Paint tester pots are great, but you could end up trying loads before you find that perfect color. Free apps for home decorating not only have the advantage over tester pots in that there is no cost involved, but you can also play around to your heart’s content with a mass of colors. Colorsnap is produced by the paint company Sherwin Williams. As well as having a database of existing colors, you can also take pictures of colors that inspire you and find a match. Other paint companies produce similar apps.