Turning a prototype into a real product is less about generating screens and more about surviving the messy middle: schema changes, auth edge cases, regressions, deployment drift, and repeated fixes. Claude Code and Emergent genuinely diverge on that job because one assumes you will own a local repository in the terminal, while the other assumes you want a browser-hosted agent to scaffold and revise the whole app from prompts.
That makes this comparison useful because the failure modes show up fast once an app stops being a demo. If a tool is expensive to debug, weak at preserving structure, or awkward to exit once the codebase matters, those problems become the product risk, not just the tooling inconvenience.