ChatHub is a browser extension that allows users to compare and contrast responses from multiple AI chatbots simultaneously. Users can engage with up to six chatbots at the same time, including ChatGPT, Gemini, and Claude, to get a range of insights and perspectives. The extension also offers features like real-time web access, full-text search of chat history, custom chatbot creation, and code preview, making it a versatile tool for content creation, research, and development tasks. ChatHub's lifetime deal offers a one-time purchase for unlimited access to all features and future updates.