Spinner

1. 01Visual indicator — A clear representation that content is loading or in progress of change
2. 02Text — Explaining the loading state
3. 03Time — Determine how long the time between two actions must be to require a loading component
4. 04Accessibility — Ensure your loading state can be clearly seen
5. 05Visuals — Entertain the user with an illustration during the loading state

Checks from checklist.design, MIT.

• Astryx · Meta's open-source React + StyleX design system, 150+ components and 42 templatesS
• Chakra UI · 114 accessible React components with a token-driven styling systemS
• Kumo · Cloudflare's production React library: 44 components on Base UI + Tailwind v4, MITS
• The Component Gallery · 60 UI components cross-referenced against 95 real design systemsS
• Coss UI · Cal.com's design system: 60 Base UI primitives shipped as a shadcn registryS
• daisyUI · 68 pure-CSS Tailwind components as semantic class names, MIT, with 35 built-in themesS
• GPUI Component · 60+ Rust desktop UI components for GPUI, with a 200K-line code editor and chartsS
• HeroUI (formerly NextUI) · 71 React components on React Aria + Tailwind v4, with an MCP serverS
• HyperFrames · Apache-2.0 framework that renders HTML compositions to deterministic MP4, built for agentsS
• Intent UI · 80+ React Aria components with real ARIA semantics, MIT and copy-pasteS
• Kibo UI · shadcn registry of 41 complex components: Gantt, Kanban, editor, sandbox, cropperS
• Loading UI · 47 MIT-licensed React loaders, spinners and skeletons via shadcn CLIS
• Mantine · 150+ styled React components, 70+ hooks, CSS modules, no runtime CSS-in-JSS
• Material Design 3 · Google's open design system: 39 components, tokens, and Compose/Web codeS
• MUI · React component suite: Material UI, MUI X data grid, charts and date pickersS
• NameThatUI · Visual dictionary that maps 76 web and macOS UI elements to their real names and codeS
• Neobrutalism (ex RetroUI) · Neo-brutalist shadcn registry: 60 free components, 158 Pro blocks, 6 templatesS
• remocn · 282 Remotion components for product-demo video, installed by the shadcn CLIS
• shadcn/ui · 64 copy-in React components on Radix + Tailwind, installed by CLIS
• shadcn/ui (GitHub) · Source monorepo for shadcn/ui: components, CLI, registry schema, skillsS
• Untitled UI · Figma UI kit plus React Aria + Tailwind v4 component library with an MCP serverS
• UX Patterns for Devs · 92 UX patterns with accessibility rules, an MCP server and llms.txtS
• 8bitcn/ui · Retro pixel-art restyle of shadcn/ui: 57 components and 44 blocksA
• Aceternity UI · 132 motion-heavy React sections; 329 registry items; 17 paid templatesA
• Ant Design · 73-component React library and design language for enterprise back-office appsA
• Appica UI · 70 React components on Base UI and Tailwind v4, with an llms.txt and markdown docsA
• Atlassian Design System · Atlaskit: 59 Apache-2.0 React components behind Jira, Confluence and BitbucketA
• beUI · 76 React motion components and AI agent UI, installed through a shadcn registryA
• beUI · 106-item Motion + Tailwind registry for React, shadcn-compatibleA
• Carbon Design System · IBM's open-source design system: 44 documented components across five frameworksA
• coss ui · Cal.com's Base UI + Tailwind v4 registry: 56 primitives and 500 particle variantsA
• Design System Checklist · 232-item open-source checklist for design language, foundations and componentsA
• Extend UI · shadcn registry of PDF, DOCX, XLSX and CSV viewers with bounding-box citationsA
• Flowbite · 56+ MIT Tailwind components with vanilla-JS behaviour, plus a paid 450+ block libraryA
• Fluent 2 · Microsoft's design system: 47 web components plus Windows, iOS and Android kitsA
• gluestack-ui · CLI-installed React Native component library built on NativeWind and Tailwind v4A
• HextaUI · 103 shadcn registry items: primitives plus AI, auth, billing, settings and team blocksA
• hue · Agent skill that turns any brand URL or screenshot into a design systemA
• HyperFrames Docs & Catalog · 515-page HyperFrames manual with a 375-block motion catalog and an llms.txt indexA
