Pencil Project Overview
Pencil (Pencil Project) is a free, open-source GUI prototyping and diagramming tool for Windows and macOS used to create wireframes and mockups of user interfaces. It provides built-in stencil collections of common UI elements — buttons, forms, dialogs, and more, in different styles including desktop, web, and mobile — that you drag onto a canvas to sketch app and website layouts. It supports linking pages together to simulate navigation, adding shapes and text, and exporting prototypes to formats like PNG, PDF, and HTML. As a no-cost wireframing option, it is popular with students, designers, and developers planning interfaces. The complete installer means Pencil Project sets up without fetching anything online during installation. It also supports inter-page links and a collection of community-contributed stencils for additional UI styles. The link on this page goes to Evolus's official Pencil Project download.