting. Various sample layouts while varying colorways, layout styles, number of blocks, and pairing of blocks are possible allowing you to view thousands of possible variations. A Slideshow features can cycle through the variations automatically. Allows for metric measurement. Screen shots of your preferred layout can be saved.