v0 vs Bolt: two different bets about where the app runs

The architectural difference that matters

v0 generates code you take away. Its output is a component or a page, and its natural home is an existing Next.js project where you control the build.

Bolt runs a Node toolchain inside the browser via WebContainers, so the output is a live app with npm installs and a dev server. That is a different product: it replaces your setup rather than feeding it.

Who each one is for

v0 suits a frontend engineer who wants to skip the first hour of layout and styling. The value is measured in components accepted into a real repo.

Bolt suits prototyping: an idea that needs to be clickable today, with real dependencies, and no local environment. It is also a good fit for people who do not have Node installed and do not intend to.

The exit path

Ask what happens when the prototype becomes real. v0's output is already in the shape your repo wants. Bolt's output needs a real environment before it can be maintained, because a browser runtime is not where you run CI.

Neither is a substitute for version control and review. Both make it easy to generate a lot of code quickly, which raises the cost of the review you still owe.