Duo Gallery shows how real iOS apps adapt to iPhone Duo. Every screen is captured by hand on the device: closed, half-folded and open, in light and dark mode. No mockups, no renders. Filter by fold state, see which apps are actually optimized, and browse the half-folded layouts that only exist on the Duo. Includes screen sizes for designers and a free MCP server, so Claude, ChatGPT and Cursor can search the screens.