SixtyFPS GmbH, operating through their website slint.dev, is a software development company that specializes in creating modern user interfaces. Their primary product, Slint, is an open-source toolkit designed for building fluid, high-performance graphical user interfaces tailored for embedded devices and desktop applications. The toolkit is crafted to be easy to use, allowing developers to efficiently design and implement UIs using a blend of programming languages such as Rust, C++, and JavaScript. Recognized for its lightweight nature and fast performance, Slint focuses on delivering a seamless developer experience through features such as a reactive programming model and comprehensive documentation, making UI development more intuitive and faster. SixtyFPS GmbH is committed to innovation in the UI development space, providing developers and businesses with the tools to create visually appealing and responsive applications.