Books That Grow is an online educational platform that offers digital books that adapt to readers' abilities. Using this learning management system, two people reading the same title may see entirely different words, sequences of ideas, or illustrations, depending upon their individual learning profile. The application focuses specifically on the needs of adults with low literacy, a population under-served by leading publishers. Subscription is free, and the site seeks to help users become better readers, allow educators measure students' abilities and track their progress. The company is headquartered in Menlo Park, California, but incorporated in Delaware.