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shadcn/ui vs Park UI vs Melt UI: Component Libraries in 2026

·PkgPulse Team
shadcnpark-uimelt-uicomponentsreactsveltetailwind2026

shadcn/ui isn't a package — it's a CLI that copies component source code directly into your project. Park UI builds on Ark UI's 45+ headless components across React, Vue, and Solid with Panda CSS styling. Melt UI provides Svelte-specific headless builder functions for maximum flexibility. Three tools, three philosophies, and almost no direct competition: they're designed for different frameworks and different levels of abstraction.

TL;DR

shadcn/ui for React and Next.js projects — the dominant component system in 2026 with 80K+ GitHub stars, owned components, and Tailwind CSS styling. Park UI for multi-framework projects (React, Vue, Solid) that want styled components with Panda CSS and theme customization. Melt UI for Svelte developers who want maximum control through a builder API. These three rarely compete directly — choose based on your framework first.

Key Takeaways

  • shadcn/ui: 80K+ GitHub stars, React/Next.js focused, Radix UI primitives + Tailwind CSS, copy-paste model
  • Park UI: GitHub 3K stars, React/Vue/Solid, built on Ark UI (45+ components) + Panda CSS, npm-installable
  • Melt UI: GitHub 4K stars, Svelte-only, headless builders, Svelte 5 runes support
  • shadcn/ui: No npm package — you own the code, full control, no version updates
  • Park UI: Ark UI v3 (2025 update), state machine-powered component logic via XState
  • Melt UI: Builder API returns properties to apply to any element — maximum flexibility
  • Bits UI: Higher-level wrapper around Melt UI for simpler Svelte component usage

Why "Headless" Components?

Traditional component libraries (MUI, Chakra) bundle styling with functionality. When your design doesn't match the library's defaults, you fight specificity wars and override CSS endlessly.

Headless libraries separate concerns:

  • Logic: Accessibility, keyboard navigation, ARIA attributes, state management
  • Styling: Your responsibility — bring Tailwind, CSS Modules, or anything else

This gives you perfect design control with battle-tested behavior underneath.

shadcn/ui

Package: Not a package — CLI-based installation GitHub stars: 80K+ Creator: shadcn (Shad CN) Built on: Radix UI + Tailwind CSS

shadcn/ui's model is unusual: instead of installing an npm package, you use a CLI to copy component source code into your project. You own every component, and you modify them as needed.

Installation

# Initialize shadcn/ui in your project
npx shadcn@latest init

# Add specific components
npx shadcn@latest add button
npx shadcn@latest add dialog
npx shadcn@latest add data-table

Running this creates files directly in your project:

src/
└── components/
    └── ui/
        ├── button.tsx    ← You own this file
        ├── dialog.tsx    ← You own this file
        └── data-table.tsx

Component Structure

// components/ui/button.tsx — this is YOUR file
import { Slot } from "@radix-ui/react-slot"
import { cva, type VariantProps } from "class-variance-authority"
import { cn } from "@/lib/utils"

const buttonVariants = cva(
  "inline-flex items-center justify-center rounded-md text-sm font-medium ...",
  {
    variants: {
      variant: {
        default: "bg-primary text-primary-foreground hover:bg-primary/90",
        outline: "border border-input bg-background hover:bg-accent",
        ghost: "hover:bg-accent hover:text-accent-foreground",
        destructive: "bg-destructive text-destructive-foreground hover:bg-destructive/90",
      },
      size: {
        default: "h-10 px-4 py-2",
        sm: "h-9 rounded-md px-3",
        lg: "h-11 rounded-md px-8",
        icon: "h-10 w-10",
      },
    },
    defaultVariants: { variant: "default", size: "default" },
  }
)

export interface ButtonProps extends ... {}

const Button = React.forwardRef<HTMLButtonElement, ButtonProps>(
  ({ className, variant, size, asChild = false, ...props }, ref) => {
    const Comp = asChild ? Slot : "button"
    return (
      <Comp
        className={cn(buttonVariants({ variant, size, className }))}
        ref={ref}
        {...props}
      />
    )
  }
)

Customization Model

// Extend the component directly (since you own the file):
const buttonVariants = cva("...", {
  variants: {
    variant: {
      // Add your custom variants:
      brand: "bg-brand-600 text-white hover:bg-brand-700",
      gradient: "bg-gradient-to-r from-purple-500 to-pink-500 text-white",
    },
    // ...
  }
})

No fighting with library CSS — you modify the source directly.

