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Wireframe Software

Pencil Project

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Open-source desktop GUI prototyping tool for creating mockups on major platforms

By Evolus

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About Pencil Project

Free desktop mockup drawing

Pencil Project is an open-source tool for building graphical user interface mockups. It was made to be free and easy to install, and it runs on popular desktop platforms, so a designer or developer can sketch the layout of an application without paying for a subscription service.

Stencils and tutorials

Mockups are built from stencils, and the project publishes a set of tutorials, organised by topic and with sample code, showing how to create new stencils of your own. That makes the tool extendable by its users.

Releases and downloads

The project's site offers downloads for several operating systems, including a Windows installer. Its latest stable release is version 3.1.1, which brought stability fixes and new features, and the release notes describe the changes. The version 3 line followed a development effort that began in November 2015, with release candidates and several point releases leading up to the stable version.

TrustList summary

Pencil Project is an open-source application for drawing mockups of graphical screens. It installs on popular desktop operating systems and is meant to be easy for anyone to pick up.

Features

  • Mockup drawing: The layout of an app can be sketched on the desktop without needing a subscription service.
  • Stencils: New stencils can be created, and a set of tutorials with sample code explains how to create them.
  • Cross-platform downloads: Downloads are provided for several desktop platforms.
  • Open development: The source is open, and release notes describe each version.

Key facts

  • Latest stable release listed: Version 3, dated October 2019
  • General availability of the version 3 line: February 2017
  • Development of the new version began: November 2015

Summary written by TrustList from the business's own published information, Nov 2026.

Categories & features

Trust Score

8/ 100
Trust Score: New

An earned signal from verification, reviews, awards, transparency and engagement - the vendor can't buy it.

Verification
0/100 · 20%
Reviews
0/100 · 30%
Awards
0/100 · 15%
Transparency
42/100 · 20%
Engagement
0/100 · 15%
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Updated 8/11/2026

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