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.
Pencil is shipped with Android and iOS UI stencils pre-installed. This makes it even easier to start protyping apps with a simple installation. Popular drawing features are also implemented in Pencil to simplify the drawing operations.
There are built-in shape collections including general-purpose shapes, flowchart elements, desktop/web UI shapes, Android and iOS GUI shapes.
Pencil also supports connectors which can be used to “wire” shapes together in a diagram. A collection of flowchart shapes are also available for drawing diagrams.
Key Features
- Bitmap and vector drawing tools.
- Layers.
- Camera.
- Export animations to QuickTime and Flash formats.
Website: pencil.evolus.vn
Support: Wiki
Developer: Pascal Naidon, Patrick Corrieri
License: GNU GPL v2 or later

Pencil is written in JavaScript. Learn JavaScript with our recommended free books and free tutorials.
Related Software
| GUI Prototyping Tools | |
|---|---|
| Penpot | Design tool that’s web based. Penpot requires a browser, that’s it. |
| Inkscape | Powerful design software with flexible drawing tools |
| Pencil | Easy GUI Prototyping with a good range of built-in shape collections |
| Akira | Design application for prototyping |
| Workbench | Prototype with GNOME technologies |
| mydraft | Wireframing tool |
Read our verdict in the software roundup.
Explore our comprehensive directory of recommended free and open source software. Our carefully curated collection spans every major software category.This directory is part of our ongoing series of informative articles for Linux enthusiasts. It features hundreds of detailed reviews, along with open source alternatives to proprietary solutions from major corporations such as Google, Microsoft, Apple, Adobe, IBM, Cisco, Oracle, and Autodesk. You’ll also find interesting projects to try, hardware coverage, free programming books and tutorials, and much more. Discovered a useful open source Linux program that we haven’t covered yet? Let us know by completing this form. |

