ark

Ark UI is an open-source, headless component library maintained by the Chakra UI team. It supplies the unstyled logic and accessibility layer for building design systems and web applications, leaving all visual styling to the developer. **Core approach** The project separates component behaviour from appearance. Every component ships with no default styles, so teams can apply Tailwind, Panda CSS, CSS-in-JS solutions such as Emotion or Styled Components, CSS Modules, or plain CSS. The stated goal is to give design-system authors full control over presentation while inheriting tested interaction and accessibility behaviour. **Architecture** Component logic is built on Zag.js finite state machines. According to the README, this yields predictable and type-safe state transitions, easier testing and debugging, and fewer edge cases. The same component behaviour is exposed through separate packages for React, Solid, Vue and Svelte, so a design system can share one API surface across frameworks without rewriting logic. The packages are fully typed with TypeScript. **Accessibility** The README states that components follow WAI-ARIA design patterns and are tested with assistive technologies. Claimed features include appropriate ARIA attributes and roles, keyboard navigation, focus management, screen-reader announcements and RTL support. **Components** Ark UI advertises 45+ components grouped roughly as: - Layout and navigation: Accordion, Tabs, Splitter, Steps, Tree View, Tour - Overlays: Dialog, Popover, Tooltip, Hover Card, Bottom Sheet, Floating Panel - Forms and inputs: Checkbox, Radio Group, Select, Combobox, Number Input, Pin Input, Tags Input, Editable, File Upload, Color Picker, Date Picker, Password Input, Signature Pad, Slider, Angle Slider, Rating Group, Switch, Toggle and Toggle Group - Data display: Avatar, Highlight, Progress, QR Code, Format, JSON Tree View, Marquee - Utilities: Carousel, Clipboard, Collapsible, Field and Fieldset, Menu, Pagination, Portal, Presence, Scroll Area, Segment Group, Timer, Toast, Client Only, Download Trigger, Focus Trap, Frame, Collection, Listbox **Installation and usage** Each framework has its own npm package (`@ark-ui/react`, `@ark-ui/solid`, `@ark-ui/vue`, `@ark-ui/svelte`). Components are imported per component, for example `@ark-ui/react/dialog`, and composed from primitives such as Root, Trigger, Backdrop, Positioner, Content, Title, Description and CloseTrigger. The README shows a Dialog example rendered with near-identical markup in all four frameworks. **Ecosystem** Ark UI is the foundation for Chakra UI v3, and the README also mentions Park UI and Tark UI as styled component sets built on top of it. A separate integrations folder offers an MCP server for AI-assisted development. **Documentation and community** Guides, per-component API references, examples and styling recipes live at ark-ui.com. The project has a Discord community, a public Canny roadmap for feature requests, and a blog. Contributions are accepted through a contributing guide, and support flows through the documentation, Discord and GitHub issues. Development is funded via Open Collective, and the project is released under the MIT license.