CrossUI Studio is a visual IDE for React and MUI (and shadcn/ui). Code and canvas stay in two-way sync on the same AST: edit code and the canvas updates live; click an element on the canvas, change a prop, and you get a one-line diff in the actual file-not a 200-line rewrite. The idea is simple: AI writes the logic, Studio tunes the UI. AI is great at architecture, data flow, and refactors, but bad at pixel-level UI tuning. Studio is the visual half-surgical, reviewable edits on your real code.