# Beste UI > Beautiful, accessible blocks, pieces and components for shadcn/ui and Tailwind CSS, built for React and Next.js. Install one with the shadcn CLI and the code is yours to edit: no runtime dependency, nothing to upgrade. Markdown rendition of https://ui.beste.co/tools/cva-builder. Every page on the site has one: add `.md` to any address, or send `Accept: text/markdown`. Whole catalog for LLMs: https://ui.beste.co/llms.txt. Registry index: https://ui.beste.co/r/registry.json --- [tools](/tools)/[tailwind](/tools/category/tailwind) # CVA variant builder Write variants as one line each and get the cva() call, the defaults and the VariantProps type, in the shape shadcn components use. Component name Variants, one per linetxt0 Load sampleClear CVAts The result appears here Copy outputDownload [Made something you like?See it in real components](/components) ## Questions What is the input format?+ One rule per line. base: for the classes every instance carries, then group: option = classes for each variant, and default: group=option for the defaults. Anything else on its own line is treated as more base classes. Why CVA rather than a switch?+ Because the variants become a type. VariantProps reads the object back out, so the component's props are exactly the options you defined and a typo is a compile error rather than a missing class. How does this interact with cn()?+ CVA composes the classes, cn() resolves the conflicts when a caller passes their own. The usual shape is cn(buttonVariants({ variant, size }), className), and the merge playground shows what that does. ## Related tools [Tailwind class merge playgroundSee exactly what cn() keeps and what it throws away when a caller's className meets a component's own classes, with the losing classes listed.](/tools/tailwind-class-merge)[shadcn registry.json builderFill in a form and get a valid registry item and registry.json, with the file types inferred and the rules the shadcn CLI enforces checked as you type.](/tools/shadcn-registry)[CSS to TailwindTurn CSS declarations into Tailwind v4 utilities, with the spacing scale worked out and arbitrary values where there is no named class.](/tools/css-to-tailwind) Ship it · Ship it · Ship it · Ship it · Ship it · Ship it · Ship it · Ship it · Ship it · Ship it · Ship it · Ship it · Ship it · Ship it · Ship it · Ship it · ## The tools are free. So is most of the library. 1935 blocks and 989 pieces for shadcn/ui and Tailwind, built on the same tokens these tools write. Install one with a command and the code is yours. [Browse the blocksBrowse the blocks](/blocks) No signup for the tools. MIT for free blocks, commercial licence for Pro. ## Ship the interface, keep the code. New blocks, pieces and components every week. Install one with a command and it is yours to edit. No runtime dependency, no upgrade path to fight. [Browse the libraryBrowse the library](/blocks)[See pricingSee pricing](/pricing) ### Library * [Blocks](/blocks) * [Pages](/pages) * [Pieces](/pieces) * [Components](/components) * [Search](/search) ### Learn * [Docs](/docs) * [AI & MCP](/docs/mcp) * [Blog](/blog) * [Free tools](/tools) * [What's new?](/changelog) * [Website Builder](https://beste.co) ### More * [Pricing](/pricing) * [Referrals](/referrals) * [License](/license) * [GitHub](https://github.com/beste-co/beste-ui) ### Shadcn Blocks * [Shadcn Hero Blocks](/blocks/hero) * [Shadcn Feature Blocks](/blocks/feature) * [Shadcn Pricing Blocks](/blocks/pricing) * [Shadcn CTA Blocks](/blocks/cta) * [Shadcn FAQ Blocks](/blocks/faq) * [Shadcn About Blocks](/blocks/about) * [Shadcn Stats Blocks](/blocks/stats) * [Shadcn Footer Blocks](/blocks/footer) * [Shadcn Navigation Blocks](/blocks/navigation) * [Shadcn Auth Blocks](/blocks/auth) * [Shadcn Ecommerce Blocks](/blocks/ecommerce) * [Shadcn Portfolio Blocks](/blocks/portfolio) * [Shadcn Showcase Blocks](/blocks/showcase) * [Shadcn Careers Blocks](/blocks/careers) * [Shadcn Onboarding Blocks](/blocks/onboarding) * [Shadcn Coming Soon Blocks](/blocks/coming-soon) * [Shadcn Post Blocks](/blocks/post) * [Shadcn Legal Blocks](/blocks/legal) * [Shadcn Workflow Blocks](/blocks/workflow) * [Shadcn News Blocks](/blocks/news) © 2026, [Beste](https://beste.co). All rights reserved.