Buildin.AI is a real-time collaboration platform that supports individual users for free and facilitates team collaboration. It integrates various features like notes, documents, and mind maps, and it supports web, mobile, Mac, and Windows clients. Users can write, plan, read, and organize information on a single platform, and they can publish their created content online to share with more people. Buildin.AI also offers an AI assistant that helps users organize information and enhances the speed of queries and reading.