An open-source GUI prototyping tool that's available for ALL platforms.

Pencil is built for the purpose of providing a free and open-source GUI prototyping tool that people can easily install and use to create mockups in popular desktop platforms.

The latest stable version of Pencil is 3.0.1 which is a complete rewrite with many added features.

For other platforms? See all downloads »

Project News

Feb 20, 2017 Pencil 3.0.0 GA is now released.

Feb 09, 2017 Pencil 3.0.0 rc2 is available for testing.

November, 2015 Development for the new version of Pencil started.