Google Stitch's March 2026 'Vibe Design' update transforms it from a basic UI generator into a full-stack design-to-code platform. Key new features include Voice Canvas for conversational UI iteration, Autonomous Prototyping that generates logical screen flows, and MCP-based integration with coding agents and Firebase. A 4-step power workflow is outlined: start with business intent rather than grid layouts, use voice for micro-iterations, build interactive user journey flows by stitching screens together, and use a Figma-to-code pipeline for professional handoff. The tool is positioned as most powerful for founders and rapid MVP development, with the caveat that human product strategy is still essential.