The best open source alternative to Sketch is Penpot. If that doesn't suit you, our users have ranked more than 50 alternatives to Sketch and 14 is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Sketch are Pencil Project, Penpot Desktop, Open Pencil and Akira.
Open-source design platform offering web-based and self-hosted workflows, code inspection in HTML and CSS, adaptive layouts with CSS Grid and Flex, real-time collaboration, auto layout features, reusable components, design tokens, layer support, plugins, and no tracking.
Pencil is a standalone app that lets you create diagrams or UI mockups. It doesn't have collaboration/multi-user features.
Penpot Desktop is an unofficial desktop application for the open-source design tool, Penpot.
Open-source design editor for vector and interface projects featuring AI-powered generation, .fig and .pen file support, design-to-code export, real-time P2P collaboration, linting, tokens, advanced programmability, Vue SDK, and privacy-friendly operation.
Akira is a native Linux Design application built in Vala and GTK. Akira focuses on offering a modern and fast approach to UI and UX Design, mainly targeting web designers and graphic designers. The main goal is to offer a valid and professional solution for designers who want to...
Alva works with your production frontend components, adding up-to-date, responsive, and interactive designs to your living styleguide.
Kleki is a multi-platform web app for painting and editing. It features: 4 different brushes; pressure sensitivity for Wacom tablets; up to 8 layers; numerous filters with real-time preview; import to PSD, PNG, JPEG; export to JPEG and PNG; upload to imgur.com; local storage.
Design browser-based HTML5 animations and videos using a user-friendly vector tool with rich timeline editing, real-time multi-user collaboration, and audio support. Access free animated assets, import diverse media, and export projects for web, social, or direct download.
All the features of other vector editing applications such as Adobe Illustrator or Inkscape, in a free, easy to use, powerful application.
Webchemy is an open-source cross-platform web-app for creating idea sparking sketches. Based on the desktop application Alchemy, Webchemy takes some of its drawing tools and brings them to the web. Webchemy is great for generating new ideas, but at some point it's better to...
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For free and open-source enthusiasts that won't go near proprietary software like Sketch or Figma, Penpot is the most advanced option out there.