Google Stitch is an experimental AI-powered design tool from Google Labs that generates complete user interface designs and production-ready code for web and mobile applications. It processes natural language prompts or visual inputs (sketches, wireframes, screenshots) through sophisticated AI pipelines powered by Gemini models to create professional-grade UI designs. Users can customize elements including colors, fonts, spacing, and themes, then export designs to Figma or as clean HTML/CSS and React code. The December 2025 update introduced Gemini 3 integration with enhanced capabilities including interactive prototypes, predictive heatmaps for attention audits, and multi-screen project support.