pencil
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Description:
GUI prototyping tool
Type: Cask  |  Latest Version: 3.1.1@0  |  Tracked Since: Dec 28, 2025
Links: Homepage  |  formulae.brew.sh
Category: Developer tools
Tags: prototyping wireframing ui-design mockup gui
Install: brew install --cask pencil
About:
Pencil is an open-source GUI prototyping tool that allows designers and developers to quickly create wireframes and mockups. It features a built-in collection of SVG-based stencil collections for various platforms, including desktop, mobile, and web. The tool supports the creation of interactive prototypes with linking between pages, facilitating the visualization of user flow and application structure.
Key Features:
  • Cross-platform stencil collections for rapid UI design
  • Interactive prototyping with inter-page linking
  • Export options to PDF, PNG, SVG, and OpenDocument formats
  • WYSIWYG diagramming with native look and feel
Use Cases:
  • Creating low-fidelity wireframes for early-stage product design
  • Demonstrating user navigation flows to stakeholders
  • Mocking up desktop or mobile application interfaces
Alternatives:
  • Balsamiq – Balsamiq offers a distinct hand-drawn sketch aesthetic but is proprietary and paid.
  • Figma – Figma is a cloud-based, high-fidelity design tool with real-time collaboration, requiring a subscription for full features.
Version History
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