The moment a vibe-coded mobile prototype gets its first real users, the structural cracks begin to show. The visual layout that compiled clean in the preview browser starts clipping on varied screen sizes, while the database connections and background queries that felt fast under zero load begin to lag. Taking a prototype to a real, maintainable product highlights the core divergence between Devin and VibeCode: one is a local developer's agent designed to interact with your local directory, while the other is a prompt-first pipeline compiled specifically for native mobile deployment.
Judging these tools on the transition from prototype to production exposes the fundamental division of code ownership. When bugs occur on 'Day Two' in a generated mobile app, a non-technical builder is forced to constantly re-prompt the AI to resolve layout issues or API errors. A developer, by contrast, wants a structured workspace where they can review diffs, run local scripts, and manage their own code repository rather than relying on a sealed generation loop.