Free Design & Prototyping alternatives
UI and product-design tools as alternatives to Figma and Sketch.
Common paid equivalents: Adobe InDesign.
Pencil Project
Design & PrototypingFree open-source desktop app for GUI mockups, wireframes and diagrams, with built-in UI stencils for web, Android and iOS.
Adobe InDesignPencil Project is a free and open-source tool for GUI prototyping and diagrams. It comes with ready-made shape collections for designing interfaces: web and desktop widgets, Android and iOS components, flowchart and UML shapes, and lets you build multi-page mockups that link to each other. Designs can be exported to PNG, PDF, SVG or HTML for sharing and simple clickable prototypes. It runs offline as a desktop app on Windows, macOS and Linux, and your files stay on your own computer. It is lighter than Figma and has no real-time team collaboration or cloud features, which makes it a good fit for quick wireframes and mockups rather than full product design.