Question: Is there a tool that can summarize long documents and provide instant answers to my questions?

If you need a tool to summarize documents and give you answers to your questions on the fly, ChatDOC is worth a look. This AI-based information retrieval system can digest and summarize documents in PDF, DOC, EPUB and other formats. It can give you answers to questions, provide in-depth AI explanations and analyze images with the GPT-4 interface. The system can handle multi-document chats and can provide answers with citations. It's good for students, professionals and businesses looking for an information assistant.

Another good option is ChatPDF, which is geared specifically for PDFs. You can upload PDFs and ask questions, and the system will summarize answers and provide citations to the source documents. ChatPDF can handle multi-file chats and works in any language, so it's good for people who need quick answers to documents, whether students, researchers or professionals.

PDF GPT is another good option, with summarization, question answering, translation, citation, search and study questions. It's available in more than 90 languages and can handle books and research papers. PDF GPT offers a free version with some limitations and a Pro version for $6 a month, so it should be within reach of most people's needs and budgets.

If you want a more collaborative environment, ChatDox lets you ask questions of a wide variety of documents and multimedia sources. It can handle PDFs, DOCX, CSV files, YouTube videos, audio files and websites, and it's got features like custom categories, multilingual support and an application programming interface for integration. ChatDox is geared for students, researchers, teachers and professionals who want to quickly and easily extract information from a variety of sources.