Free, open-source web tool for generating shadcn/ui themes with granular control over color variables.
Emphasizes accessibility by calculating and displaying contrast ratios for all color pairs.
Supports direct copy-paste output of CSS variables and theme configurations.
Includes a dashboard template for immediate preview and testing.
Created by darkseadev, focusing on simplicity with advanced customization options.
The shadcn/ui Theme Generator is a lightweight, user-friendly online tool built specifically for developers using shadcn/ui to create tailored color themes. Unlike basic generators, it provides enhanced control over individual color variables, allowing precise adjustments to elements like backgrounds, primaries, and accents while ensuring accessibility through real-time contrast ratio feedback. Ideal for React and Tailwind CSS projects, it streamlines theme creation for apps, dashboards, or sites by outputting ready-to-use CSS variables that integrate seamlessly with shadcn/ui's system. Hosted on Vercel for easy access, it's perfect for quick iterations or full rebrands, promoting inclusive design without compromising on aesthetics or performance.
Granular Color Control: Fine-tune variables for background, foreground, primary, secondary, accent, muted, card, popover, input, destructive, ring, and border with precise HSL or hex inputs.
Contrast Ratio Calculator: Automatically computes WCAG-compliant ratios for every pair (e.g., background vs. foreground), highlighting potential issues like low-contrast muted elements.
Real-Time Preview: Visual dashboard template shows how the theme applies to shadcn/ui components like buttons, cards, and inputs.
Export Options: Generates copy-paste CSS snippets for globals.css, including light/dark mode support via :root and .dark selectors.
Accessibility Built-In: Ensures themes meet AA/AAA standards by flagging ratios below 4.5:1, with suggestions for adjustments.
Simple Interface: No sign-ups or installs—input colors directly in the browser for instant results.
Enhanced Customization: More hands-on control over variables than one-click tools, enabling bespoke palettes without overhauls.
Accessibility-First: Contrast ratios make it easy to build inclusive UIs, saving time on external audits.
Free and Instant: No costs or barriers—generate unlimited themes on-demand, ideal for prototyping.
ShadCN-Optimized: Outputs match shadcn/ui's exact variable structure for zero-friction integration.
Lightweight Output: Clean, minimal code that's easy to version control and extend.
Manual Input Heavy: Requires tweaking individual colors, which might feel tedious for non-designers compared to AI-driven auto-generation.
Limited Automation: No gradient or multi-color batch inputs; focused on core variables rather than full-system themes.
Preview Scope: Dashboard template is great for basics but lacks extensive component variety for complex apps.
No Offline Mode: Browser-based only, so internet is needed—less ideal for disconnected workflows.
Early-Stage Polish: As an indie tool, documentation is sparse; relies on intuitive UI for guidance.
The generator delivers structured, shadcn/ui-ready outputs centered around a dashboard template for hands-on testing. Key elements include:
Color Pairs with Ratios: Background/Foreground (e.g., ratio 17.85), Primary/Primary FG (17.06), Secondary/Secondary FG (16.29), Accent/Accent FG (16.29), Muted/Muted FG (4.34), Card/Card FG (16.29), Popover/Popover FG (16.29), Destructive/Destr. FG, Input/Border, plus standalone Ring and Border vars.
CSS Variable Set: Full :root definitions like --background: 0 0% 100%; --foreground: 222.2 84% 4.9%; with .dark inversions for mode switching.
Dashboard Template: Interactive preview layout featuring themed buttons, cards, sheets, and inputs to validate the scheme.
Export Snippets: Tailwind config extensions and sample component code for immediate drop-in use.
Ratio Validation: Inline metrics for each pair, e.g., high-contrast primaries for readability and subtle muted tones for secondary elements.
Fully Free with no tiers, subscriptions, or limits. As an open-source tool by darkseadev, all features—including unlimited generations and exports—are available without restrictions. It aligns with shadcn/ui's ethos of accessible, no-cost development resources.
ShadCN UI: Plug variables directly into your project's CSS for component theming.
Tailwind CSS: Extend theme.extend.colors in config.js for class-based styling.
React/Next.js: Works with CSS modules or styled-components for app-wide propagation.
Vercel Deployment: Easy hosting if forking the repo for custom versions.
Design Handoff Tools: Export hex/HSL values to Figma or Sketch for team collaboration.
Accessibility Checkers: Complements tools like WAVE or Lighthouse for post-generation audits.
It's a free generator offering detailed control over shadcn/ui color variables, with built-in contrast checks—more manual but precise than auto-palette creators.
Yes, completely open-source under permissive licensing; use outputs freely in any app.
They measure readability auto-flagging issues like low-muted contrasts for quick fixes.
Simple theme generator with more control over color variable
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