Theming

/* globals.css — CSS variables define the theme */
:root {
  --background: 0 0% 100%;
  --foreground: 222.2 47.4% 11.2%;
  --primary: 222.2 47.4% 11.2%;
  --primary-foreground: 210 40% 98%;
  --destructive: 0 100% 50%;
  /* ... */
}

.dark {
  --background: 224 71% 4%;
  --foreground: 213 31% 91%;
  /* ... */
}

shadcn/ui Strengths

  • 80K GitHub stars — enormous community, tutorials, customized components everywhere
  • Full ownership: no breaking library updates affecting your components
  • Excellent accessibility via Radix UI primitives underneath
  • Great with AI tools — Claude and Copilot know shadcn/ui deeply
  • New Registry CLI: share custom components via your own registry

shadcn/ui Limitations

  • React only (Next.js app is the primary target)
  • No version management — when shadcn adds improvements, you manually update your copies
  • Not a traditional npm package: npm audit, dependency graphs don't apply
  • The copy-paste model becomes unwieldy at scale (100+ custom components)

Park UI

Package: Components via npx, Ark UI via npm GitHub stars: 3K (Park UI), 5K (Ark UI) Creator: Christian Schröter (Park UI), Segun Adebayo (Ark UI/Chakra) Built on: Ark UI + Panda CSS

Park UI provides styled components for React, Vue, and Solid.js, built on top of Ark UI's headless component library. Ark UI handles the logic (state machines via XState, ARIA attributes, keyboard nav); Park UI handles the styling (via Panda CSS).

Installation

# For React
npx @park-ui/cli@latest add button

# For Vue
npx @park-ui/cli@latest add button --agent vue

# For Solid
npx @park-ui/cli@latest add button --agent solid

Like shadcn/ui, Park UI copies component code into your project. Unlike shadcn, it uses Panda CSS for styling.

Panda CSS Theming

// panda.config.ts
import { defineConfig } from "@pandacss/dev"

export default defineConfig({
  theme: {
    extend: {
      tokens: {
        colors: {
          brand: {
            50: { value: '#eff6ff' },
            500: { value: '#3b82f6' },
            900: { value: '#1e3a5f' },
          }
        }
      }
    }
  }
})

Ark UI Components (Headless Layer)

Park UI is built on Ark UI, which you can also use directly without Park UI's styling:

import { Combobox } from "@ark-ui/react"

// Use Ark UI's headless combobox directly
function MyCombobox() {
  return (
    <Combobox.Root>
      <Combobox.Label>Framework</Combobox.Label>
      <Combobox.Control>
        <Combobox.Input />
        <Combobox.Trigger>Open</Combobox.Trigger>
      </Combobox.Control>
      <Combobox.Positioner>
        <Combobox.Content>
          {items.map((item) => (
            <Combobox.Item key={item.value} item={item}>
              <Combobox.ItemText>{item.label}</Combobox.ItemText>
            </Combobox.Item>
          ))}
        </Combobox.Content>
      </Combobox.Positioner>
    </Combobox.Root>
  )
}

Ark UI v3 (2025) includes 45+ components: Combobox, DatePicker, Dialog, Menu, Popover, Select, Slider, Toast, Tooltip, and more — all state machine-powered via XState.

Park UI Strengths

  • Multi-framework: React, Vue, Solid — one design system, multiple frameworks
  • Ark UI's state machine logic is exceptionally robust for complex components
  • Theme editor: Visual UI for customizing colors, fonts, and radius
  • Chakra ecosystem backing (Segun Adebayo leads both Chakra and Ark)

Park UI Limitations

  • Panda CSS learning curve (different from Tailwind)
  • Smaller community than shadcn/ui
  • Less documentation and fewer tutorials
  • Panda CSS adds build tooling complexity

Melt UI

Package: @melt-ui/svelte GitHub stars: 4K Creator: Melt UI team (open-source community) Framework: Svelte only

Melt UI is the headless component library for Svelte. Unlike shadcn/ui and Park UI, it uses a builder pattern rather than a component model — functions that return properties to apply to any HTML element.

