Once UI is an open-source design system for building polished React products with less repetitive code. Compose layouts with readable primitives, use a shared system of components and design tokens, and keep the result consistent as your product grows. Version 2.0 gives both you and your coding agent a clearer way to work. Its component catalog, compact rules, and task guides help agents use the system correctly; its foundations and predictable APIs make the output easier for you to understand.

Once UI 1.5 is about bringing wonder back to UI engineering. We’re introducing new visual effects — weather, particles, matrix-style dots — all drop-in and usable in just a few lines of code. You also get a new generation of chart types built for live data and real-time dashboards. Only in Once UI. A toolkit for indie builders who want their product to feel alive, expressive, and unmistakably theirs.

Craft powerful interfaces with just a few lines of code and build world-class products as a solo developer. Once UI gives you the speed of a no-code tool—with the control of real code.

Transform your Figma projects with Once UI's templates and dynamic marketing mockups. A design paradigm that's more than a system – it's a revolution in production, workflow connectivity, and web inclusivity.

The design system you've been waiting for - Rooted in the principles of modern JavaScript frameworks, Once UI offers an advanced component-based design approach for Figma. Experience unprecedented customization and flexibility. Join the design revolution!

Focus on design while Once UI handles prototypes, documentation and handoff. Explore a framework for building world-class products, craft 'wow-worthy' prototypes, and hand off to developers without a glitch. Now 80% leaner & 100% smarter.