Developed by Associate Professor of History David Trowbridge of Marshall University, Clio is a non-profit website and mobile app that guides users through historical and cultural sites across the U.S. Professional and amateur historians will take great interest in this open digital environment, which encourages collaboration between scholars and the community to document information and reach broader audiences than traditional publishing allows. Clio uses the location feature on a user's smartphone or browser to display information about sites and related historical events in the immediate area. Clio also allows users to browse nearly 5,000 entries by state, city, address, title, category, or tag. The platform features walking and driving tours that include audio, video or image slideshows to guide users through historical and cultural sites. Each entry features links to related entries and tours and information on topics of further interest. In the menu (which displays as a hamburger icon), visitors can also find reference materials for using the platform, tutorials on how to create entries and tours, links to grant resources, information on internships, details about supporters and how to contribute, and more. Clio is available for free on browsers or as an app for iPhone and Android.