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It's a split decision.
Choose 21st.dev when you want reusable React components, prompts and agent-based install paths inside an existing project. Choose v0 when you want to generate a working application from prompts, sync it with GitHub and deploy it to Vercel. 21st.dev’s paid library access starts at $8 monthly, or $6 per month billed annually. v0 has a free tier and paid plans starting at $30 per user monthly. They solve different parts of the build process.
01Side by side
| 21st.dev | v0 | |
|---|---|---|
| Pricing model | Subscriptions for library access and optional AI credits | Per-user subscriptions with included credits |
| Free tier | Two component copies daily; five Bug Bot reviews | Seven messages daily; Vercel deployment and GitHub sync |
| Limits and scaling | Unlimited installs on Builder; AI credits vary by plan | Paid plans include monthly and daily credits |
| API and SDKs | React and TypeScript components; MCP access | Prompt-built apps; integrations with tools and APIs |
| CLI and docs | CLI and MCP component search and installation | Web app workflow with GitHub sync |
| Integrations | Cursor, Claude Code, Windsurf, VS Code, other MCP clients | GitHub, Vercel, tools and APIs |
| Deployment model | Copies component source into your project | Publishes live websites; one-click Vercel deployment |
| Platforms | Web | Web and iOS |
21st.dev Choose 21st.dev if
- Choose 21st.dev if you need components for an existing React project.
- Choose 21st.dev if your coding workflow uses MCP or a terminal.
- Choose 21st.dev if you want library installs without an AI plan.
v0 Choose v0 if
- Choose v0 if you want prompts to generate working applications.
- Choose v0 if GitHub sync and Vercel deployment fit your stack.
- Choose v0 if you want visual editing or an iOS app.
02Pricing at real usage
21st.dev’s Free plan allows two component copies a day and five Design Bug Bot reviews. Builder is $8 monthly or $6 per month billed annually, with unlimited copies and installs. Builder + AI is $20 monthly or $15 per month billed annually; it includes 500, 1,000 or 2,000 AI credits a month, depending on the selected tier. Extra credits cost $5 per 100, and packs roll over month to month.
v0’s Free plan allows seven messages a day and includes Vercel deployment and GitHub sync. Plus costs $30 per user monthly and includes $30 monthly credits plus $2 daily login credits. Business is $100 per user monthly with the same listed credit amounts and training opt-out by default. Enterprise pricing is custom. The pricing page does not list a price for extra credits. At higher usage, compare 21st.dev’s credit tiers with v0’s included credits and model rates.
03API, SDKs and integration
21st.dev is a component library, not a hosted UI runtime. Its components follow React, TypeScript, Tailwind CSS and shadcn conventions. Developers can copy prompts for an AI coding agent or search and install components through its CLI and MCP. The listed MCP clients include Cursor, Claude Code, Windsurf and VS Code; the homepage also shows Codex and Lovable workflows. The library includes templates, themes, icons and shaders as well as components.
v0 is an AI app builder with a web interface and an iOS app. Developers describe the application they want, then can edit it visually, sync code to a GitHub repository and deploy to Vercel. Its homepage says it can build with tools and APIs through automatic integrations that require no accounts. That is an app-building workflow, rather than a component-install path. The homepage does not describe a public SDK or a programmable API for controlling v0, so teams evaluating it as a platform should ask about those interfaces and their limits.
04Open source, self-hosting and lock-in
Neither vendor publishes an open-source licence or self-hosting option for these products. 21st.dev’s workflow installs component source into a project, through its CLI or MCP paths, so the resulting code can be reviewed in the application repository. The vendor does not state the licence terms for individual library components in the product facts; check the component’s terms before adopting it in a commercial codebase.
v0 connects to GitHub and pushes code to a repository, and it can deploy applications to Vercel. That gives teams a repository-based path for working with generated code, but it does not establish how to export every part of a project or move deployment elsewhere. The pages do not describe a general data-export process for either product. Before committing to either workflow, verify component and generated-code rights, repository contents, and what happens to project data when an account is closed.
Questions people ask
What is v0.dev good for?
v0 is for generating working applications from prompts, editing them with visual controls, syncing code with GitHub and deploying websites to Vercel. Its Free plan includes seven messages a day, GitHub sync and Vercel deployment. It is a better fit for app creation than for installing individual components into an existing codebase.
What is 21st.dev used for?
21st.dev is a searchable library of UI components, templates, themes, icons and shaders. Developers can copy prompts for an AI coding agent or install component source through CLI and MCP workflows. Its components use React, TypeScript, Tailwind CSS and shadcn conventions.
Is 21st.dev good for an existing codebase?
It fits an existing project when you want to add UI source rather than generate a complete app. The library supports component installation through MCP and CLI, and its components follow React, TypeScript, Tailwind CSS and shadcn conventions. Review each component’s terms and code before using it.
How much does 21st.dev cost?
The Free plan costs nothing and allows two component copies daily. Builder costs $8 monthly or $6 per month billed annually. Builder + AI costs $20 monthly or $15 per month billed annually. The pricing page lists extra AI credits at $5 per 100, with packs rolling over month to month.