Descriptions:

The tool is called Napkin One. It is a web-based design tool that allows users to quickly create wireframes, mockups, and prototypes. It features a drag-and-drop interface, allowing users to quickly create and edit their designs. It also includes a library of pre-made components, allowing users to quickly add elements to their designs. Additionally, Napkin One includes collaboration tools, allowing users to share their designs with others and work together on projects.