v0 generates user interfaces from prompts. You describe a component, a page, or a small application, and it produces working React and Tailwind code that renders immediately — which you then refine by describing what should change rather than editing by hand. It is a prototyping tool that happens to produce code you can ship, and that combination is why it has stuck.

Its natural home is the React and Vercel ecosystem. If that is where you already work, the fit is close to frictionless: generated components use the libraries you already use, and deployment is a step rather than a project. Frontend developers use it to get past the empty file — a settings page, a pricing table, a dashboard shell — in minutes, then take over for the parts that need judgement.

The limits are where you would expect. It is a frontend and web tool: it will not design your database, reason about your infrastructure, or act as a full-stack autonomous engineer. Usage is credit-metered, with a free plan that includes a monthly allowance, so heavy iteration has a cost. And generated output is a draft — it looks right before it is right, and accessibility, edge cases, and integration with your real data layer still need engineering review.

A practical workflow: describe the whole component or page in one detailed prompt rather than building it up piece by piece, then refine with small, specific change requests. Vague instructions produce vague revisions, and it is faster to ask for one thing at a time than to correct three at once. Decide early whether you are prototyping or shipping: if the code is going into production, plan to review accessibility, responsive behaviour, and data wiring yourself, because generated markup is a starting point rather than a finished one.

Best for frontend developers who want to ship UI quickly in a React and Vercel workflow. Not for backend, infrastructure, or full-stack autonomous coding.