Belle

​Radix UI is an open source component library optimized for fast development, easy maintenance, and accessibility. It offers two main packages, Radix Primitives and Radix Themes. Radix Primitives is a low-level UI component library focused on accessibility, customization, and developer experience. Components adhere to WAI-ARIA design patterns, are unstyled by default, and provide full keyboard navigation. Radix Themes is a pre-styled component library designed to work out of the box with minimal configuration. It includes layout primitives, typography, and components like buttons and cards, all customizable via the Theme component. Radix Colors offers a comprehensive, accessible color system for designing beautiful, accessible websites and apps. It supports automatic dark mode, transparent variants, and is designed for user interfaces. Radix Icons provides a crisp set of 15×15 icons available as individual React components.

Untitled UI is the world’s largest Figma UI kit, React component library, and icon system, offering designers and developers everything needed to design and build modern interfaces at speed. The Figma library features over 900 global styles and variables for color, typography, and effects, more than 10,000 meticulously crafted components and variants, 420 ready‑to‑use desktop and mobile page examples, and 4,600 neutral icons and logos, fully integrated into one design system. On the development side, Untitled UI React provides an open‑source collection of production‑ready components built with React v19.1, Tailwind CSS v4.1, TypeScript v5.8, and React Aria, ensuring type safety, accessibility (keyboard navigation and screen‑reader support), and lightning‑fast performance without lock‑in. AI‑ready Lovable and bolt.new kits enable instant prototyping with simple prompts, while seamless Figma previews and consistent styling across both platforms.