Anyone with a sewing machine and a little time can build beautiful, colorful, and comfortable cushions. This app should aid that process. The "eBook" tab opens a 15,800 word instruction manual with lots of illustrations and construction detail. The "Calculator" tab gives access to the most accurate way to determine the yardage needed for any box cushion project. There has never been an easier or more accurate way to gauge needed fabric. And patterns for cutting are generated that make optimum use of the fabric. Depending upon the firmness and the thickness of the filler used, plate and boxing sizes are adjusted so fit and finish remain consistent no matter how diverse the cushion elements. And pattern repeats are automatically centered and matched top to bottom cushion to cushion! The "Video" tab lists all the Sailrite web videos that clearly demonstrate techniques. Finally, the "Sailrite" tab leads directly to the Sailrite Web Site where fabric choices can be made and supplies ordered.