• HyperUI · 537 free MIT Tailwind blocks across application, marketing and neobrutalism setsA
• Kibo UI · shadcn registry of 41 hard components shadcn/ui does not ship, plus 28 blocksA
• Kinetics · 153 spring-physics micro-interactions with copy-paste CSS and ReactA
• OpenUI · MIT generative-UI framework: streaming UI language, component library, chat shellA
• Shadcn Space · 401+ shadcn blocks, 393+ component variants and 10 site templates, freemiumA
• shadcn-templ · shadcn/ui ported to Go and templ: 52 components, 27 blocks, its own CLIA
• Shadcn UI Blocks · 200+ free copy-paste marketing and app blocks built on shadcn/uiA
• Shark UI · 86 shadcn-style components built on Ark UI, installed through the shadcn CLIA
• Shopify Polaris · Shopify's admin design system, now shipped as framework-agnostic web componentsA
• SmoothUI · 130 animated React components including 33 text effects and 16 shader transitionsA
• Subframe · Visual editor that emits React + Tailwind + Radix code, with an MCP serverA
• Tamagui · Universal React styling engine, optimizing compiler and ~48 components for web and nativeA
• termcn · Terminal UI components for React, installed with the shadcn CLI, on Ink and OpenTUIA
• Thinking Orbs · React canvas loading orb with nine agent states, two sizes and automatic dark/lightA
• Thinking Orbs · React canvas loading orb with 9 named agent states and two sizesA
• Toolcraft · MIT React starter for canvas design tools, with agent docs baked inA
• Transitions.dev · 35 essential web-app transitions, packaged as an agent skillA
• Uiverse · Community archive of ~4,400 MIT-licensed CSS and Tailwind UI snippetsA
• AICSS · 14 copy-paste agent-chat components in React, Vue and Svelte with plain CSS, 9 freeB
• Amicro · CLI registry of 58 React motion components, mostly animated chartsB
• Appllama Loader Buttons · 25 named loading-button motion studies: 13 WebGL, 12 in SVG, Canvas and CSSB
• Beautiful UI · 20 MIT interaction patterns for agent UIs: thinking, streaming, approvals, diffsB
• Dot Matrix · 90 dot-matrix loading animations installed one at a time through a shadcn registryB
• hue (hueapp.io) · Landing site and live demo for the hue design-system skillB
• Luxe · 17 copy-paste React components on Radix and Tailwind v4, with its own CLIB
• MVPBlocks · 100+ copy-paste Next.js + Tailwind marketing and dashboard blocks, plus 7 templatesB
• MVPBlocks (source repo) · BSD-3 source for the MVPBlocks block library and its Next.js docs siteB
• nauvalazhar/ai · 48 owned-source React components for agentic AI apps, on Base UI + Tailwind v4B
• Park UI · 59 styled Ark UI components delivered by CLI, themed with Panda CSSB
• Primer · GitHub's design system: 62 React components, Octicons and design tokensB
• Reverse UI · 68 animated React components built on Framer Motion, sold as a lifetime licenceB
• Shoogle · Search engine across 277 shadcn registries, with an MCP and CLI namespaceB
• Soft Club UI · 118 Radix-based React components in a late-90s dark-glass aestheticB
• Spell UI · 33 animated React components — text reveals, WebGL backgrounds, embeds — via shadcn CLIB
• Spell UI (source repo) · MIT source for Spell UI: 33 React/Tailwind components served as a shadcn registryB
• Spell UI · 33 polished React + Tailwind components, MIT, shadcn-installableB
• Tailark · shadcn registry of marketing-site blocks, illustrations and brand logo SVGsB
• TailwindAdmin · shadcn/ui admin dashboard template in React, Next.js, Vue, Angular and TanStackB
• The Gridcn · Tron-styled shadcn registry: 140 items, six themes, HUD and 3D grid componentsB
• Untitled UI on GitHub · The MIT source repos behind Untitled UI: components, icons, and 3 starter kitsB
• useLayouts · 26 Motion-driven micro-interaction components installable via the shadcn CLIB
• WDS Shadcn Registry · Five shadcn components for async actions, loading states and hard form inputsB
• Pando (Pluralsight Design System) · Pluralsight's design system documented in zeroheight; public code frozen at v0.7.1C
• Shadix UI · 14 motion-heavy shadcn add-ons: signature pad, datetime picker, reorder listC