How to use v0: generate the UI, get real code

v0 is Vercel's AI builder: describe a UI or an app, and it writes real React and Next.js code you can preview, own, and deploy. Two things trip people up before they start, and both are here. It moved from v0.dev to v0.app, and it bills in credits metered on tokens, with a free tier capped at seven messages a day. This is the whole thing, first prompt to shipped, and what the credits actually buy.