Walles.AI is a free AI-powered browser extension that acts as your personal copilot while you browse. It supports GPT-4 and GPT-3.5, allowing you to ask complex questions, get immersive translations, and comprehend long texts directly in the sidebar. You can select any text to explain, translate, or paraphrase, and even upload PDFs for instant summaries and chat. It also summarizes YouTube videos and enhances Google search results. All chats and memos can be exported to Notion, making it a versatile.