A Box of Crayons for the iPad DigiTools is a set of physical coloring tools for the iPad that includes 3-D glasses and three apps. It is an effort by Crayola to bring the crayon's waxlike simplicity to touch-screen coloring, and a second chance to gain some needed credibility in digital creativity, after the poorly regarded iMarker. The business strategy behind DigiTools has become common - offer a free teaser app that will not work unless you visit a toy store and buy a physical product. In this case, it is a set of tools for $20, scheduled to be in stores in two weeks. From an iPad's point of view, each of the eight tools has a unique fingerprint provided by a set of capacitive feet. That is how it knows the difference between the Airbrush, a Sticker Stamp or the forklike Digital 3-D Stylus, which lets you doodle in 3-D, providing you're wearing the special glasses included with the kit. As with any standard capacitive tablet stylus, a tiny electrical charge is transferred from your skin to the screen, so no batteries are required. Because specific functions like airbrushing or stamping are paired directly with each tool, the tools do seem easier to use. Also, it is possible to save a coloring page and share it with Grandma through e-mail or Facebook. If she likes it, she could download the drawing, print it and stick it on her fridge. Just like the good old days.