Screenshot AI by Fabric is a product focused on generating efficient and effective user interface (UI) mockups for apps. It uses artificial intelligence to convert simple hand-drawn sketches or wireframes into actual usable UI designs digitally. The service allows developers, designers and even non-technical team members to generate quick prototypes or experiment with various different UI ideas without needing to write any code or use complex designing programs. It can transform the sketch to multiple themes, including light and dark modes, making it a versatile tool for app design and development.