Framer is a software tool for designing and prototyping interactive user interfaces (UI) for mobile and web applications. It is used by designers and developers to create high-fidelity mockups and prototypes of their UI designs, and to test and iterate on their ideas.Framer provides a range of features that make it easy for designers to create and test their UI designs, including a visual design interface, a library of UI components and animations, and integration with other design tools such as Sketch and Photoshop. It also offers collaboration and version control features that allow designers to work with their team members and clients in real-time.Framer is aimed at professional designers and developers, and is often used in the early stages of the design process to explore and validate design concepts and ideas. It is available as a paid subscription service, and is available for macOS and Windows.