Stitch 2.0 by Google

The stitch.google.com domain itself was not directly retrievable, but official Google results identify Stitch as a Google AI design tool. Google describes Stitch as a product that generates user interfaces for mobile and web applications, accelerating design ideation and helping users move from ideas or prompts to UI concepts and frontend-ready outputs. In essence, the website represents Google's attempt to make interface design more conversational and faster through AI-native generation.