v0 by Vercel

v0 by Vercel generates React UI components from natural language prompts. You describe a component — a pricing table, a dashboard sidebar, a data table with filters — and v0 outputs clean JSX using shadcn/ui, Tailwind CSS, and TypeScript. The code is genuinely usable in Next.js projects without heavy rewriting. You can iterate by chatting and it updates the component live.

Best for frontend developers and full-stack engineers who want to skip the tedious part of building UI from scratch. If you're building a SaaS dashboard or landing page on Next.js, v0 can handle the component scaffolding so you focus on business logic. The shadcn/ui output means components fit into existing design systems without fighting the code.

Where it has limits: complex interactive behavior often needs manual completion. It won't build entire applications end-to-end — it's component-focused. The free tier gives 200 credits/month; heavy users hit limits fast. Also, the output assumes React/Next.js — not useful if you're on Vue, Svelte, or vanilla JS.