Apple researchers unveiled SQUIRE, an experimental AI-powered interface prototyping tool, aiming to give developers unprecedented control over UI generation. Unlike typical AI coding tools that can feel unpredictable, SQUIRE acts as a visual companion, allowing developers to build UI trees step-by-step. Users start by describing goals and providing sample data, then iteratively fill UI slots with alternatives presented as clickable options, updating live previews and code instantly.

Crucially, OpenAI's GPT-4o powers the underlying model, translating the intermediate SquireIR representation into HTML, CSS, and JavaScript. This structure ensures targeted changes only affect specific UI parts, avoiding unintended global modifications and reducing trial-and-error loops. The system presents reasonable choices but leaves final control with the developer.