About Pencil Project
Pencil Project is an open source GUI prototyping tool for creating mockups of desktop and web interfaces. It is free to download and use, and the source code is available on GitHub.
What it does
Pencil helps you sketch interface layouts, wireframes and mockups on a canvas. You can use stencil libraries and templates to start faster. The latest stable release includes built-in AI support, which lets connected AI assistants create and edit mockups directly on the canvas.
Key features
- Create GUI mockups for desktop and web layouts
- Stencils and templates to start quickly
- Connect AI assistants to edit the canvas
- Downloads for Windows and other platforms
Who it's for
Pencil suits designers, product managers and developers who need a free tool for quick mockups. It is also useful for teams that want an open source option they can inspect, adapt or contribute to.
Pricing and good to know
Pencil is free and licensed under GPL-2.0. The Windows build is a sizeable download, about 149 MiB at the time of the latest release listing. Because it is a desktop application, you install it on each machine you use, and the project's documentation and downloads are kept on its own website.
Highlights
- Create GUI mockups for desktop and web layouts
- Use stencils and templates from the project site
- Let connected AI assistants edit the canvas
- Install builds for Windows and other platforms