Installation

npm install @melt-ui/svelte

Builder Pattern

<!-- Melt UI builder pattern — apply properties to your own elements -->
<script lang="ts">
  import { createDialog, melt } from '@melt-ui/svelte';

  const {
    elements: { trigger, portalled, overlay, content, title, description, close },
    states: { open },
  } = createDialog({ role: 'dialog' });
</script>

<!-- Use melt() to apply builder properties to your elements -->
<button use:melt={$trigger}>Open Dialog</button>

<div use:melt={$portalled}>
  {#if $open}
    <div use:melt={$overlay} class="overlay" />
    <div use:melt={$content} class="dialog">
      <h2 use:melt={$title}>My Dialog</h2>
      <p use:melt={$description}>Dialog content here.</p>
      <button use:melt={$close}>Close</button>
    </div>
  {/if}
</div>

<style>
  /* Full CSS control — Melt provides no styles */
  .overlay { position: fixed; inset: 0; background: black/50; }
  .dialog { /* your design */ }
</style>

Svelte 5 Runes Support

Melt UI v0.77+ supports Svelte 5 runes:

<script lang="ts">
  import { createToggle, melt } from '@melt-ui/svelte';

  const {
    elements: { root },
    states: { pressed },
  } = createToggle();

  // Svelte 5: $state, $derived work alongside Melt UI
  let count = $state(0);
  let doubled = $derived(count * 2);
</script>

Bits UI (Higher-Level Melt UI)

If Melt UI's builder pattern is too low-level, Bits UI wraps it with a component API:

npm install bits-ui

<!-- Bits UI: component API built on Melt UI -->
<script>
  import { Dialog } from 'bits-ui';
</script>

<Dialog.Root>
  <Dialog.Trigger>Open</Dialog.Trigger>
  <Dialog.Portal>
    <Dialog.Overlay />
    <Dialog.Content>
      <Dialog.Title>My Dialog</Dialog.Title>
      <Dialog.Description>Content here.</Dialog.Description>
      <Dialog.Close>Close</Dialog.Close>
    </Dialog.Content>
  </Dialog.Portal>
</Dialog.Root>

Bits UI provides components with slots rather than builder functions — easier to use, less flexible than raw Melt UI.

Melt UI Strengths

  • Maximum flexibility: any HTML structure, any CSS approach
  • Excellent accessibility out of the box
  • Active Svelte 5 support
  • Builder pattern works with CSS Modules, Tailwind, or raw CSS

Melt UI Limitations

  • Svelte only — React teams can't use it
  • Builder pattern has a steeper learning curve than Bits UI or shadcn/ui
  • Smaller ecosystem than React alternatives

Framework Decision Matrix

LibraryReactVueSolidSvelte
shadcn/uiPrimaryNoNoNo
Park UI (Ark UI)YesYesYesLimited
Melt UINoNoNoPrimary
Bits UINoNoNoPrimary

Choosing Your Library

Use shadcn/ui if:

  • Your project is React / Next.js
  • Tailwind CSS is your styling approach
  • You want the largest ecosystem of community extensions
  • AI-generated code using shadcn/ui components is useful

Use Park UI / Ark UI if:

  • You need to support multiple frameworks (React + Vue for instance)
  • Panda CSS fits your design system approach
  • You need robust complex components (Combobox, DatePicker) backed by state machines

Use Melt UI if:

  • Your project is Svelte/SvelteKit
  • Maximum control over component structure is required
  • You're building a custom design system from scratch in Svelte

Use Bits UI if:

  • Svelte/SvelteKit project
  • You want a component API (not builder functions) over Melt UI's foundations
  • Shadcn-like DX in Svelte (shadcn-svelte also uses Bits UI under the hood)

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