The author spent 4 years building a UI design tool called Vecti, which is a collaborative UX design tool that allows for real-time editing and review of designs. Vecti is built with a high-performance rendering engine and has features such as reusable components, shared asset library, and presentation mode. The tool is designed to be intuitive and user-friendly, with a focus on performance, privacy, and creative freedom. Vecti offers a free plan and a professional plan with additional features.